Add simple API to set Pastix parameters

Eigen/PaStiXSupport

@@ -0,0 +1,38 @@
+#ifndef EIGEN_PASTIXSUPPORT_MODULE_H
+#define EIGEN_PASTIXSUPPORT_MODULE_H
+
+#include "SparseCore"
+
+#include "src/Core/util/DisableStupidWarnings.h"
+
+#include <complex.h>
+extern "C" {
+#include <pastix_nompi.h>
+#include <pastix.h>
+}
+
+#ifdef complex
+#undef complex
+#endif
+
+namespace Eigen {
+
+/** \ingroup Support_modules
+  * \defgroup PaStiXSupport_Module PaStiXSupport module
+  *
+  * \code
+  * #include <Eigen/PaStiXSupport>
+  * \endcode
+  */
+
+#include "src/misc/Solve.h"
+#include "src/misc/SparseSolve.h"
+
+#include "src/PaStiXSupport/PaStiXSupport.h"
+
+
+} // namespace Eigen
+
+#include "src/Core/util/ReenableStupidWarnings.h"
+
+#endif // EIGEN_PASTIXSUPPORT_MODULE_H

Eigen/src/PaStiXSupport/PaStiXSupport.h

@@ -246,6 +246,15 @@ class PastixBase
       return m_iparm; 
     }
     
+    /** Return a reference to a particular index parameter of the IPARM vector 
+     * \sa iparm()
+     */
+    
+    int& iparm(int idxparam)
+    {
+      return m_iparm(idxparam);
+    }
+    
      /** Returns a reference to the double vector DPARM of PaStiX parameters 
       * The statistics related to the different phases of factorization and solve are saved here as well
       * \sa analyzePattern() factorize()
@@ -255,6 +264,16 @@ class PastixBase
       return m_dparm; 
     }
     
+    
+    /** Return a reference to a particular index parameter of the DPARM vector 
+     * \sa dparm()
+     */
+    
+    double& dparm(int idxparam)
+    {
+      return m_dparm(idxparam);
+    }
+    
     inline Index cols() const { return m_size; }
     inline Index rows() const { return m_size; }
     
@@ -304,7 +323,7 @@ class PastixBase
     int m_analysisIsOk;
     int m_factorizationIsOk;
     bool m_isInitialized;
-    ComputationInfo m_info; 
+    mutable ComputationInfo m_info; 
     mutable pastix_data_t *m_pastixdata; // Data structure for pastix
     mutable SparseMatrix<Scalar, ColMajor> m_mat_null; // An input  null matrix
     mutable Matrix<Scalar, Dynamic,1> m_vec_null; // An input null vector