1 | #include <stdio.h> |
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2 | #include <stdlib.h> |
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3 | #include <cpgplot.h> |
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4 | #include <math.h> |
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5 | #include <string.h> |
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6 | #include <ctype.h> |
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7 | |
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8 | #define WDGPIX 100 /* used by cpgwedglog |
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9 | --> number of increments in the wedge. */ |
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10 | |
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11 | /** |
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12 | * This file contains the following programs, all in C code: |
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13 | * |
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14 | * int cpgtest() --> a front-end to cpgqinf, to test whether a pgplot |
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15 | * device is currently open. |
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16 | * void cpgwedglog(const char* side, float disp, float width, |
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17 | * float fg, float bg, const char *label) |
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18 | * --> a C-code version of pgwedg, plotting the wedge |
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19 | * scale in logarithmic units. |
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20 | * void cpgcumul(int npts, float *data, float datamin, float datamax, |
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21 | * int pgflag) |
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22 | * --> a new pgplot routine that draws a cumulative |
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23 | * distribution. Uses _swap and _sort. |
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24 | * void cpghistlog(npts, data, datamin, datamax, nbin, pgflag) |
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25 | * --> as for cpghist, with the y-axis on a logarithmic scale. |
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26 | * |
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27 | */ |
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28 | |
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29 | |
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30 | /********************************************************************/ |
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31 | /* CPGTEST |
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32 | /********************************************************************/ |
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33 | |
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34 | int cpgtest() |
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35 | { |
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36 | /** |
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37 | * cpgtest |
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38 | * A front-end to cpgqinf, to test whether a pgplot device is |
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39 | * currently open. Returns 1 if there is, else 0. |
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40 | */ |
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41 | char answer[10]; /* The PGQINF return string */ |
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42 | int answer_len = sizeof(answer); /* allocated size of answer[] */ |
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43 | cpgqinf("STATE", answer, &answer_len); |
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44 | return strcmp(answer, "OPEN") == 0; |
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45 | } |
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46 | |
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47 | /********************************************************************/ |
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48 | /* CPGWEDGLOG |
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49 | /********************************************************************/ |
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50 | |
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51 | void cpgwedglog(const char* side, float disp, float width, float fg, float bg, |
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52 | const char *label) |
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53 | { |
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54 | /** |
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55 | * cpgwedglog |
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56 | * A C-code version of PGWEDG that writes the scale of the wedge in |
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57 | * logarithmic coordinates. All parameters are exactly as for cpgwedg. |
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58 | */ |
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59 | |
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60 | float wxa,wxb,wya,wyb, xa,xb,ya,yb; /* Temporary window coord storage.*/ |
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61 | float vxa,vxb,vya,vyb; /* Viewport coords of wedge. */ |
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62 | float oldch, newch; /* Original and annotation character |
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63 | heights. */ |
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64 | float ndcsiz; /* Size of unit character height |
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65 | (NDC units). */ |
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66 | int horiz; /* Logical: True (=1) if wedge plotted |
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67 | horizontally. */ |
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68 | int image; /* Logical: Use PGIMAG (T=1) or |
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69 | PGGRAY (F=0). */ |
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70 | |
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71 | int nside,i; /* nside = symbolic version of side. */ |
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72 | const int bot=1,top=2,lft=3,rgt=4; |
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73 | float wedwid, wdginc, vwidth, vdisp, xch, ych, labwid, fg1, bg1; |
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74 | float txtfrc=0.6; /* Set the fraction of WIDTH used |
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75 | for anotation. */ |
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76 | float txtsep=2.2; /* Char separation between numbers |
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77 | and LABEL. */ |
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78 | float wdgarr[WDGPIX]; /* Array to draw wedge in. */ |
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79 | float tr[6] = {0.0,1.0,0.0,0.0,0.0,1.0}; |
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80 | |
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81 | /* if(pgnoto("pgwedg")) return; */ |
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82 | |
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83 | /* Get a numeric version of SIDE. */ |
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84 | if(tolower(side[0])=='b'){ |
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85 | nside = bot; |
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86 | horiz = 1; |
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87 | } |
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88 | else if(tolower(side[0]=='t')){ |
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89 | nside = top; |
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90 | horiz = 1; |
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91 | } |
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92 | else if(tolower(side[0]=='l')){ |
