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-rw-r--r--libcrystfel/src/cell-utils.c8
1 files changed, 6 insertions, 2 deletions
diff --git a/libcrystfel/src/cell-utils.c b/libcrystfel/src/cell-utils.c
index 2580f3fb..b207afe7 100644
--- a/libcrystfel/src/cell-utils.c
+++ b/libcrystfel/src/cell-utils.c
@@ -1811,12 +1811,14 @@ int compare_permuted_cell_parameters_and_orientation(UnitCell *cell,
UnitCell *nc;
int j, k;
int l = 0;
+ signed int det;
for ( j=0; j<3; j++ )
for ( k=0; k<3; k++ )
intmat_set(m, j, k, i[l++]);
- if ( intmat_det(m) != +1 ) continue;
+ det = intmat_det(m);
+ if ( (det != +1) && (det != -1) ) continue;
nc = cell_transform_intmat(cell, m);
@@ -2179,12 +2181,14 @@ int compare_permuted_cell_parameters(UnitCell *cell, UnitCell *reference,
UnitCell *test;
int j, k;
int l = 0;
+ signed int det;
for ( j=0; j<3; j++ )
for ( k=0; k<3; k++ )
intmat_set(m, j, k, i[l++]);
- if ( intmat_det(m) != +1 ) continue;
+ det = intmat_det(m);
+ if ( (det != +1) && (det != -1) ) continue;
test = cell_transform_intmat(cell, m);