diff options
Diffstat (limited to 'src/c/elementaryFunctions/log/clogs.c')
-rw-r--r-- | src/c/elementaryFunctions/log/clogs.c | 130 |
1 files changed, 65 insertions, 65 deletions
diff --git a/src/c/elementaryFunctions/log/clogs.c b/src/c/elementaryFunctions/log/clogs.c index 3b9f6911..c351cf3c 100644 --- a/src/c/elementaryFunctions/log/clogs.c +++ b/src/c/elementaryFunctions/log/clogs.c @@ -1,65 +1,65 @@ -/*
- * Scilab ( http://www.scilab.org/ ) - This file is part of Scilab
- * Copyright (C) 2007-2008 - INRIA - Bruno JOFRET
- * Copyright (C) Bruno Pincon
- *
- * This file must be used under the terms of the CeCILL.
- * This source file is licensed as described in the file COPYING, which
- * you should have received as part of this distribution. The terms
- * are also available at
- * http://www.cecill.info/licences/Licence_CeCILL_V2-en.txt
- *
- */
-
-#include <math.h>
-#include "log.h"
-#include "lapack.h"
-#include "log1p.h"
-#include "pythag.h"
-
-floatComplex clogs(floatComplex in) {
- static float sR2 = 1.41421356237309504f;
-
- float _RealIn = creals(in);
- float _ImgIn = cimags(in);
-
- float _RealOut = 0;
- float _ImgOut = 0;
-
- float RMax = (float) getOverflowThreshold();
- float LInf = sqrtf((float) getUnderflowThreshold());
- float LSup = sqrtf(0.5f * RMax);
-
- float AbsReal = fabsf(_RealIn);
- float AbsImg = fabsf(_ImgIn);
-
- _ImgOut = atan2f(_ImgIn, _RealIn);
-
- if(_ImgIn > _RealIn)
- {/* switch Real part and Imaginary part */
- float Temp = AbsReal;
- AbsReal = AbsImg;
- AbsImg = Temp;
- }
-
- if((0.5 <= AbsReal) && (AbsReal <= sR2))
- _RealOut = 0.5f * slog1ps((AbsReal - 1.0f) * (AbsReal + 1.0f) + AbsImg * AbsImg);
- else if(LInf < AbsImg && AbsReal < LSup)
- _RealOut = 0.5f * slogs(AbsReal * AbsReal + AbsImg * AbsImg);
- else if(AbsReal > RMax)
- _RealOut = AbsReal;
- else
- {
- float Temp = spythags(AbsReal, AbsImg);
- if(Temp <= RMax)
- {
- _RealOut = slogs(Temp);
- }
- else /* handle rare spurious overflow with : */
- {
- float Temp2 = AbsImg/AbsReal;
- _RealOut = slogs(AbsReal) + 0.5f * slog1ps(Temp2 * Temp2);
- }
- }
- return FloatComplex(_RealOut, _ImgOut);
-}
+/* + * Scilab ( http://www.scilab.org/ ) - This file is part of Scilab + * Copyright (C) 2007-2008 - INRIA - Bruno JOFRET + * Copyright (C) Bruno Pincon + * + * This file must be used under the terms of the CeCILL. + * This source file is licensed as described in the file COPYING, which + * you should have received as part of this distribution. The terms + * are also available at + * http://www.cecill.info/licences/Licence_CeCILL_V2-en.txt + * + */ + +#include <math.h> +#include "log.h" +#include "lapack.h" +#include "log1p.h" +#include "pythag.h" + +floatComplex clogs(floatComplex in) { + static float sR2 = 1.41421356237309504f; + + float _RealIn = creals(in); + float _ImgIn = cimags(in); + + float _RealOut = 0; + float _ImgOut = 0; + + float RMax = (float) getOverflowThreshold(); + float LInf = sqrtf((float) getUnderflowThreshold()); + float LSup = sqrtf(0.5f * RMax); + + float AbsReal = fabsf(_RealIn); + float AbsImg = fabsf(_ImgIn); + + _ImgOut = atan2f(_ImgIn, _RealIn); + + if(_ImgIn > _RealIn) + {/* switch Real part and Imaginary part */ + float Temp = AbsReal; + AbsReal = AbsImg; + AbsImg = Temp; + } + + if((0.5 <= AbsReal) && (AbsReal <= sR2)) + _RealOut = 0.5f * slog1ps((AbsReal - 1.0f) * (AbsReal + 1.0f) + AbsImg * AbsImg); + else if(LInf < AbsImg && AbsReal < LSup) + _RealOut = 0.5f * slogs(AbsReal * AbsReal + AbsImg * AbsImg); + else if(AbsReal > RMax) + _RealOut = AbsReal; + else + { + float Temp = spythags(AbsReal, AbsImg); + if(Temp <= RMax) + { + _RealOut = slogs(Temp); + } + else /* handle rare spurious overflow with : */ + { + float Temp2 = AbsImg/AbsReal; + _RealOut = slogs(AbsReal) + 0.5f * slog1ps(Temp2 * Temp2); + } + } + return FloatComplex(_RealOut, _ImgOut); +} |