[459] | 1 | //#---------------------------------------------------------------------------
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| 2 | //# SDPol2.cc: Templated polarimetric functionality
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| 3 | //#---------------------------------------------------------------------------
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| 4 | //# Copyright (C) 2004
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| 5 | //# ATNF
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| 6 | //#
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| 7 | //# This program is free software; you can redistribute it and/or modify it
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| 8 | //# under the terms of the GNU General Public License as published by the Free
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| 9 | //# Software Foundation; either version 2 of the License, or (at your option)
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| 10 | //# any later version.
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| 11 | //#
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| 12 | //# This program is distributed in the hope that it will be useful, but
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| 13 | //# WITHOUT ANY WARRANTY; without even the implied warranty of
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| 14 | //# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
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| 15 | //# Public License for more details.
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| 16 | //#
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| 17 | //# You should have received a copy of the GNU General Public License along
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| 18 | //# with this program; if not, write to the Free Software Foundation, Inc.,
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| 19 | //# 675 Massachusetts Ave, Cambridge, MA 02139, USA.
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| 20 | //#
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| 21 | //# Correspondence concerning this software should be addressed as follows:
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| 22 | //# Internet email: Malte.Marquarding@csiro.au
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| 23 | //# Postal address: Malte Marquarding,
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| 24 | //# Australia Telescope National Facility,
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| 25 | //# P.O. Box 76,
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| 26 | //# Epping, NSW, 2121,
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| 27 | //# AUSTRALIA
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| 28 | //#
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| 29 | //# $Id:
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| 30 | //#---------------------------------------------------------------------------
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| 31 |
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| 32 | #include "SDPol.h"
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[833] | 33 | #include "STDefs.h"
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[459] | 34 |
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| 35 | #include <casa/Arrays/Array.h>
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| 36 | #include <casa/Arrays/ArrayMath.h>
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| 37 | #include <casa/Arrays/ArrayLogical.h>
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| 38 | #include <casa/BasicSL/String.h>
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| 39 | #include <casa/Utilities/Assert.h>
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| 40 | #include <casa/Utilities/DataType.h>
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| 41 | #include <casa/Utilities/Assert.h>
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| 42 |
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| 43 |
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| 44 | using namespace casa;
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| 45 | using namespace asap;
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| 46 |
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| 47 |
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| 48 | template <class T>
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| 49 | Array<T> SDPolUtil::stokesData (Array<T>& rawData, Bool doLinear)
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| 50 | //
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| 51 | // Generate data for each Stokes parameter from the
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| 52 | // raw flags. This is a lot of computational work and may
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| 53 | // not be worth the effort.
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| 54 | //
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| 55 | // Designed for use
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[469] | 56 | // Bool or uChar for mask
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[459] | 57 | // Float for TSys
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| 58 | //
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[469] | 59 | // Input arrays should be of shape
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| 60 | // [nBeam,nIF,nPol,nChan]
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| 61 | //
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[459] | 62 | {
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| 63 | T* t;
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| 64 | DataType type = whatType(t);
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[469] | 65 | AlwaysAssert(type==TpFloat || type==TpBool || type==TpUChar, AipsError);
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[459] | 66 | //
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| 67 | IPosition shapeIn = rawData.shape();
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[469] | 68 | const uInt nDim = shapeIn.nelements();
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| 69 | uInt polAxis = 0;
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| 70 | AlwaysAssert(nDim==asap::nAxes, AipsError);
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| 71 | //
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[459] | 72 | uInt nPol = shapeIn(asap::PolAxis);
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| 73 | Array<T> stokesData;
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| 74 | //
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| 75 | IPosition start(nDim,0);
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| 76 | IPosition end(shapeIn-1);
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| 77 | IPosition shapeOut = shapeIn;
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| 78 | //
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| 79 | if (doLinear) {
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| 80 | if (nPol==1) {
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| 81 | stokesData.resize(shapeOut);
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| 82 | stokesData = rawData;
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| 83 | } else if (nPol==2 || nPol==4) {
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| 84 |
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| 85 | // Set shape of output array
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| 86 |
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| 87 | if (nPol==2) {
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| 88 | shapeOut(asap::PolAxis) = 1;
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| 89 | } else {
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| 90 | shapeOut(asap::PolAxis) = 4;
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| 91 | }
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| 92 | stokesData.resize(shapeOut);
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| 93 |
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| 94 | // Get reference slices and assign/compute
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| 95 |
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| 96 | start(asap::PolAxis) = 0;
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| 97 | end(asap::PolAxis) = 0;
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| 98 | Array<T> M1In = rawData(start,end);
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| 99 | //
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| 100 | start(asap::PolAxis) = 1;
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| 101 | end(asap::PolAxis) = 1;
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| 102 | Array<T> M2In = rawData(start,end);
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| 103 | //
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| 104 | start(asap::PolAxis) = 0;
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| 105 | end(asap::PolAxis) = 0;
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| 106 | Array<T> M1Out = stokesData(start,end);
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| 107 | M1Out = SDPolUtil::andArrays (M1In, M2In); // I
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| 108 | //
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| 109 | if (nPol==4) {
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| 110 | start(asap::PolAxis) = 2;
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| 111 | end(asap::PolAxis) = 2;
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| 112 | Array<T> M3In = rawData(start,end);
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| 113 | //
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| 114 | start(asap::PolAxis) = 3;
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| 115 | end(asap::PolAxis) = 3;
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| 116 | Array<T> M4In = rawData(start,end);
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| 117 | //
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| 118 | start(asap::PolAxis) = 1;
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| 119 | end(asap::PolAxis) = 1;
