[910] | 1 | // |
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| 2 | // C++ Implementation: STPolStokes |
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| 3 | // |
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| 4 | // Description: |
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| 5 | // |
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| 6 | // |
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| 7 | // Author: Malte Marquarding <Malte.Marquarding@csiro.au>, (C) 2006 |
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| 8 | // |
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| 9 | // Copyright: See COPYING file that comes with this distribution |
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| 10 | // |
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| 11 | // |
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| 12 | |
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| 13 | #include <casa/Arrays/ArrayMath.h> |
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| 14 | #include <casa/BasicMath/Math.h> |
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| 15 | #include <casa/Exceptions/Error.h> |
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| 16 | #include <casa/BasicSL/Constants.h> |
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| 17 | #include "STPolStokes.h" |
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| 18 | |
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| 19 | using namespace casa; |
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| 20 | |
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| 21 | namespace asap { |
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| 22 | |
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| 23 | Factory<STPol,STPolStokes> STPolStokes::myFactory; |
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| 24 | |
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| 25 | STPolStokes::~STPolStokes() |
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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 | Vector<Float> asap::STPolStokes::getStokes( uint index ) |
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| 31 | { |
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| 32 | return getSpectrum(index); |
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| 33 | } |
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| 34 | |
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| 35 | Vector<Float> asap::STPolStokes::getLinPol( uInt index ) |
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| 36 | { |
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| 37 | if ( index < 0 || index >4 ) throw(AipsError("LinPol index out of range")); |
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| 38 | Vector<Float> out; |
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| 39 | if ( nspec() == 4) { |
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| 40 | switch(index) { |
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| 41 | case 1: |
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| 42 | out = Vector<Float>(sqrt(pow(getSpectrum(1),Float(2.0)) |
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| 43 | +pow(getSpectrum(2), Float(2.0)))); |
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| 44 | break; |
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| 45 | case 2: |
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| 46 | out = Vector<Float>(Float(180.0/C::pi/2.0) |
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| 47 | * atan2(getSpectrum(2),getSpectrum(1))); |
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| 48 | break; |
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| 49 | default: |
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| 50 | out = getSpectrum(index); |
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| 51 | } |
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| 52 | } |
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| 53 | return out; |
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| 54 | } |
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| 55 | |
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| 56 | Vector<Float> asap::STPolStokes::getLinear(uInt index ) |
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| 57 | { |
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| 58 | Vector<Float> out; |
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| 59 | switch(index) { |
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| 60 | case 0: |
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[980] | 61 | out = (getSpectrum(0)+getSpectrum(1))/Float(2.0); |
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[1007] | 62 | break; |
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[910] | 63 | case 1: |
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[980] | 64 | out = (getSpectrum(0)-getSpectrum(1))/Float(2.0); |
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[910] | 65 | break; |
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[1007] | 66 | case 2: |
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| 67 | out = getSpectrum(2)/Float(2.0); |
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| 68 | break; |
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| 69 | case 3: |
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| 70 | out = getSpectrum(3)/Float(2.0); |
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| 71 | break; |
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[910] | 72 | default: |
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| 73 | out = Vector<Float>(); |
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| 74 | } |
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| 75 | return out; |
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| 76 | |
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| 77 | } |
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| 78 | |
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| 79 | Vector<Float> asap::STPolStokes::getCircular(uInt index ) |
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| 80 | { |
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| 81 | // convert to stokes I/ V first |
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| 82 | // |
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| 83 | // We use the convention |
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| 84 | // I = (RR+LL) // definition changed |
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| 85 | |
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| 86 | if ( index == 2 || index ==3 ) throw(AipsError("Re/Imag RL not implemented")); |
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| 87 | Vector<Float> out; |
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| 88 | switch(index) { |
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| 89 | case 0: |
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[1007] | 90 | out = (getSpectrum(0) + getSpectrum(3))/Float(2.0); |
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[910] | 91 | break; |
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| 92 | case 1: |
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[1007] | 93 | out = (getSpectrum(0) - getSpectrum(3))/Float(2.0); |
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[910] | 94 | break; |
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| 95 | default: |
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| 96 | out = Vector<Float>(); |
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| 97 | } |
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| 98 | return out; |
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| 99 | } |
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| 100 | |
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| 101 | } |
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