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93 | nside = lft; |
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94 | horiz = 0; |
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95 | } |
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96 | else if(tolower(side[0]=='r')){ |
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97 | nside = rgt; |
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98 | horiz = 0; |
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99 | } |
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100 | /* else gwarn("Invalid \"SIDE\" argument in PGWEDG."); */ |
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101 | else fprintf(stdout,"%PGPLOT, Invalid \"SIDE\" argument in CPGWEDGLOG."); |
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102 | |
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103 | /* Determine which routine to use. */ |
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104 | if(strlen(side)<2) image = 0; |
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105 | else if(tolower(side[1])=='i') image = 1; |
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106 | else if(tolower(side[1])=='g') image = 0; |
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107 | else fprintf(stdout,"%PGPLOT, Invalid \"SIDE\" argument in CPGWEDGLOG."); |
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108 | |
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109 | cpgbbuf(); |
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110 | |
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111 | /* Store the current world and viewport coords and the character height. */ |
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112 | cpgqwin(&wxa, &wxb, &wya, &wyb); |
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113 | cpgqvp(0, &xa, &xb, &ya, &yb); |
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114 | cpgqch(&oldch); |
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115 | |
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116 | /* Determine the unit character height in NDC coords. */ |
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117 | cpgsch(1.0); |
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118 | cpgqcs(0, &xch, &ych); |
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119 | if(horiz == 1) ndcsiz = ych; |
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120 | else ndcsiz = xch; |
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121 | |
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122 | /* Convert 'WIDTH' and 'DISP' into viewport units. */ |
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123 | vwidth = width * ndcsiz * oldch; |
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124 | vdisp = disp * ndcsiz * oldch; |
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125 | |
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126 | /* Determine the number of character heights required under the wedge. */ |
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127 | labwid = txtsep; |
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128 | if(strcmp(label," ")!=0) labwid = labwid + 1.0; |
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129 | |
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130 | /* Determine and set the character height required to fit the wedge |
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131 | anotation text within the area allowed for it. */ |
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132 | newch = txtfrc*vwidth / (labwid*ndcsiz); |
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133 | cpgsch(newch); |
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134 | |
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135 | /* Determine the width of the wedge part of the plot minus the anotation. |
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136 | (NDC units). */ |
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137 | wedwid = vwidth * (1.0-txtfrc); |
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138 | |
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139 | /* Use these to determine viewport coordinates for the wedge + annotation.*/ |
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140 | vxa = xa; |
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141 | vxb = xb; |
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142 | vya = ya; |
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143 | vyb = yb; |
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144 | if(nside==bot){ |
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145 | vyb = ya - vdisp; |
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146 | vya = vyb - wedwid; |
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147 | } |
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148 | else if(nside==top) { |
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149 | vya = yb + vdisp; |
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150 | vyb = vya + wedwid; |
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151 | } |
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152 | else if(nside==lft) { |
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153 | vxb = xa - vdisp; |
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154 | vxa = vxb - wedwid; |
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155 | } |
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156 | else if(nside==rgt) { |
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157 | vxa = xb + vdisp; |
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158 | vxb = vxa + wedwid; |
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159 | } |
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160 | |
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161 | /* Set the viewport for the wedge. */ |
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162 | cpgsvp(vxa, vxb, vya, vyb); |
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163 | |
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164 | /* Swap FG/BG if necessary to get axis direction right. */ |
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165 | /* fg1 = max(fg,bg); */ |
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166 | /* bg1 = min(fg,bg); */ |
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167 | if(fg>bg) { |
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168 | fg1 = fg; |
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169 | bg1 = bg; |
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170 | } |
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171 | else { |
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172 | fg1 = bg; |
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173 | bg1 = fg; |
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174 | } |
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175 | |
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176 | |
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177 | /* Create a dummy wedge array to be plotted. */ |
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178 | wdginc = (fg1-bg1)/(WDGPIX-1); |
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179 | for(i=0;i<WDGPIX;i++) wdgarr[i] = bg1 + (i-1) * wdginc; |
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180 | |
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181 | /* Draw the wedge then change the world coordinates for labelling. */ |
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182 | if (horiz==1) { |
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183 | cpgswin(1.0, (float)WDGPIX, 0.9, 1.1); |
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184 | if (image==1) cpgimag(wdgarr, WDGPIX,1, 1,WDGPIX, 1,1, fg,bg, tr); |
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185 | else cpggray(wdgarr, WDGPIX,1, 1,WDGPIX, 1,1, fg,bg, tr); |
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186 | cpgswin(bg1,fg1,0.0,1.0); |
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187 | } |
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188 | else{ |
