From 3918d3a9b893ab5a2147dcae990f3f89805595a0 Mon Sep 17 00:00:00 2001
From: Antonin Portelli <antonin.portelli@me.com>
Date: Thu, 21 Mar 2019 17:40:02 +0000
Subject: [PATCH] function sampling method

---
 lib/Functional/Function.cpp | 20 ++++++++++++++++++++
 lib/Functional/Function.hpp |  2 ++
 2 files changed, 22 insertions(+)

diff --git a/lib/Functional/Function.cpp b/lib/Functional/Function.cpp
index f83fef2..6b31feb 100644
--- a/lib/Functional/Function.cpp
+++ b/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
 {
diff --git a/lib/Functional/Function.hpp b/lib/Functional/Function.hpp
index 2afdda7..859c705 100644
--- a/lib/Functional/Function.hpp
+++ b/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);