You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: svd_example_test.go
    path of file: ./repos/gonum/mat
    
    the code of the file until where you have to start completion: // Copyright ©2020 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_test

import (
	"fmt"
	"log"

	"gonum.org/v1/gonum/mat"
)

func ExampleSVD_SolveTo() {
	// The system described by A is rank deficient.
	a := mat.NewDense(5, 3, []float64{
		-1.7854591879711257, -0.42687285925779594, -0.12730256811265162,
		-0.5728984211439724, -0.10093393134001777, -0.1181901192353067,
		1.2484316018707418, 0.5646683943038734, -0.48229492403243485,
		0.10174927665169475, -0.5805410929482445, 1.3054473231942054,
		-1.134174808195733, -0.4732430202414438, 0.3528489486370508,
	})

	// Perform an SVD retaining all singular vectors.
	var svd mat.SVD
	ok := svd.Factorize(a, mat.
    
func ExampleSVD_SolveTo() {
	// The system described by A is rank deficient.
	a := mat.NewDense(5, 3, []float64{
		-1.7854591879711257, -0.42687285925779594, -0.12730256811265162,
		-0.5728984211439724, -0.10093393134001777, -0.1181901192353067,
		1.2484316018707418, 0.5646683943038734, -0.48229492403243485,
		0.10174927665169475, -0.5805410929482445, 1.3054473231942054,
		-1.134174808195733, -0.4732430202414438, 0.3528489486370508,
	})

	// Perform an SVD retaining all singular vectors.
	var svd mat.SVD
	ok := svd.Factorize(a, mat.SVDFull)
	if !ok {
		log.Fatal("failed to factorize A")
	}

	// Determine the rank of the A matrix with a near zero condition threshold.
	const rcond = 1e-15
	rank := svd.Rank(rcond)
	if rank == 0 {
		log.Fatal("zero rank system")
	}

	b := mat.NewDense(5, 2, []float64{
		-2.318, -4.35,
		-0.715, 1.451,
		1.836, -0.119,
		-0.357, 3.094,
		-1.636, 0.021,
	})

	// Find a least-squares solution using the determined parts of the system.
	var x mat.Dense
	svd.SolveTo(&x, b, rank)

	fmt.Printf("singular values = %v\nrank = %d\nx = %.15f",
		format(svd.Values(nil), 4, rcond), rank, mat.Formatted(&x, mat.Prefix("    ")))

	// Output:
	// singular values = [2.685 1.526 <1e-15]
	// rank = 2
	// x = ⎡ 1.212064313552347   1.507467451093930⎤
	//     ⎢ 0.415400738264774  -0.624498607705372⎥
	//     ⎣-0.183184442255280   2.221334193689124⎦
}