1 files changed, 57 insertions, 0 deletions
diff --git a/2.3-1/src/c/signalProcessing/amell/damells.c b/2.3-1/src/c/signalProcessing/amell/damells.c
new file mode 100644
index 00000000..90c20530
--- /dev/null
+++ b/2.3-1/src/c/signalProcessing/amell/damells.c
@@ -0,0 +1,57 @@
+/* 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: Ankit Raj
+ Organization: FOSSEE, IIT Bombay
+ Email: toolbox@scilab.in
+ */
+
+#include<stdio.h>
+#include<math.h>
+#include "amell.h"
+#define N 30
+#define DBL_EPSILON 2.2204460492503131E-16
+
+
+double damells(double u,double x)
+{
+	 double a[N+1];
+	 double g[N+1];
+	 double c[N+1];
+	 double two_n;
+	 double phi;
+	 double k;
+	int n;
+	k=(long double)fabs(x);
+	if(k==1.0)
+	return 0;
+	if(k>1.0)
+	printf("Wrong type of input argument type #2");
+	
+	a[0]=1.0;
+	g[0]=sqrt(1.0-k*k);
+	c[0]=k;
+	two_n=1.0;
+	for(n=0;n<N;n++)
+	{
+	if(fabs(a[n]-g[n])<(a[n]*DBL_EPSILON))
+	{
+	break;
+	}
+	two_n+=two_n;
+	a[n+1]=0.5*(a[n]+g[n]);
+	g[n+1]=sqrt(a[n]*g[n]);
+	c[n+1]=0.5*(a[n]-g[n]);
+	}
+	phi=two_n*a[n]*u;
+	for(;n>0;n--)
+	{
+	phi=0.5*(phi+asin(c[n]*sin(phi)/a[n]));
+	}
+	return (double)phi;
+}
+