1 files changed, 26 insertions, 0 deletions
diff --git a/src/c/elementaryFunctions/interpolation/dinterp1s.c b/src/c/elementaryFunctions/interpolation/dinterp1s.c
new file mode 100644
index 00000000..17aeb876
--- /dev/null
+++ b/src/c/elementaryFunctions/interpolation/dinterp1s.c
@@ -0,0 +1,26 @@
+#include <stdio.h>
+#include "interp1.h"
+double  dinterp1s(double* x, int size, double* y,int size2, double xin, char* method,int size3)
+{
+   double x0=x[0];
+   double x1=x[size-1];
+   double y0=y[0];
+   double y1=y[size2-1];
+   double a = (y1 - y0) / (x1 - x0);
+   double b = ((-a)*x0) + y0;
+   double yout = 0.0;
+   yout=(double) ((a*xin) + b);
+   return yout;
+}
+
+/*
+int main(void)
+{
+    double x0=3, y0=0, x1=5, y1=8;
+    double x=4;
+    double y = linear_interpolation(x0, y0, x1, y1, x);
+    printf("(%f, %f), (%f, %f) for %f = %f\n", x0, y0, x1, y1, x, y);
+    return 0;
+
+}
+*/