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-rw-r--r--libcrystfel/src/dirax.c15
1 files changed, 12 insertions, 3 deletions
diff --git a/libcrystfel/src/dirax.c b/libcrystfel/src/dirax.c
index 414e6406..b7fc68ea 100644
--- a/libcrystfel/src/dirax.c
+++ b/libcrystfel/src/dirax.c
@@ -3,11 +3,11 @@
*
* Invoke the DirAx auto-indexing program
*
- * Copyright © 2012 Deutsches Elektronen-Synchrotron DESY,
- * a research centre of the Helmholtz Association.
+ * Copyright © 2012-2013 Deutsches Elektronen-Synchrotron DESY,
+ * a research centre of the Helmholtz Association.
*
* Authors:
- * 2010-2012 Thomas White <taw@physics.org>
+ * 2010-2013 Thomas White <taw@physics.org>
*
* This file is part of CrystFEL.
*
@@ -631,6 +631,15 @@ IndexingPrivate *dirax_prepare(IndexingMethod indm, UnitCell *cell,
struct beam_params *beam, float *ltl)
{
struct dirax_private *dp;
+ int need_cell = 0;
+
+ if ( indm & INDEXING_CHECK_CELL_COMBINATIONS ) need_cell = 1;
+ if ( indm & INDEXING_CHECK_CELL_AXES ) need_cell = 1;
+
+ if ( need_cell && (cell == NULL) ) {
+ ERROR("DirAx needs a unit cell for this set of flags.\n");
+ return NULL;
+ }
dp = malloc(sizeof(struct dirax_private));
if ( dp == NULL ) return NULL;