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189 | cpgswin(0.9, 1.1, 1.0, (float)WDGPIX); |
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190 | if (image==1) cpgimag(wdgarr, 1,WDGPIX, 1,1, 1,WDGPIX, fg,bg, tr); |
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191 | else cpggray(wdgarr, 1,WDGPIX, 1,1, 1,WDGPIX, fg,bg, tr); |
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192 | cpgswin(0.0, 1.0, bg1, fg1); |
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193 | } |
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194 | |
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195 | /* Draw a labelled frame around the wedge -- using a logarithmic scale! */ |
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196 | if(nside==bot) cpgbox("BCNSTL",0.0,0,"BC",0.0,0); |
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197 | else if(nside==top) cpgbox("BCMSTL",0.0,0,"BC",0.0,0); |
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198 | else if(nside==lft) cpgbox("BC",0.0,0,"BCNSTL",0.0,0); |
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199 | else if(nside==rgt) cpgbox("BC",0.0,0,"BCMSTL",0.0,0); |
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200 | |
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201 | /* Write the units label. */ |
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202 | if((strcmp(label," ")!=0)) cpgmtxt(side,txtsep,1.0,1.0,label); |
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203 | |
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204 | /* Reset the original viewport and world coordinates. */ |
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205 | cpgsvp(xa,xb,ya,yb); |
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206 | cpgswin(wxa,wxb,wya,wyb); |
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207 | cpgsch(oldch); |
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208 | cpgebuf(); |
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209 | |
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210 | } |
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211 | |
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212 | |
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213 | /********************************************************************/ |
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214 | /* CPGCUMUL |
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215 | /********************************************************************/ |
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216 | |
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217 | void _swap(float *a, float *b) |
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218 | { |
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219 | float t; |
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220 | t=*a; *a=*b; *b=t; |
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221 | } |
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222 | |
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223 | void _sort(float *array, int begin, int end) |
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224 | { |
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225 | float pivot = array[begin]; |
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226 | int i = begin + 1, j = end, k = end; |
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227 | float t; |
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228 | |
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229 | while (i < j) { |
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230 | if (array[i] < pivot) i++; |
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231 | else if (array[i] > pivot) { |
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232 | j--; k--; |
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233 | t = array[i]; |
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234 | array[i] = array[j]; |
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235 | array[j] = array[k]; |
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236 | array[k] = t; } |
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237 | else { |
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238 | j--; |
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239 | _swap(&array[i], &array[j]); |
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240 | } } |
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241 | i--; |
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242 | _swap(&array[begin], &array[i]); |
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243 | if (i - begin > 1) |
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244 | _sort(array, begin, i); |
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245 | if (end - k > 1) |
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246 | _sort(array, k, end); |
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247 | } |
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248 | |
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249 | |
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250 | void cpgcumul(int npts, float *data, float datamin, float datamax, int pgflag) |
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251 | { |
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252 | /** |
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253 | * cpgcumul(npts, data, datamin, datamax, pgflag) |
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254 | * A new pgplot routine that draws a cumulative distribution. |
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255 | * The use of pgflag is similar to cpghist & cpghist_log: |
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256 | * 0 --> draw a new graph using cpgenv, going from 0 to 1 on the y-axis. |
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257 | * 2 --> draw the plot on the current graph, without re-drawing any axes. |
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258 | */ |
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259 | |
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260 | int i; |
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261 | float *sorted; |
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262 | float MINCOUNT=0.; |
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263 | |
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264 | sorted = (float *)calloc(npts,sizeof(float)); |
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265 | for(i=0;i<npts;i++) sorted[i] = data[i]; |
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266 | _sort(sorted,0,npts); |
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267 | |
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268 | cpgbbuf(); |
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269 | |
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270 | /* DEFINE ENVIRONMENT IF NECESSARY */ |
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271 | if(pgflag == 0) cpgenv(datamin,datamax,MINCOUNT,1.0001,0,0); |
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272 | if(pgflag == 2) cpgswin(datamin,datamax,MINCOUNT,1.); |
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273 | |
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274 | /* DRAW LINE */ |
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275 | cpgmove(datamin,MINCOUNT); |
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276 | for(i=0;i<npts;i++) cpgdraw(sorted[i],(float)(i+1)/(float)(npts)); |
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277 | cpgdraw(datamax,1.); |
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278 | |
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279 | cpgebuf(); |
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280 | |
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281 | free(sorted); |
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282 | |
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283 | } |
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284 | |
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285 | /********************************************************************/ |
