Refs #4036 wiki docs

and windows fix maybe

Code/Mantid/Build/class_maker.py

@@ -86,7 +86,7 @@ class DLLExport %s %s
   {
   public:
     %s();
-    ~%s();
+    virtual ~%s();
     %s
   };
 

Code/Mantid/Framework/MDAlgorithms/inc/MantidMDAlgorithms/BinaryOperationMD.h

@@ -48,7 +48,7 @@ namespace MDAlgorithms
   {
   public:
     BinaryOperationMD();
-    ~BinaryOperationMD();
+    virtual ~BinaryOperationMD();
 
     virtual const std::string name() const;
     virtual int version() const;

Code/Mantid/Framework/MDAlgorithms/inc/MantidMDAlgorithms/DivideMD.h

@@ -38,7 +38,7 @@ namespace MDAlgorithms
   {
   public:
     DivideMD();
-    ~DivideMD();
+    virtual ~DivideMD();
 
     virtual const std::string name() const;
     virtual int version() const;

Code/Mantid/Framework/MDAlgorithms/inc/MantidMDAlgorithms/MinusMD.h

@@ -38,7 +38,7 @@ namespace MDAlgorithms
   {
   public:
     MinusMD();
-    ~MinusMD();
+    virtual ~MinusMD();
 
     virtual const std::string name() const;
     virtual int version() const;

Code/Mantid/Framework/MDAlgorithms/inc/MantidMDAlgorithms/MultiplyMD.h

@@ -38,7 +38,7 @@ namespace MDAlgorithms
   {
   public:
     MultiplyMD();
-    ~MultiplyMD();
+    virtual ~MultiplyMD();
 
     virtual const std::string name() const;
     virtual int version() const;

Code/Mantid/Framework/MDAlgorithms/inc/MantidMDAlgorithms/PlusMD.h

@@ -40,7 +40,7 @@ namespace MDAlgorithms
   {
   public:
     PlusMD();
-    ~PlusMD();
+    virtual ~PlusMD();
 
     /// Algorithm's name for identification 
     virtual const std::string name() const { return "PlusMD";};

Code/Mantid/Framework/MDAlgorithms/src/DivideMD.cpp

@@ -1,5 +1,17 @@
 /*WIKI*
-TODO: Enter a full wiki-markup description of your algorithm here. You can then use the Build/wiki_maker.py script to generate your full wiki page.
+Divide two [[MDHistoWorkspace]]'s or a MDHistoWorkspace and a scalar.
+
+The error of <math> f = a / b </math> is propagated with <math> df^2 = f^2 * (da^2 / a^2 + db^2 / b^2) </math>
+
+* '''MDHistoWorkspace / MDHistoWorkspace'''
+** The operation is performed element-by-element.
+* '''MDHistoWorkspace / Scalar'''
+** Every element of the MDHistoWorkspace is divided by the scalar.
+* '''Scalar / MDHistoWorkspace'''
+** This is not allowed.
+* '''[[MDEventWorkspace]]'s'''
+** This operation is not supported, as it is not clear what its meaning would be.
+
 *WIKI*/
 
 #include "MantidMDAlgorithms/DivideMD.h"
@@ -17,7 +29,6 @@ namespace MDAlgorithms
   DECLARE_ALGORITHM(DivideMD)
 
 
-
   //----------------------------------------------------------------------------------------------
   /** Constructor
    */

Code/Mantid/Framework/MDAlgorithms/src/MinusMD.cpp

@@ -1,17 +1,14 @@
 /*WIKI*
-Subtract two [[MDHistoWorkspace]]'s or [[MDEventWorkspace]]'s.
+Subtract two [[MDHistoWorkspace]]'s or a MDHistoWorkspace and a scalar.
 
-=== MDHistoWorkspace - MDHistoWorkspace ===
-
-The operation is performed element-by-element.
-
-=== MDHistoWorkspace - Scalar ===
-
-The scalar (and its error) is subtracted from every element of the MDHistoWorkspace.
-
-=== Scalar - MDHistoWorkspace ===
-
-This is not allowed.
+* '''MDHistoWorkspace - MDHistoWorkspace'''
+** The operation is performed element-by-element.
+* '''MDHistoWorkspace - Scalar '''
+** The scalar is subtracted from every element of the MDHistoWorkspace. The squares of errors are summed.
+* '''Scalar - MDHistoWorkspace'''
+** This is not allowed.
+* '''[[MDEventWorkspace]]'s'''
+** This is not currently supported, but it could be in the future.
 
