add example with compression and remove useless scaling without compression

spm.c

@@ -25,6 +25,8 @@
 #include "s_spm.h"
 #include "p_spm.h"
 
+#include <cblas.h>
+
 #if !defined(DOXYGEN_SHOULD_SKIP_THIS)
 
 static int (*conversionTable[3][3][6])(pastix_spm_t*) = {
@@ -1179,7 +1181,7 @@ spmCheckAxb( int nrhs,
  *
  *******************************************************************************/
 void
-spmScal(const pastix_complex64_t alpha, pastix_spm_t* spm)
+spmScalMatrix(const pastix_complex64_t alpha, pastix_spm_t* spm)
 {
     switch(spm->flttype)
     {
@@ -1200,6 +1202,47 @@ spmScal(const pastix_complex64_t alpha, pastix_spm_t* spm)
     }
 }
 
+/**
+ *******************************************************************************
+ *
+ * @brief Scale a vector according to the spm type.
+ *
+ * x = alpha * x
+ *
+ *******************************************************************************
+ *
+ * @param[in] alpha
+ *           The scaling parameter.
+ *
+ * @param[in] spm
+ *          The spm structure to know the type of the vector.
+ *
+ * @param[inout] x
+ *          The vector to scal.
+ *
+ *******************************************************************************/
+void
+spmScalVector(const double alpha, pastix_spm_t* spm, void *x)
+{
+    switch(spm->flttype)
+    {
+    case PastixPattern:
+        break;
+    case PastixFloat:
+        cblas_sscal(spm->n, alpha, x, 1);
+        break;
+    case PastixComplex32:
+        cblas_csscal(spm->n, alpha, x, 1);
+        break;
+    case PastixComplex64:
+        cblas_zdscal(spm->n, alpha, x, 1);
+        break;
+    case PastixDouble:
+    default:
+        cblas_dscal(spm->n, alpha, x, 1);
+    }
+}
+
 /**
  * @}
  */

spm.h

@@ -90,7 +90,8 @@ void          spmUpdateComputedFields( pastix_spm_t *spm );
  */
 double        spmNorm( pastix_normtype_t ntype, const pastix_spm_t *spm );
 int           spmMatVec(const pastix_trans_t trans, const void *alpha, const pastix_spm_t *spm, const void *x, const void *beta, void *y );
-void          spmScal( const pastix_complex64_t alpha, pastix_spm_t* spm );
+void          spmScalMatrix( const pastix_complex64_t alpha, pastix_spm_t* spm );
+void          spmScalVector( const double alpha, pastix_spm_t* spm, void *x );
 
 /**
  * @}