Refs #9782. Added Gaussian function with numerical derivatives

The same as GaussianAutoDiff, for comparison.

Code/Mantid/Framework/CurveFitting/CMakeLists.txt

@@ -48,6 +48,7 @@ set ( SRC_FILES
 	src/Gaussian.cpp
 	src/GaussianAutoDiff.cpp
 	src/GaussianComptonProfile.cpp
+	src/GaussianNumDiff.cpp
 	src/GramCharlierComptonProfile.cpp
 	src/IkedaCarpenterPV.cpp
 	src/LeBailFit.cpp
@@ -154,6 +155,7 @@ set ( INC_FILES
 	inc/MantidCurveFitting/Gaussian.h
 	inc/MantidCurveFitting/GaussianAutoDiff.h
 	inc/MantidCurveFitting/GaussianComptonProfile.h
+	inc/MantidCurveFitting/GaussianNumDiff.h
 	inc/MantidCurveFitting/GramCharlierComptonProfile.h
 	inc/MantidCurveFitting/IkedaCarpenterPV.h
 	inc/MantidCurveFitting/Jacobian.h
@@ -249,6 +251,7 @@ set ( TEST_FILES
 	GausOscTest.h
 	GaussianAutoDiffTest.h
 	GaussianComptonProfileTest.h
+	GaussianNumDiffTest.h
 	GaussianTest.h
 	GramCharlierComptonProfileTest.h
 	IkedaCarpenterPVTest.h

Code/Mantid/Framework/CurveFitting/inc/MantidCurveFitting/GaussianNumDiff.h

@@ -0,0 +1,56 @@
+#ifndef MANTID_CURVEFITTING_GAUSSIANNUMDIFF_H_
+#define MANTID_CURVEFITTING_GAUSSIANNUMDIFF_H_
+
+#include "MantidKernel/System.h"
+
+#include "MantidAPI/IFunction1D.h"
+#include "MantidAPI/ParamFunction.h"
+
+
+namespace Mantid
+{
+namespace CurveFitting
+{
+
+  /** GaussianNumDiff : TODO: DESCRIPTION
+    
+    Copyright © 2014 ISIS Rutherford Appleton Laboratory & NScD Oak Ridge National Laboratory
+
+    This file is part of Mantid.
+
+    Mantid is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 3 of the License, or
+    (at your option) any later version.
+
+    Mantid is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+    File change history is stored at: <https://github.com/mantidproject/mantid>
+    Code Documentation is available at: <http://doxygen.mantidproject.org>
+  */
+  class DLLExport GaussianNumDiff : public API::IFunction1D, public API::ParamFunction
+  {
+  public:
+    GaussianNumDiff();
+    virtual ~GaussianNumDiff();
+
+    std::string name() const { return "GaussianNumDiff"; }
+
+    void function1D(double *out, const double *xValues, const size_t nData) const;
+
+  protected:
+    void init();
+
+  };
+
+
+} // namespace CurveFitting
+} // namespace Mantid
+
+#endif  /* MANTID_CURVEFITTING_GAUSSIANNUMDIFF_H_ */

Code/Mantid/Framework/CurveFitting/src/GaussianNumDiff.cpp

@@ -0,0 +1,43 @@
+#include "MantidCurveFitting/GaussianNumDiff.h"
+
+namespace Mantid
+{
+namespace CurveFitting
+{
+
+
+  //----------------------------------------------------------------------------------------------
+  /** Constructor
+   */
+  GaussianNumDiff::GaussianNumDiff()
+  {
+  }
+
+  //----------------------------------------------------------------------------------------------
+  /** Destructor
+   */
+  GaussianNumDiff::~GaussianNumDiff()
+  {
+  }
+
+  void GaussianNumDiff::function1D(double *out, const double *xValues, const size_t nData) const
+  {
+      double height = getParameter("Height");
+      double centre = getParameter("PeakCentre");
+      double sigma = getParameter("Sigma");
+
+      for(size_t i = 0; i < nData; ++i) {
+          out[i] = height * exp(-0.5 * pow( (xValues[i] - centre)/sigma, 2.0) );
+      }
+  }
+
+  void GaussianNumDiff::init() {
+      declareParameter("Height");
+      declareParameter("PeakCentre");
+      declareParameter("Sigma");
+  }
+
+
+
+} // namespace CurveFitting
+} // namespace Mantid

Code/Mantid/Framework/CurveFitting/test/GaussianNumDiffTest.h

@@ -0,0 +1,29 @@
+#ifndef MANTID_CURVEFITTING_GAUSSIANNUMDIFFTEST_H_
+#define MANTID_CURVEFITTING_GAUSSIANNUMDIFFTEST_H_
+
+#include <cxxtest/TestSuite.h>
+
+#include "MantidCurveFitting/GaussianNumDiff.h"
+
+using Mantid::CurveFitting::GaussianNumDiff;
+using namespace Mantid::API;
+
+class GaussianNumDiffTest : public CxxTest::TestSuite
+{
+public:
+  // This pair of boilerplate methods prevent the suite being created statically
+  // This means the constructor isn't called when running other tests
+  static GaussianNumDiffTest *createSuite() { return new GaussianNumDiffTest(); }
+  static void destroySuite( GaussianNumDiffTest *suite ) { delete suite; }
+
+
+  void test_Something()
+  {
+    TSM_ASSERT( "You forgot to write a test!", 0);
+  }
+
+
+};
+
+
+#endif /* MANTID_CURVEFITTING_GAUSSIANNUMDIFFTEST_H_ */