[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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| 33 | #include "SDDefs.h" |
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| 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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| 56 | // Bool for mask |
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| 57 | // Float for TSys |
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| 58 | // |
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| 59 | { |
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| 60 | T* t; |
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| 61 | DataType type = whatType(t); |
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| 62 | AlwaysAssert(type==TpFloat || type==TpBool, AipsError); |
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| 63 | // |
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| 64 | IPosition shapeIn = rawData.shape(); |
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| 65 | uInt nPol = shapeIn(asap::PolAxis); |
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| 66 | const uInt nDim = shapeIn.nelements(); |
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| 67 | Array<T> stokesData; |
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| 68 | // |
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| 69 | IPosition start(nDim,0); |
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| 70 | IPosition end(shapeIn-1); |
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| 71 | IPosition shapeOut = shapeIn; |
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| 72 | // |
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| 73 | if (doLinear) { |
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| 74 | if (nPol==1) { |
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| 75 | stokesData.resize(shapeOut); |
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| 76 | stokesData = rawData; |
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| 77 | } else if (nPol==2 || nPol==4) { |
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| 78 | |
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| 79 | // Set shape of output array |
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| 80 | |
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| 81 | if (nPol==2) { |
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| 82 | shapeOut(asap::PolAxis) = 1; |
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| 83 | } else { |
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| 84 | shapeOut(asap::PolAxis) = 4; |
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| 85 | } |
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| 86 | stokesData.resize(shapeOut); |
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| 87 | |
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| 88 | // Get reference slices and assign/compute |
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| 89 | |
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| 90 | start(asap::PolAxis) = 0; |
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| 91 | end(asap::PolAxis) = 0; |
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| 92 | Array<T> M1In = rawData(start,end); |
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| 93 | // |
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| 94 | start(asap::PolAxis) = 1; |
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| 95 | end(asap::PolAxis) = 1; |
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| 96 | Array<T> M2In = rawData(start,end); |
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| 97 | // |
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| 98 | start(asap::PolAxis) = 0; |
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| 99 | end(asap::PolAxis) = 0; |
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| 100 | Array<T> M1Out = stokesData(start,end); |
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| 101 | M1Out = SDPolUtil::andArrays (M1In, M2In); // I |
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| 102 | // |
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| 103 | if (nPol==4) { |
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| 104 | start(asap::PolAxis) = 2; |
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| 105 | end(asap::PolAxis) = 2; |
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| 106 | Array<T> M3In = rawData(start,end); |
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| 107 | // |
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| 108 | start(asap::PolAxis) = 3; |
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| 109 | end(asap::PolAxis) = 3; |
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| 110 | Array<T> M4In = rawData(start,end); |
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| 111 | // |
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| 112 | start(asap::PolAxis) = 1; |
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| 113 | end(asap::PolAxis) = 1; |
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| 114 | Array<T> M2Out = stokesData(start,end); |
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| 115 | M2Out = M1Out; // Q |
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| 116 | // |
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| 117 | start(asap::PolAxis) = 2; |
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| 118 | end(asap::PolAxis) = 2; |
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| 119 | Array<T> M3Out = stokesData(start,end); |
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| 120 | M3Out = M3In; // U |
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| 121 | // |
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| 122 | start(asap::PolAxis) = 3; |
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| 123 | end(asap::PolAxis) = 3; |
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| 124 | Array<T> M4Out = stokesData(start,end); |
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| 125 | M4Out = M4In; // V |
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| 126 | } |
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| 127 | } else { |
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| 128 | throw(AipsError("Can only handle 1,2 or 4 polarizations")); |
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| 129 | } |
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| 130 | } else { |
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| 131 | throw (AipsError("Only implemented for Linear polarizations")); |
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| 132 | } |
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| 133 | // |
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| 134 | return stokesData; |
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| 135 | } |
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| 136 | |
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