1 files changed, 11 insertions, 0 deletions
diff --git a/quantum_efficiency.c b/quantum_efficiency.c
index 02aea06..f8ae972 100644
--- a/quantum_efficiency.c
+++ b/quantum_efficiency.c
@@ -2,12 +2,17 @@
 #include <errno.h>
 #include <string.h>
 #include <stdlib.h>
+#include <gsl/gsl_errno.h>
+#include <gsl/gsl_spline.h>
 
 static int initialized = 0;
 
 static double *x, *y;
 static size_t size;
 
+gsl_interp_accel *acc;
+gsl_spline *spline;
+
 static int init()
 {
     int i;
@@ -94,6 +99,10 @@ static int init()
 
     fclose(f);
 
+    acc = gsl_interp_accel_alloc();
+    spline = gsl_spline_alloc(gsl_interp_linear, size);
+    gsl_spline_init(spline, x, y, size);
+
     initialized = 1;
 
     return 0;
@@ -111,4 +120,6 @@ double get_quantum_efficiency(double wavelength)
             exit(1);
         }
     }
+
+    return gsl_spline_eval(spline, wavelength, acc);
 }