Add `clear_triplet()`
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@ -211,6 +211,26 @@ impl<T> CooMatrix<T> {
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self.values.push(v);
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}
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/// Remove a single triplet from the matrix.
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///
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/// This removes the value `v` from the `i`th row and `j`th column in the matrix.
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pub fn clear_triplet(&mut self, i: usize, j: usize, v: T) -> Option<(usize, usize, T)>
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where
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T: PartialEq,
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{
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let triple_idx = self
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.triplet_iter()
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.position(|triplet| triplet == (i, j, &v));
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if let Some(triple_idx) = triple_idx {
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self.row_indices.remove(triple_idx);
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self.col_indices.remove(triple_idx);
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let retv = self.values.remove(triple_idx);
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Some((i, j, retv))
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} else {
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None
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}
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}
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/// The number of rows in the matrix.
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#[inline]
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#[must_use]
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@ -226,6 +226,35 @@ fn coo_push_valid_entries() {
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);
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}
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#[test]
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fn coo_clear_triplet_valid_entries() {
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let mut coo = CooMatrix::new(3, 3);
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coo.push(0, 0, 1);
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coo.push(0, 0, 2);
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coo.push(2, 2, 3);
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// clear a triplet that is not included
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let triplet = coo.clear_triplet(0, 0, 0);
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assert_eq!(triplet, None);
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assert_eq!(
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coo.triplet_iter().collect::<Vec<_>>(),
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vec![(0, 0, &1), (0, 0, &2), (2, 2, &3)]
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);
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let triplet = coo.clear_triplet(0, 0, 1);
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assert_eq!(triplet, Some((0, 0, 1)));
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assert_eq!(
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coo.triplet_iter().collect::<Vec<_>>(),
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vec![(0, 0, &2), (2, 2, &3)]
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);
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let triplet = coo.clear_triplet(0, 0, 2);
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assert_eq!(triplet, Some((0, 0, 2)));
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assert_eq!(coo.triplet_iter().collect::<Vec<_>>(), vec![(2, 2, &3)]);
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let triplet = coo.clear_triplet(2, 2, 3);
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assert_eq!(triplet, Some((2, 2, 3)));
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assert_eq!(coo.triplet_iter().collect::<Vec<_>>(), vec![]);
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}
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#[test]
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fn coo_push_out_of_bounds_entries() {
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{
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