Index: trunk/psLib/src/math/psMatrix.c
===================================================================
--- trunk/psLib/src/math/psMatrix.c	(revision 12293)
+++ trunk/psLib/src/math/psMatrix.c	(revision 15767)
@@ -22,6 +22,6 @@
  *  @author Andy Becker, University of Washington (SVD).
  *
- *  @version $Revision: 1.49 $ $Name: not supported by cvs2svn $
- *  @date $Date: 2007-03-07 21:12:13 $
+ *  @version $Revision: 1.50 $ $Name: not supported by cvs2svn $
+ *  @date $Date: 2007-12-08 01:31:58 $
  *
  *  Copyright 2004-2005 Maui High Performance Computing Center, University of Hawaii
@@ -530,5 +530,4 @@
     #define INVERT_CLEANUP { psFree(out); return NULL; }
     // Error checks
-    PS_ASSERT_GENERAL_PTR_NON_NULL(determinant, INVERT_CLEANUP);
     PS_ASSERT_GENERAL_IMAGE_NON_NULL(in, INVERT_CLEANUP);
     PS_CHECK_POINTERS(in, out, INVERT_CLEANUP);
@@ -554,5 +553,7 @@
     gsl_linalg_LU_decomp(lu, perm, &signum);
     gsl_linalg_LU_invert(lu, perm, inv);
-    *determinant = (float)gsl_linalg_LU_det(lu, signum);
+    if (determinant) {
+        *determinant = (float)gsl_linalg_LU_det(lu, signum);
+    }
 
     // Copy GSL matrix data to psImage data
@@ -593,5 +594,4 @@
 
     // Calculate determinant
-    //    det = psAlloc(sizeof(psF32));
     gsl_linalg_LU_decomp(lu, perm, &signum);
     det = (psF32)gsl_linalg_LU_det(lu, signum);