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286 | /* CPGHISTLOG |
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287 | /********************************************************************/ |
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288 | |
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289 | void cpghistlog(int npts, float *data, float datamin, float datamax, int nbin, |
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290 | int pgflag) |
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291 | { |
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292 | /** |
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293 | * cpghistlog(npts, data, datamin, datamax, nbin, pgflag) |
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294 | * |
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295 | * Works exactly as for cpghist, except the y-axis is a logarithmic scale. |
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296 | * |
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297 | */ |
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298 | |
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299 | |
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300 | int i,bin; |
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301 | float *num; |
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302 | float maxNum,binSize,x1,x2,y1,y2,older,newer,fraction; |
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303 | float MINCOUNT=-0.2; |
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304 | |
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305 | num = (float *)calloc(nbin,sizeof(float)); |
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306 | |
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307 | cpgbbuf(); |
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308 | |
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309 | /* HOW MANY VALUES IN EACH BIN? */ |
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310 | for(i=0; i<npts; i++){ |
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311 | fraction = (data[i] - datamin) / (datamax - datamin); |
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312 | bin = (int)( floor(fraction*nbin) ); |
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313 | if((bin>=0)&&(bin<nbin)) num[bin]+=1.; |
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314 | } |
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315 | for(i=0; i<nbin;i++){ |
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316 | if(num[i]>0) num[i] = log10(num[i]); |
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317 | else num[i] = MINCOUNT; |
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318 | } |
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319 | maxNum = num[0]; |
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320 | for(i=1; i<nbin; i++) if(num[i]>maxNum) maxNum = num[i]; |
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321 | binSize = (datamax - datamin) / (float)nbin; |
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322 | |
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323 | /* BOUNDARIES OF PLOT */ |
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324 | x1 = datamin; |
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325 | x2 = datamax; |
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326 | y1 = MINCOUNT; |
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327 | y2 = ceil(maxNum); |
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328 | |
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329 | /* DEFINE ENVIRONMENT IF NECESSARY */ |
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330 | if(pgflag%2 == 0) cpgenv(x1,x2,y1,y2,0,20); |
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331 | |
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332 | /* DRAW HISTOGRAM */ |
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333 | if(pgflag/2 == 0){ |
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334 | older = 0.; |
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335 | x2 = datamin; |
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336 | cpgmove(datamin,MINCOUNT); |
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337 | for(i=0;i<nbin;i++){ |
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338 | newer = num[i]; |
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339 | x1 = x2; |
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340 | x2 = datamin + i*binSize; |
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341 | if(newer!=MINCOUNT){ |
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342 | if(newer<=older){ |
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343 | cpgmove(x1,newer); |
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344 | cpgdraw(x2,newer); |
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345 | } |
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346 | else{ |
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347 | cpgmove(x1,older); |
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348 | cpgdraw(x1,newer); |
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349 | cpgdraw(x2,newer); |
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350 | } |
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351 | } |
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352 | cpgdraw(x2,MINCOUNT); |
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353 | older=newer; |
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354 | } |
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355 | } |
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356 | else if(pgflag/2 == 1){ |
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357 | older = MINCOUNT; |
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358 | x2 = datamin; |
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359 | for(i=0;i<nbin;i++){ |
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360 | newer = num[i]; |
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361 | x1 = x2; |
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362 | x2 = datamin + i*binSize; |
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363 | if(newer!=MINCOUNT) cpgrect(x1,x2,0.,newer); |
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364 | } |
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365 | } |
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366 | else if(pgflag/2 == 2){ |
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367 | older = 0.; |
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368 | cpgmove(datamin,MINCOUNT); |
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369 | x2 = datamin; |
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370 | for(i=0;i<nbin;i++){ |
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371 | newer = num[i]; |
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372 | x1 = x2; |
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373 | x2 = datamin + i*binSize; |
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374 | if((newer==MINCOUNT)&&(older==MINCOUNT)) cpgmove(x2,MINCOUNT); |
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375 | else { |
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376 | cpgdraw(x1,newer); |
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377 | if(newer==MINCOUNT) cpgmove(x2,newer); |
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378 | else cpgdraw(x2,newer); |
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379 | } |
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380 | older = newer; |
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381 | } |
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382 | } |
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383 | |
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384 | cpgebuf(); |
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385 | |
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386 | } |
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387 | |
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