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mat: add IsZero method to resetable types

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kortschak
2017-06-21 09:58:26 +09:30
committed by Dan Kortschak
parent 08e1f7dfc1
commit 01a0286e0f
9 changed files with 45 additions and 24 deletions
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8
mat/triangular.go
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@@ -135,7 +135,7 @@ func (t *TriDense) Dims() (r, c int) {
// Triangle returns the dimension of t and its orientation. The returned
// orientation is only valid when n is not zero.
func (t *TriDense) Triangle() (n int, kind TriKind) {
return t.mat.N, TriKind(!t.isZero()) && t.triKind()
return t.mat.N, TriKind(!t.IsZero()) && t.triKind()
}
func (t *TriDense) isUpper() bool {
@@ -200,7 +200,9 @@ func (t *TriDense) Reset() {
t.mat.Data = t.mat.Data[:0]
}
func (t *TriDense) isZero() bool {
// IsZero returns whether the receiver is zero-sized. Zero-sized matrices can be the
// receiver for size-restricted operations. TriDense matrices can be zeroed using Reset.
func (t *TriDense) IsZero() bool {
// It must be the case that t.Dims() returns
// zeros in this case. See comment in Reset().
return t.mat.Stride == 0
@@ -227,7 +229,7 @@ func (t *TriDense) reuseAs(n int, kind TriKind) {
if t.mat.N > t.cap {
panic(badTriCap)
}
if t.isZero() {
if t.IsZero() {
t.mat = blas64.Triangular{
N: n,
Stride: n,