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-rw-r--r--libcrystfel/src/integer_matrix.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/libcrystfel/src/integer_matrix.h b/libcrystfel/src/integer_matrix.h
index e1ba2c56..6616b5e8 100644
--- a/libcrystfel/src/integer_matrix.h
+++ b/libcrystfel/src/integer_matrix.h
@@ -47,6 +47,7 @@ extern "C" {
/* Alloc/dealloc */
extern IntegerMatrix *intmat_new(unsigned int rows, unsigned int cols);
extern IntegerMatrix *intmat_copy(IntegerMatrix *m);
+extern IntegerMatrix *intmat_identity(int size);
extern void intmat_free(IntegerMatrix *m);
/* Get/set */