Merge pull request #201 from Bytom/v0.1

[bytom/vapor.git] / vendor / gonum.org / v1 / gonum / lapack / gonum / dlaqr1.go

diff --git a/vendor/gonum.org/v1/gonum/lapack/gonum/dlaqr1.go b/vendor/gonum.org/v1/gonum/lapack/gonum/dlaqr1.go
deleted file mode 100644 (file)
index 493b8e4..0000000
--- a/vendor/gonum.org/v1/gonum/lapack/gonum/dlaqr1.go
+++ /dev/null
@@ -1,57 +0,0 @@
-// 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 gonum
-
-import "math"
-
-// Dlaqr1 sets v to a scalar multiple of the first column of the product
-//  (H - (sr1 + i*si1)*I)*(H - (sr2 + i*si2)*I)
-// where H is a 2×2 or 3×3 matrix, I is the identity matrix of the same size,
-// and i is the imaginary unit. Scaling is done to avoid overflows and most
-// underflows.
-//
-// n is the order of H and must be either 2 or 3. It must hold that either sr1 =
-// sr2 and si1 = -si2, or si1 = si2 = 0. The length of v must be equal to n. If
-// any of these conditions is not met, Dlaqr1 will panic.
-//
-// Dlaqr1 is an internal routine. It is exported for testing purposes.
-func (impl Implementation) Dlaqr1(n int, h []float64, ldh int, sr1, si1, sr2, si2 float64, v []float64) {
-       if n != 2 && n != 3 {
-               panic(badDims)
-       }
-       checkMatrix(n, n, h, ldh)
-       if len(v) != n {
-               panic(badSlice)
-       }
-       if !((sr1 == sr2 && si1 == -si2) || (si1 == 0 && si2 == 0)) {
-               panic(badShifts)
-       }
-
-       if n == 2 {
-               s := math.Abs(h[0]-sr2) + math.Abs(si2) + math.Abs(h[ldh])
-               if s == 0 {
-                       v[0] = 0
-                       v[1] = 0
-               } else {
-                       h21s := h[ldh] / s
-                       v[0] = h21s*h[1] + (h[0]-sr1)*((h[0]-sr2)/s) - si1*(si2/s)
-                       v[1] = h21s * (h[0] + h[ldh+1] - sr1 - sr2)
-               }
-               return
-       }
-
-       s := math.Abs(h[0]-sr2) + math.Abs(si2) + math.Abs(h[ldh]) + math.Abs(h[2*ldh])
-       if s == 0 {
-               v[0] = 0
-               v[1] = 0
-               v[2] = 0
-       } else {
-               h21s := h[ldh] / s
-               h31s := h[2*ldh] / s
-               v[0] = (h[0]-sr1)*((h[0]-sr2)/s) - si1*(si2/s) + h[1]*h21s + h[2]*h31s
-               v[1] = h21s*(h[0]+h[ldh+1]-sr1-sr2) + h[ldh+2]*h31s
-               v[2] = h31s*(h[0]+h[2*ldh+2]-sr1-sr2) + h21s*h[2*ldh+1]
-       }
-}