Added support for cumprod, cumsum, triu, tril functions

1 files changed, 39 insertions, 0 deletions

diff --git a/src/c/differential_calculus/ode/doded.c b/src/c/differential_calculus/ode/doded.c
new file mode 100644
index 0000000..b544c42
--- /dev/null
+++ b/src/c/differential_calculus/ode/doded.c
@@ -0,0 +1,39 @@
+// 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: Siddhesh Wani
+// Organization: FOSSEE, IIT Bombay
+// Email: toolbox@scilab.in
+
+#include "ode.h"
+#include "types.h"
+#include <gsl/gsl_errno.h>
+#include <gsl/gsl_matrix.h>
+#include <gsl/gsl_odeiv2.h>
+
+
+void doded(double *initial_value, double start_time, double end_time, \
+			char *ode_function, double nequs, double eps_abs, double eps_rel, \
+			double step_size, double *out)
+{
+	double t = start_time;
+	//Setup ODE related parameters
+	gsl_odeiv2_system sys = {ode_function, NULL, 2, NULL};
+
+	gsl_odeiv2_step    *s = gsl_odeiv2_step_alloc (gsl_odeiv2_step_rkf45, nequs);
+  	gsl_odeiv2_control *c = gsl_odeiv2_control_y_new (eps_abs, eps_rel);
+  	gsl_odeiv2_evolve  *e = gsl_odeiv2_evolve_alloc (nequs);
+  
+  	while(t < end_time)
+  	{
+  		gsl_odeiv2_evolve_apply_fixed_step (e, c, s, &sys, &t, step_size, &out);
+	}
+
+	gsl_odeiv2_evolve_free (e);
+  	gsl_odeiv2_control_free (c);
+  	gsl_odeiv2_step_free (s);
+}