Added more explanation for setMPI()

Author: Martin D. Weinberg

exputil/ParticleReader.cc

@@ -35,7 +35,7 @@ namespace PR {
   { {"Gas", 0}, {"Halo", 1}, {"Disk", 2}, {"Bulge", 3}, {"Stars", 4}, {"Bndry", 5}};
 
 
-  GadgetNative::GadgetNative(const std::vector<std::string>& files, bool verbose)
+  GadgetNative::GadgetNative(const std::vector<std::string>& files, bool verbose) : ParticleReader()
   {
     _files   = files;		// Copy file list (bunch)
     _verbose = verbose;
@@ -317,7 +317,7 @@ namespace PR {
   { {"Gas", 0}, {"Halo", 1}, {"Disk", 2}, {"Bulge", 3}, {"Stars", 4}, {"Bndry", 5}};
 
 
-  GadgetHDF5::GadgetHDF5(const std::vector<std::string>& files, bool verbose)
+  GadgetHDF5::GadgetHDF5(const std::vector<std::string>& files, bool verbose) : ParticleReader()
   {
     _files   = files;
     _verbose = verbose;
@@ -705,7 +705,7 @@ namespace PR {
   }
 
 
-  PSPhdf5::PSPhdf5(const std::vector<std::string>& files, bool verbose)
+  PSPhdf5::PSPhdf5(const std::vector<std::string>& files, bool verbose) : ParticleReader()
   {
     _files   = files;
     _verbose = verbose;
@@ -2125,7 +2125,7 @@ namespace PR {
   }
 
   Tipsy::Tipsy(const std::string& file, TipsyType Type,
-	       bool verbose)
+	       bool verbose) : ParticleReader()
   {
     ttype = Type;
     files.push_back(file);
@@ -2137,7 +2137,7 @@ namespace PR {
   }
 
   Tipsy::Tipsy(const std::vector<std::string>& filelist, TipsyType Type,
-	       bool verbose)
+	       bool verbose) : ParticleReader()
   {
     files = filelist;
 

include/ParticleReader.H

@@ -456,7 +456,7 @@ namespace PR
   public:
 
     //! Default constructor
-    PSP(bool verbose) : VERBOSE(verbose) { init(); }
+    PSP(bool verbose) : VERBOSE(verbose), ParticleReader() { init(); }
 
     //! Destructor
     virtual ~PSP() { if (in.is_open()) in.close(); }

pyEXP/UtilWrappers.cc

@@ -224,14 +224,19 @@ void UtilityClasses(py::module &m) {
       }
     },
     R"(
-      Initialize EXP for MPI from Python.
+      Initialize EXP's C++ MPI communicators and variables from pyEXP
   
-      Sets internal MPI-specific library values necessary to MPI from Python scripts.
-   
+      Sets all of the internal MPI-specific library values necessary
+      to use the full complement of the EXP C++ classes from Python
+      scripts.  For example, this is needed for ParticleReader, which
+      does not provide its own MPI initialization. The BasisFactory,
+      Basis, ParticleReader, and FieldGenerator classes can do this
+      automatically.
+
       Parameters
       ----------
       verbose : bool
-         If true, print the node and process assignments
+         Print the node and process assignments.  Default: false.
 
       Returns
       -------