Index: trunk/psLib/src/dataManip/psConstants.h
===================================================================
--- trunk/psLib/src/dataManip/psConstants.h	(revision 1903)
+++ trunk/psLib/src/dataManip/psConstants.h	(revision 1907)
@@ -6,6 +6,6 @@
  *  @author GLG, MHPCC
  *
- *  @version $Revision: 1.2 $ $Name: not supported by cvs2svn $
- *  @date $Date: 2004-09-25 23:05:07 $
+ *  @version $Revision: 1.3 $ $Name: not supported by cvs2svn $
+ *  @date $Date: 2004-09-27 23:41:42 $
  *
  *  Copyright 2004 Maui High Performance Computing Center, University of Hawaii
@@ -48,4 +48,23 @@
 }
 
+/** Preprocessor macro to generate error on a NULL image */
+#define PS_CHECK_NULL_IMAGE(NAME)                                                           \
+if (NAME == NULL || NAME->data.V == NULL) {                                                         \
+    psError(__func__,"Invalid operation: %s or its data is NULL.", #NAME);                          \
+}
+
+/** Preprocessor macro to generate error for zero length rows or columns */
+#define PS_CHECK_EMPTY_IMAGE(NAME)                                                           \
+if (NAME->numCols < 1 || NAME->numRows < 1) {                                                       \
+    psError(__func__,"Invalid operation: %s has zero rows or columns (%dx%d).", #NAME,              \
+            NAME->numCols, NAME->numRows);                                                          \
+}
+
+/** Preprocessor macro to generate error on a NULL 1DPolynomial */
+#define PS_CHECK_NULL_1DPOLY(NAME)                                                          \
+if (NAME == NULL || NAME->coeff == NULL) {                                                         \
+    psError(__func__,"Invalid operation: %s or its data is NULL.", #NAME);                          \
+}
+
 #define PS_PRINT_VECTOR(NAME) \
 for (int my_i=0;my_i<NAME->n;my_i++) { \