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* @license Apache-2.0
*
* Copyright (c) 2022 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.
*/
'use strict';
// MODULES //
var shape2strides = require( '@stdlib/ndarray/base/shape2strides' );
var strides2offset = require( '@stdlib/ndarray/base/strides2offset' );
var buffer = require( '@stdlib/ndarray/base/buffer' );
var numel = require( '@stdlib/ndarray/base/numel' );
var getDType = require( '@stdlib/ndarray/base/dtype' );
var getShape = require( '@stdlib/ndarray/base/shape' );
var getOrder = require( '@stdlib/ndarray/base/order' );
var format = require( '@stdlib/string/format' );
// MAIN //
/**
* Creates a zero-filled ndarray having the same shape and data type as a provided ndarray.
*
* @param {ndarray} x - input array
* @throws {TypeError} first argument must have a recognized data type
* @returns {ndarray} ndarray
*
* @example
* var zeros = require( '@stdlib/ndarray/base/zeros' );
*
* var x = zeros( 'float32', [ 2, 2 ], 'row-major' );
* // returns <ndarray>
*
* var y = zerosLike( x );
* // returns <ndarray>
*
* var sh = y.shape;
* // returns [ 2, 2 ]
*
* var dt = y.dtype;
* // returns 'float32'
*/
function zerosLike( x ) {
var ndims;
var len;
var buf;
var ord;
var sh;
var st;
var dt;
dt = getDType( x );
sh = getShape( x, true );
ord = getOrder( x );
ndims = sh.length;
if ( ndims > 0 ) {
len = numel( sh );
st = shape2strides( sh, ord );
} else {
// For 0-dimensional arrays, the buffer should contain a single element...
len = 1;
st = [ 0 ];
}
buf = buffer( dt, len );
if ( buf === null ) {
throw new TypeError( format( 'invalid argument. First argument must have a recognized data type. Value: `%s`.', dt ) );
}
return new x.constructor( dt, buf, sh, st, strides2offset( sh, st ), ord );
}
// EXPORTS //
module.exports = zerosLike;
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