forked from LaconicNetwork/kompose
32 lines
912 B
Go
32 lines
912 B
Go
// Copyright ©2015 The gonum Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package native
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import (
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"github.com/gonum/blas"
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"github.com/gonum/blas/blas64"
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)
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// Dtrtrs solves a triangular system of the form a * x = b or a^T * x = b. Dtrtrs
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// checks for singularity in a. If a is singular, false is returned and no solve
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// is performed. True is returned otherwise.
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func (impl Implementation) Dtrtrs(uplo blas.Uplo, trans blas.Transpose, diag blas.Diag, n, nrhs int, a []float64, lda int, b []float64, ldb int) (ok bool) {
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nounit := diag == blas.NonUnit
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if n == 0 {
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return false
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}
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// Check for singularity.
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if nounit {
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for i := 0; i < n; i++ {
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if a[i*lda+i] == 0 {
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return false
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}
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}
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}
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bi := blas64.Implementation()
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bi.Dtrsm(blas.Left, uplo, trans, diag, n, nrhs, 1, a, lda, b, ldb)
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return true
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}
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