6 files changed, 214 insertions, 0 deletions
diff --git a/src/c/specialFunctions/erfinv/derfinva.c b/src/c/specialFunctions/erfinv/derfinva.c
new file mode 100644
index 0000000..45d119c
--- /dev/null
+++ b/src/c/specialFunctions/erfinv/derfinva.c
@@ -0,0 +1,25 @@
+/* Copyright (C) 2016 - IIT Bombay - FOSSEE
+
+ 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
+ Author: Brijesh Gupta C R
+ Organization: FOSSEE, IIT Bombay
+ Email: toolbox@scilab.in
+*/
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <math.h>
+#include "erfinv.h"
+
+void derfinva(double* inp1, int sizer, int sizec,double* out)
+{
+    for (int i = 0; i < sizer*sizec; i++)
+    {
+	out[i] = derfinvs(inp1[i]);
+    }
+}
+
diff --git a/src/c/specialFunctions/erfinv/derfinvs.c b/src/c/specialFunctions/erfinv/derfinvs.c
new file mode 100644
index 0000000..379d6af
--- /dev/null
+++ b/src/c/specialFunctions/erfinv/derfinvs.c
@@ -0,0 +1,49 @@
+/* Copyright (C) 2016 - IIT Bombay - FOSSEE
+
+ 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
+ Author: Brijesh Gupta C R
+ Organization: FOSSEE, IIT Bombay
+ Email: toolbox@scilab.in
+*/
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <math.h>
+#include "erfinv.h"
+
+# define PI 3.1415927
+
+double derfinvs (double inp1)
+{
+    double a[] = {0.88622692374517353,-1.6601283962374516,0.92661860147244357,-0.14110320437680104};
+    double b[] = {-2.13505380615258078,1.46060340345661088,-0.33198239813321595,0.01197270616590528};
+    double c[] = {-1.994216456587148,-1.87267416351196,3.60874665878559364,1.82365845766309853};
+    double d[] = {3.74146294065960872,1.81848952562894617};
+
+    if ((inp1 > 1) || (inp1 < -1))
+    {
+	return 0.0/0.0;
+    }    
+    if ((inp1 >= -0.7) && (inp1 <= 0.7))
+    {
+        double sq = inp1 * inp1;
+        return (inp1 * (((a[3]*sq+a[2]) * sq+a[1]) * sq+a[0]) /  ((((b[3]*sq+b[2]) * sq+b[1]) * sq+b[0]) * sq+1));
+    }
+
+    else if ((inp1 > 0.7) && (inp1 < 1))
+    {
+        double z = sqrt(-log((1-inp1)/2));
+        return ((((c[3]*z+c[2]) * z+c[1]) * z+c[0]) / ((d[1]*z+d[0]) * z+1));
+    }
+
+    else if ((inp1 > -1) && (inp1 < 0.7))
+    {
+        double z = sqrt(-log((1+inp1)/2));
+        return (-(((c[3]*z+c[2]) * z+c[1]) * z+c[0]) / ((d[1]*z+d[0]) * z+1));
+    }
+}
+
diff --git a/src/c/specialFunctions/erfinv/serfinva.c b/src/c/specialFunctions/erfinv/serfinva.c
new file mode 100644
index 0000000..56e47c2
--- /dev/null
+++ b/src/c/specialFunctions/erfinv/serfinva.c
@@ -0,0 +1,25 @@
+/* Copyright (C) 2016 - IIT Bombay - FOSSEE
+
+ 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
+ Author: Brijesh Gupta C R
+ Organization: FOSSEE, IIT Bombay
+ Email: toolbox@scilab.in
+*/
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <math.h>
+#include "erfinv.h"
+
+void serfinva(float* inp1, int sizer, int sizec,float* out)
+{
+    for (int i = 0; i < sizer*sizec; i++)
+    {
+	out[i] = derfinvs(inp1[i]);
+    }
+}
+
diff --git a/src/c/specialFunctions/erfinv/serfinvs.c b/src/c/specialFunctions/erfinv/serfinvs.c
new file mode 100644
index 0000000..2d97ef7
--- /dev/null
+++ b/src/c/specialFunctions/erfinv/serfinvs.c