 *WIKI*/
 
@@ -52,8 +49,8 @@ namespace MDAlgorithms
   /// Sets documentation strings for this algorithm
   void MinusMD::initDocs()
   {
-    this->setWikiSummary("Subtract two [[MDHistoWorkspace]]'s or [[MDEventWorkspace]]'s.");
-    this->setOptionalMessage("Subtract two MDHistoWorkspace's or MDEventWorkspace's.");
+    this->setWikiSummary("Subtract two [[MDHistoWorkspace]]s");
+    this->setOptionalMessage("Subtract two MDHistoWorkspaces.");
   }
 
 

Code/Mantid/Framework/MDAlgorithms/src/MultiplyMD.cpp

@@ -1,5 +1,15 @@
 /*WIKI*
-TODO: Enter a full wiki-markup description of your algorithm here. You can then use the Build/wiki_maker.py script to generate your full wiki page.
+Multiply two [[MDHistoWorkspace]]'s or a MDHistoWorkspace and a scalar.
+
+The error of <math> f = a * b </math> is propagated with <math>df^2 = f^2 * (da^2 / a^2 + db^2 / b^2)</math>
+
+* '''MDHistoWorkspace * MDHistoWorkspace'''
+** The operation is performed element-by-element.
+* '''MDHistoWorkspace * Scalar''' or '''Scalar * MDHistoWorkspace'''
+** Every element of the MDHistoWorkspace is multiplied by the scalar.
+* '''[[MDEventWorkspace]]'s'''
+** This operation is not supported, as it is not clear what its meaning would be.
+
 *WIKI*/
 
 #include "MantidMDAlgorithms/MultiplyMD.h"

Code/Mantid/Framework/MDAlgorithms/src/PlusMD.cpp

@@ -1,7 +1,29 @@
 /*WIKI* 
 
+This algorithm sums two [[MDHistoWorkspace]]s or merges two [[MDEventWorkspace]]s together.
+
+=== MDHistoWorkspaces ===
+
+* '''MDHistoWorkspace + MDHistoWorkspace'''
+** The operation is performed element-by-element.
+* '''MDHistoWorkspace + Scalar''' or '''Scalar + MDHistoWorkspace'''
+** The scalar is subtracted from every element of the MDHistoWorkspace. The squares of errors are summed.
+
+=== MDEventWorkspaces ===
+
 This algorithm operates similary to calling Plus on two [[EventWorkspace]]s: it combines the events from the two workspaces together to form one large workspace.
 
+==== Note for file-backed workspaces ====
+
+The algorithm uses [[CloneMDWorkspace]] to create the output workspace, except when adding in place (e.g. <math> A = A + B </math> ).
+See [[CloneMDWorkspace]] for details, but note that a file-backed [[MDEventWorkspace]] will have its file copied.
+
+* If A is in memory and B is file-backed, the operation <math> C = A + B </math> will clone the B file-backed workspace and add A to it.
+* However, the operation <math> A = A + B </math> will clone the A workspace and add B into memory (which might be too big!)
+
+Also, be aware that events added to a MDEventWorkspace are currently added '''in memory''' and are not cached to file until [[SaveMD]]
+or another algorithm requiring it is called. The workspace is marked as 'requiring file update'.
+
 *WIKI*/
 
 #include "MantidAPI/IMDEventWorkspace.h"
@@ -42,8 +64,8 @@ namespace MDAlgorithms
   /// Sets documentation strings for this algorithm
   void PlusMD::initDocs()
   {
-    this->setWikiSummary("Sum two [[MDHistoWorkspace]]s or merge two [[MDEventWorkspace]]s together by combining their events together in one workspace.");
-    this->setOptionalMessage("Sum two MDHistoWorkspaces or merge two MDEventWorkspaces together by combining their events together in one workspace.");
+    this->setWikiSummary("Sum two [[MDHistoWorkspace]]s or merges two [[MDEventWorkspace]]s together by combining their events together in one workspace.");
+    this->setOptionalMessage("Sum two MDHistoWorkspaces or merges two MDEventWorkspaces together by combining their events together in one workspace.");
   }