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[bytom/vapor.git] / vendor / gonum.org / v1 / gonum / mat / consts.go

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+// Copyright ©2016 The Gonum Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package mat
+
+// TriKind represents the triangularity of the matrix.
+type TriKind bool
+
+const (
+       // Upper specifies an upper triangular matrix.
+       Upper TriKind = true
+       // Lower specifies a lower triangular matrix.
+       Lower TriKind = false
+)
+
+// SVDKind specifies the treatment of singular vectors during an SVD
+// factorization.
+type SVDKind int
+
+const (
+       // SVDNone specifies that no singular vectors should be computed during
+       // the decomposition.
+       SVDNone SVDKind = iota + 1
+       // SVDThin computes the thin singular vectors, that is, it computes
+       //  A = U~ * Σ * V~^T
+       // where U~ is of size m×min(m,n), Σ is a diagonal matrix of size min(m,n)×min(m,n)
+       // and V~ is of size n×min(m,n).
+       SVDThin
+       // SVDFull computes the full singular value decomposition,
+       //  A = U * Σ * V^T
+       // where U is of size m×m, Σ is an m×n diagonal matrix, and V is an n×n matrix.
+       SVDFull
+)
+
+// GSVDKind specifies the treatment of singular vectors during a GSVD
+// factorization.
+type GSVDKind int
+
+const (
+       // GSVDU specifies that the U singular vectors should be computed during
+       // the decomposition.
+       GSVDU GSVDKind = 1 << iota
+       // GSVDV specifies that the V singular vectors should be computed during
+       // the decomposition.
+       GSVDV
+       // GSVDQ specifies that the Q singular vectors should be computed during
+       // the decomposition.
+       GSVDQ
+
+       // GSVDNone specifies that no singular vector should be computed during
+       // the decomposition.
+       GSVDNone
+)