function sampling method

lib/Functional/Function.cpp

@@ -179,6 +179,26 @@ DoubleFunction DoubleFunction::bind(const Index argIndex,
     return bindFunc;
 }
 
+// sample //////////////////////////////////////////////////////////////////////
+DVec DoubleFunction::sample(const DMat &x)
+{
+    if (x.cols() != getNArg())
+    {
+        LATAN_ERROR(Size, "sampling point matrix and number of arguments "
+                          "mismatch (matrix has " + strFrom(x.cols())
+                          + ", number of arguments is " + strFrom(getNArg()) + ")");
+    }
+    
+    DVec res(x.rows());
+
+    for (Index i = 0; i < res.size(); ++i)
+    {
+        res(i) = (*this)(x.row(i));
+    }
+
+    return res;
+}
+
 // arithmetic operators ////////////////////////////////////////////////////////
 DoubleFunction DoubleFunction::operator-(void) const
 {

lib/Functional/Function.hpp

@@ -56,6 +56,8 @@ public:
     // bind
     DoubleFunction bind(const Index argIndex, const double val) const;
     DoubleFunction bind(const Index argIndex, const DVec &x) const;
+    // sample
+    DVec sample(const DMat &x);
     // arithmetic operators
     DoubleFunction   operator-(void) const;
     DoubleFunction & operator+=(const DoubleFunction &f);