Add dependencies for code generator

vendor/gonum.org/v1/gonum/lapack/gonum/dlassq.go

@@ -0,0 +1,41 @@
+// Copyright ©2015 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"
+
+// Dlassq updates a sum of squares in scaled form. The input parameters scale and
+// sumsq represent the current scale and total sum of squares. These values are
+// updated with the information in the first n elements of the vector specified
+// by x and incX.
+//
+// Dlassq is an internal routine. It is exported for testing purposes.
+func (impl Implementation) Dlassq(n int, x []float64, incx int, scale float64, sumsq float64) (scl, smsq float64) {
+	switch {
+	case n < 0:
+		panic(nLT0)
+	case incx <= 0:
+		panic(badIncX)
+	case len(x) < 1+(n-1)*incx:
+		panic(shortX)
+	}
+
+	if n == 0 {
+		return scale, sumsq
+	}
+
+	for ix := 0; ix <= (n-1)*incx; ix += incx {
+		absxi := math.Abs(x[ix])
+		if absxi > 0 || math.IsNaN(absxi) {
+			if scale < absxi {
+				sumsq = 1 + sumsq*(scale/absxi)*(scale/absxi)
+				scale = absxi
+			} else {
+				sumsq += (absxi / scale) * (absxi / scale)
+			}
+		}
+	}
+	return scale, sumsq
+}