<!-- @license Apache-2.0 Copyright (c) 2018 The Stdlib Authors. Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License. --> # isSkewCentrosymmetricMatrix > Test if a value is a [skew-centrosymmetric matrix][centrosymmetric-matrix]. <section class="usage"> ## Usage <!-- eslint-disable id-length --> ```javascript var isSkewCentrosymmetricMatrix = require( '@stdlib/assert/is-skew-centrosymmetric-matrix' ); ``` #### isSkewCentrosymmetricMatrix( value ) Tests if a value is a [skew-centrosymmetric matrix][centrosymmetric-matrix]. <!-- eslint-disable id-length --> <!-- eslint-disable array-element-newline --> ```javascript var ndarray = require( '@stdlib/ndarray/ctor' ); var buffer = [ 1, 2, 3, 4, 0, -4, -3, -2, -1 ]; var arr = ndarray( 'generic', buffer, [ 3, 3 ], [ 3, 1 ], 0, 'row-major' ); var bool = isSkewCentrosymmetricMatrix( arr ); // returns true ``` </section> <!-- /.usage --> <section class="examples"> ## Examples <!-- eslint no-undef: "error" --> <!-- eslint-disable id-length --> ```javascript var ndarray = require( '@stdlib/ndarray/ctor' ); var isSkewCentrosymmetricMatrix = require( '@stdlib/assert/is-skew-centrosymmetric-matrix' ); var arr = ndarray( 'generic', [ 2, 1, -1, -2 ], [ 2, 2 ], [ 2, 1 ], 0, 'row-major' ); var out = isSkewCentrosymmetricMatrix( arr ); // returns true out = isSkewCentrosymmetricMatrix( [ 1, 2, 3, 4 ] ); // returns false out = isSkewCentrosymmetricMatrix( {} ); // returns false out = isSkewCentrosymmetricMatrix( null ); // returns false ``` </section> <!-- /.examples --> <section class="links"> [centrosymmetric-matrix]: https://en.wikipedia.org/wiki/Centrosymmetric_matrix </section> <!-- /.links -->