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diff src/ov-base-sparse.cc @ 7644:91d7440211e7

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display percentage of elements that are nonzero when printing sparse matrices
author John W. Eaton <jwe@octave.org>
date Wed, 26 Mar 2008 12:56:51 -0400
parents a1dbe9d80eee
children 283989f2da9b
line wrap: on
line diff
--- a/src/ov-base-sparse.cc
+++ b/src/ov-base-sparse.cc
@@ -25,6 +25,7 @@
 #include <config.h>
 #endif
 
+#include <iomanip>
 #include <iostream>
 
 #include "oct-obj.h"
@@ -265,7 +266,14 @@
 
   os << "Compressed Column Sparse (rows = " << nr
      << ", cols = " << nc
-     << ", nnz = " << nz << ")\n";
+     << ", nnz = " << nz;
+
+  double dnel = matrix.numel ();
+
+  if (dnel > 0)
+    os << " [" << std::setprecision (2) << (nz / dnel * 100) << "%])\n";
+
+  os << ")\n";
 
   // add one to the printed indices to go from
   //  zero-based to one-based arrays