@@ -0,0 +1,50 @@
+/* Copyright (C) 2016 - IIT Bombay - FOSSEE
+
+ 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
+ Author: Brijesh Gupta C R
+ Organization: FOSSEE, IIT Bombay
+ Email: toolbox@scilab.in
+*/
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <math.h>
+#include "erfinv.h"
+
+# define PI 3.1415927
+
+float serfinvs (float inp1)
+{
+    float a[] = {0.88622692374517353,-1.6601283962374516,0.92661860147244357,-0.14110320437680104};
+    float b[] = {-2.13505380615258078,1.46060340345661088,-0.33198239813321595,0.01197270616590528};
+    float c[] = {-1.994216456587148,-1.87267416351196,3.60874665878559364,1.82365845766309853};
+    float d[] = {3.74146294065960872,1.81848952562894617};
+
+    if ((inp1 > 1) || (inp1 < -1))
+    {
+	double na = 0.0/0.0;	
+	return (float)na;
+    }    
+    if ((inp1 >= -0.7) && (inp1 <= 0.7))
+    {
+        float sq = inp1 * inp1;
+        return (inp1 * (((a[3]*sq+a[2]) * sq+a[1]) * sq+a[0]) /  ((((b[3]*sq+b[2]) * sq+b[1]) * sq+b[0]) * sq+1));
+    }
+
+    else if ((inp1 > 0.7) && (inp1 < 1))
+    {
+        float z = sqrt(-log((1-inp1)/2));
+        return ((((c[3]*z+c[2]) * z+c[1]) * z+c[0]) / ((d[1]*z+d[0]) * z+1));
+    }
+
+    else if ((inp1 > -1) && (inp1 < 0.7))
+    {
+        float z = sqrt(-log((1+inp1)/2));
+        return (-(((c[3]*z+c[2]) * z+c[1]) * z+c[0]) / ((d[1]*z+d[0]) * z+1));
+    }
+}
+
diff --git a/src/c/specialFunctions/includes/erfinv.h b/src/c/specialFunctions/includes/erfinv.h
new file mode 100644
index 0000000..5d6210c
--- /dev/null
+++ b/src/c/specialFunctions/includes/erfinv.h
@@ -0,0 +1,35 @@
+/*
+ *  Scilab ( http://www.scilab.org/ ) - This file is part of Scilab
+ *  Copyright (C) 2008-2008 - INRIA - Bruno JOFRET
+ *
+ *  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
+ *
+ */
+
+#ifndef __ERFINV_H__
+#define __ERFINV_H__
+#include "types.h"
+#include "floatComplex.h"
+#include "doubleComplex.h"
+#include "uint8.h"
+#include "uint16.h"
+#include "int16.h"
+
+#ifdef  __cplusplus
+extern "C" {
+#endif
+
+double derfinvs (double inp1);
+float serfinvs (float inp1);
+void derfinva(double* inp1, int sizer, int sizec,double* out);
+void serfinva(float* inp1, int sizer, int sizec,float* out);
+
+#ifdef  __cplusplus 
+} /* extern "C" */
+#endif
+
+#endif /*__ERFINV_H__*/
diff --git a/src/c/specialFunctions/interfaces/int_erfinv.h b/src/c/specialFunctions/interfaces/int_erfinv.h
new file mode 100644
index 0000000..f19baa1
--- /dev/null
+++ b/src/c/specialFunctions/interfaces/int_erfinv.h
@@ -0,0 +1,30 @@
+/* Copyright (C) 2017 - IIT Bombay - FOSSEE
+
+ 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
+ Author: Brijesh Gupta C R
+ Organization: FOSSEE, IIT Bombay
+ Email: toolbox@scilab.in
+ */
+#ifndef __INT_ERFINV_H__
+#define __INT_ERFINV_H__
+
+#ifdef  __cplusplus
+extern "C" {
+#endif
+
+
+
+#define d0erfinvd0(in1) derfinvs(in1)
+#define s0erfinvs0(in1) serfinvs(in1)
+#define d2erfinvd2(in1,size,out) derfinva(in1,size[0],size[1],out)
+#define s2erfinvs2(in1,size,out) serfinva(in1,size[0],size[1],out)
+
+#ifdef  __cplusplus
+} /* extern "C" */
+#endif
+
+#endif /*__INT_ERFINV_H__*/