Added some more methods to Interpolate (constness of compute and getYi)

src/interpolate.cpp

@@ -49,6 +49,28 @@ double Interpolate::compute(double x)
     return y;
 }
 
+double Interpolate::compute(double x) const
+  throw (InvalidRangeException)
+{
+  double y;
+
+  if (logx)
+    x = log(x);
+
+  int err = gsl_spline_eval_e(spline, x, 0, &y);
+
+  if (err)
+    throw InvalidRangeException("Interpolate argument outside range");
+
+  if (logy)
+    return exp(y);
+  else
+    return y;
+}
+
+
+
+
 double Interpolate::derivative(double x)
   throw (InvalidRangeException)
 {

src/interpolate.hpp

@@ -21,6 +21,8 @@ namespace CosmoTool
 
     double compute(double x)
       throw (InvalidRangeException);
+    double compute(double x) const
+      throw (InvalidRangeException);
     double derivative(double x)
       throw (InvalidRangeException);
 
@@ -30,6 +32,7 @@ namespace CosmoTool
     void fillWithXY(double *x, double *y) const;
     double getMaxX() const;
     double getXi(int i) const { return spline->x[i]; }
+    double getYi(int i) const { return spline->y[i]; }
   protected:
     gsl_interp_accel *accel_interp;
     gsl_spline *spline;