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-rw-r--r--libcrystfel/src/rational.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/libcrystfel/src/rational.h b/libcrystfel/src/rational.h
index e67c603a..8681bb06 100644
--- a/libcrystfel/src/rational.h
+++ b/libcrystfel/src/rational.h
@@ -100,6 +100,8 @@ extern void transform_fractional_coords_rtnl_inverse(const RationalMatrix *P,
Rational *ans);
extern void rtnl_mtx_print(const RationalMatrix *m);
extern Rational rtnl_mtx_det(const RationalMatrix *m);
+extern int rtnl_mtx_is_identity(const RationalMatrix *m);
+extern int rtnl_mtx_is_perm(const RationalMatrix *m);
#ifdef __cplusplus
}