X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=src%2Flanguage%2Fstats%2Fmatrix.c;h=8a08740183a54f72dba21798abae29d9fa42d6c1;hb=faef2451e5aaeb4841a7b8a42a0e8386e591d257;hp=64d8dd92f83873465a0727415c1604c3843a452c;hpb=8a7698655f6f01e83c99a0eab7597dc5ce7a64ca;p=pspp

diff --git a/src/language/stats/matrix.c b/src/language/stats/matrix.c
index 64d8dd92f8..8a08740183 100644
--- a/src/language/stats/matrix.c
+++ b/src/language/stats/matrix.c
@@ -1851,21 +1851,24 @@ matrix_eval_IDENT (double s1, double s2)
   return m;
 }
 
+/* Inverts X, storing the inverse into INVERSE.  As a side effect, replaces X
+   by its LU decomposition. */
 static void
-invert_matrix (gsl_matrix *x)
+invert_matrix (gsl_matrix *x, gsl_matrix *inverse)
 {
   gsl_permutation *p = gsl_permutation_alloc (x->size1);
   int signum;
   gsl_linalg_LU_decomp (x, p, &signum);
-  gsl_linalg_LU_invx (x, p);
+  gsl_linalg_LU_invert (x, p, inverse);
   gsl_permutation_free (p);
 }
 
 static gsl_matrix *
-matrix_eval_INV (gsl_matrix *m)
+matrix_eval_INV (gsl_matrix *src)
 {
-  invert_matrix (m);
-  return m;
+  gsl_matrix *dst = gsl_matrix_alloc (src->size1, src->size2);
+  invert_matrix (src, dst);
+  return dst;
 }
 
 static gsl_matrix *
@@ -3405,7 +3408,10 @@ matrix_expr_evaluate_exp_mat (const struct matrix_expr *e,
 
   mul_matrix (&y, x, y, &t);
   if (bf < 0)
-    invert_matrix (y);
+    {
+      invert_matrix (y, x);
+      swap_matrix (&x, &y);
+    }
 
   /* Garbage collection.