diff options
Diffstat (limited to 'src/c/elementaryFunctions/log/zlogs.c')
-rw-r--r-- | src/c/elementaryFunctions/log/zlogs.c | 130 |
1 files changed, 65 insertions, 65 deletions
diff --git a/src/c/elementaryFunctions/log/zlogs.c b/src/c/elementaryFunctions/log/zlogs.c index e5e9ded1..de947bf4 100644 --- a/src/c/elementaryFunctions/log/zlogs.c +++ b/src/c/elementaryFunctions/log/zlogs.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"
-
-doubleComplex zlogs(doubleComplex in) {
- static double sR2 = 1.41421356237309504;
-
- double _RealIn = zreals(in);
- double _ImgIn = zimags(in);
-
- double _RealOut = 0;
- double _ImgOut = 0;
-
- double RMax = getOverflowThreshold();
- double LInf = sqrt(getUnderflowThreshold());
- double LSup = sqrt(0.5 * RMax);
-
- double AbsReal = fabs(_RealIn);
- double AbsImg = fabs(_ImgIn);
-
- _ImgOut = atan2(_ImgIn, _RealIn);
-
- if(_ImgIn > _RealIn)
- {/* switch Real part and Imaginary part */
- double Temp = AbsReal;
- AbsReal = AbsImg;
- AbsImg = Temp;
- }
-
- if((0.5 <= AbsReal) && (AbsReal <= sR2))
- _RealOut = 0.5 * dlog1ps((AbsReal - 1) * (AbsReal + 1) + AbsImg * AbsImg);
- else if(LInf < AbsImg && AbsReal < LSup)
- _RealOut = 0.5 * dlogs(AbsReal * AbsReal + AbsImg * AbsImg);
- else if(AbsReal > RMax)
- _RealOut = AbsReal;
- else
- {
- double Temp = dpythags(AbsReal, AbsImg);
- if(Temp <= RMax)
- {
- _RealOut = dlogs(Temp);
- }
- else /* handle rare spurious overflow with : */
- {
- double Temp2 = AbsImg/AbsReal;
- _RealOut = dlogs(AbsReal) + 0.5 * dlog1ps(Temp2 * Temp2);
- }
- }
- return DoubleComplex(_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" + +doubleComplex zlogs(doubleComplex in) { + static double sR2 = 1.41421356237309504; + + double _RealIn = zreals(in); + double _ImgIn = zimags(in); + + double _RealOut = 0; + double _ImgOut = 0; + + double RMax = getOverflowThreshold(); + double LInf = sqrt(getUnderflowThreshold()); + double LSup = sqrt(0.5 * RMax); + + double AbsReal = fabs(_RealIn); + double AbsImg = fabs(_ImgIn); + + _ImgOut = atan2(_ImgIn, _RealIn); + + if(_ImgIn > _RealIn) + {/* switch Real part and Imaginary part */ + double Temp = AbsReal; + AbsReal = AbsImg; + AbsImg = Temp; + } + + if((0.5 <= AbsReal) && (AbsReal <= sR2)) + _RealOut = 0.5 * dlog1ps((AbsReal - 1) * (AbsReal + 1) + AbsImg * AbsImg); + else if(LInf < AbsImg && AbsReal < LSup) + _RealOut = 0.5 * dlogs(AbsReal * AbsReal + AbsImg * AbsImg); + else if(AbsReal > RMax) + _RealOut = AbsReal; + else + { + double Temp = dpythags(AbsReal, AbsImg); + if(Temp <= RMax) + { + _RealOut = dlogs(Temp); + } + else /* handle rare spurious overflow with : */ + { + double Temp2 = AbsImg/AbsReal; + _RealOut = dlogs(AbsReal) + 0.5 * dlog1ps(Temp2 * Temp2); + } + } + return DoubleComplex(_RealOut, _ImgOut); +} |