From 5414ff57a37bc7b079a50b1c032d34e2341452f9 Mon Sep 17 00:00:00 2001
From: Thomas White <taw@physics.org>
Date: Thu, 8 Aug 2013 11:49:59 +0200
Subject: Show determinant when complaining about a non-integer matrix result

---
 libcrystfel/src/integer_matrix.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/libcrystfel/src/integer_matrix.c b/libcrystfel/src/integer_matrix.c
index 96159cc6..018f0ca6 100644
--- a/libcrystfel/src/integer_matrix.c
+++ b/libcrystfel/src/integer_matrix.c
@@ -353,7 +353,9 @@ IntegerMatrix *intmat_inverse(const IntegerMatrix *m)
 
 	det = intmat_det(m);
 	if ( (det != +1) && (det != -1) ) {
-		fprintf(stderr, "Inverse matrix not an integer matrix.\n");
+		fprintf(stderr,
+		        "Inverse matrix not an integer matrix (det = %i).\n",
+		        det);
 		return NULL;
 	}
 
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