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// 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 mat_test
import (
"fmt"
"gonum.org/v1/gonum/mat"
)
func ExampleSymDense_SubsetSym() {
n := 5
s := mat.NewSymDense(5, nil)
count := 1.0
for i := 0; i < n; i++ {
for j := i; j < n; j++ {
s.SetSym(i, j, count)
count++
}
}
fmt.Println("Original matrix:")
fmt.Printf("%0.4v\n\n", mat.Formatted(s))
// Take the subset {0, 2, 4}
var sub mat.SymDense
sub.SubsetSym(s, []int{0, 2, 4})
fmt.Println("Subset {0, 2, 4}")
fmt.Printf("%0.4v\n\n", mat.Formatted(&sub))
// Take the subset {0, 0, 4}
sub.SubsetSym(s, []int{0, 0, 4})
fmt.Println("Subset {0, 0, 4}")
fmt.Printf("%0.4v\n\n", mat.Formatted(&sub))
// Output:
// Original matrix:
// ⎡ 1 2 3 4 5⎤
// ⎢ 2 6 7 8 9⎥
// ⎢ 3 7 10 11 12⎥
// ⎢ 4 8 11 13 14⎥
// ⎣ 5 9 12 14 15⎦
//
// Subset {0, 2, 4}
// ⎡ 1 3 5⎤
// ⎢ 3 10 12⎥
// ⎣ 5 12 15⎦
//
// Subset {0, 0, 4}
// ⎡ 1 1 5⎤
// ⎢ 1 1 5⎥
// ⎣ 5 5 15⎦
}
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