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| 120 | Array<T> M2Out = stokesData(start,end);
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| 121 | M2Out = M1Out; // Q
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| 122 | //
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| 123 | start(asap::PolAxis) = 2;
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| 124 | end(asap::PolAxis) = 2;
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| 125 | Array<T> M3Out = stokesData(start,end);
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| 126 | M3Out = M3In; // U
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| 127 | //
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| 128 | start(asap::PolAxis) = 3;
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| 129 | end(asap::PolAxis) = 3;
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| 130 | Array<T> M4Out = stokesData(start,end);
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| 131 | M4Out = M4In; // V
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| 132 | }
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| 133 | } else {
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| 134 | throw(AipsError("Can only handle 1,2 or 4 polarizations"));
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| 135 | }
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| 136 | } else {
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| 137 | throw (AipsError("Only implemented for Linear polarizations"));
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| 138 | }
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| 139 | //
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| 140 | return stokesData;
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| 141 | }
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| 142 |
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[469] | 143 |
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| 144 |
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| 145 | template <class T>
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| 146 | Array<T> SDPolUtil::computeStokesDataForWriter (Array<T>& rawData, Bool doLinear)
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| 147 | //
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| 148 | // Generate data for each Stokes parameter from the
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| 149 | // raw flags. This is a lot of computational work and may
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| 150 | // not be worth the effort. This function is specifically
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| 151 | // for the SDWriter
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| 152 | //
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| 153 | // Designed for use
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| 154 | // Bool or uChar for mask
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| 155 | // Float for TSys
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| 156 | //
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| 157 | // Input arrays should be of shape
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| 158 | // [nChan,nPol] Bool/uChar
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| 159 | // [nPol] Float
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| 160 | //
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| 161 | {
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| 162 | T* t;
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| 163 | DataType type = whatType(t);
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| 164 | AlwaysAssert(type==TpFloat || type==TpBool || type==TpUChar, AipsError);
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| 165 | //
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| 166 | IPosition shapeIn = rawData.shape();
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| 167 | const uInt nDim = shapeIn.nelements();
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| 168 | uInt polAxis = 0;
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| 169 | if (type==TpFloat) {
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| 170 | AlwaysAssert(nDim==1,AipsError);
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| 171 | } else {
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| 172 | AlwaysAssert(nDim==2,AipsError);
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| 173 | polAxis = 1;
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| 174 | }
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| 175 | //
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| 176 | uInt nPol = shapeIn(polAxis);
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| 177 | Array<T> stokesData;
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| 178 | //
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| 179 | IPosition start(nDim,0);
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| 180 | IPosition end(shapeIn-1);
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| 181 | IPosition shapeOut = shapeIn;
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| 182 | //
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| 183 | if (doLinear) {
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| 184 | if (nPol==1) {
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| 185 | stokesData.resize(shapeOut);
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| 186 | stokesData = rawData;
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| 187 | } else if (nPol==2 || nPol==4) {
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| 188 |
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| 189 | // Set shape of output array
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| 190 |
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| 191 | if (nPol==2) {
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| 192 | shapeOut(polAxis) = 1;
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| 193 | } else {
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| 194 | shapeOut(polAxis) = 4;
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| 195 | }
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| 196 | stokesData.resize(shapeOut);
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| 197 |
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| 198 | // Get reference slices and assign/compute
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| 199 |
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| 200 | start(polAxis) = 0;
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| 201 | end(polAxis) = 0;
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| 202 | Array<T> M1In = rawData(start,end);
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| 203 | //
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| 204 | start(polAxis) = 1;
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| 205 | end(polAxis) = 1;
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| 206 | Array<T> M2In = rawData(start,end);
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| 207 | //
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| 208 | start(polAxis) = 0;
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| 209 | end(polAxis) = 0;
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| 210 | Array<T> M1Out = stokesData(start,end);
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| 211 | M1Out = SDPolUtil::andArrays (M1In, M2In); // I
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| 212 | //
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| 213 | if (nPol==4) {
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| 214 | start(polAxis) = 2;
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| 215 | end(polAxis) = 2;
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| 216 | Array<T> M3In = rawData(start,end);
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| 217 | //
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| 218 | start(polAxis) = 3;
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| 219 | end(polAxis) = 3;
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| 220 | Array<T> M4In = rawData(start,end);
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| 221 | //
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| 222 | start(polAxis) = 1;
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| 223 | end(polAxis) = 1;
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| 224 | Array<T> M2Out = stokesData(start,end);
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| 225 | M2Out = M1Out; // Q
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| 226 | //
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| 227 | start(polAxis) = 2;
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| 228 | end(polAxis) = 2;
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| 229 | Array<T> M3Out = stokesData(start,end);
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| 230 | M3Out = M3In; // U
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| 231 | //
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| 232 | start(polAxis) = 3;
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| 233 | end(polAxis) = 3;
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| 234 | Array<T> M4Out = stokesData(start,end);
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| 235 | M4Out = M4In; // V
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| 236 | }
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| 237 | } else {
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| 238 | throw(AipsError("Can only handle 1,2 or 4 polarizations"));
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| 239 | }
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| 240 | } else {
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| 241 | throw (AipsError("Only implemented for Linear polarizations"));
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| 242 | }
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| 243 | //
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| 244 | return stokesData;
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| 245 | }
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| 246 |
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| 247 |
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