Add intmat_zero

2 files changed, 8 insertions, 0 deletions

diff --git a/libcrystfel/src/integer_matrix.c b/libcrystfel/src/integer_matrix.c
index 9431d189..c633a620 100644
--- a/libcrystfel/src/integer_matrix.c
+++ b/libcrystfel/src/integer_matrix.c
@@ -247,6 +247,12 @@ IntegerMatrix *intmat_intmat_mult(const IntegerMatrix *a,
 }
 
 
+void intmat_zero(IntegerMatrix *m)
+{
+	memset(m->v, 0, m->rows*m->cols*sizeof(signed int));
+}
+
+
 static IntegerMatrix *delete_row_and_column(const IntegerMatrix *m,
                                             unsigned int di, unsigned int dj)
 {
diff --git a/libcrystfel/src/integer_matrix.h b/libcrystfel/src/integer_matrix.h
index dcbe63bc..5a365f0a 100644
--- a/libcrystfel/src/integer_matrix.h
+++ b/libcrystfel/src/integer_matrix.h
@@ -64,6 +64,8 @@ extern void intmat_set(IntegerMatrix *m, unsigned int i, unsigned int j,
 extern signed int intmat_get(const IntegerMatrix *m,
                              unsigned int i, unsigned int j);
 
+extern void intmat_zero(IntegerMatrix *m);
+
 extern IntegerMatrix *intmat_create_3x3(signed int m11, signed int m12, signed int m13,
                                         signed int m21, signed int m22, signed int m23,
                                         signed int m31, signed int m32, signed int m33);