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* @license Apache-2.0
*
* Copyright (c) 2026 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 dtypes = require( '@stdlib/ndarray/dtypes' );
var gscal = require( '@stdlib/blas/base/ndarray/gscal' );
var dscal = require( '@stdlib/blas/base/ndarray/dscal' );
var sscal = require( '@stdlib/blas/base/ndarray/sscal' );
var zscal = require( '@stdlib/blas/base/ndarray/zscal' );
var cscal = require( '@stdlib/blas/base/ndarray/cscal' );
var factory = require( '@stdlib/ndarray/base/nullary-strided1d-dispatch-factory' );
// VARIABLES //
var idtypes0 = dtypes( 'numeric_and_generic' ); // input ndarray
var idtypes1 = dtypes( 'numeric_and_generic' ); // alpha ndarray
var odtypes = dtypes( 'numeric_and_generic' );
var table = {
'types': [
'float64', // input/output
'float32', // input/output
'complex128', // input/output
'complex64' // input/output
// NOTE: we cannot support dispatch to specialized kernels, such as `csscal` and `zdscal`, as dispatch is based solely on the data type of the input ndarray and `alpha` must be cast to the data type of the input ndarray
],
'fcns': [
dscal,
sscal,
zscal,
cscal
],
'default': gscal
};
var options = {
'strictTraversalOrder': true
};
// MAIN //
/**
* Multiplies an input ndarray by a scalar constant along one or more ndarray dimensions.
*
* @private
* @name scal
* @type {Function}
* @param {ndarray} x - input ndarray
* @param {ndarray} alpha - ndarray containing the scalar constant
* @param {Options} [options] - function options
* @param {IntegerArray} [options.dims] - list of dimensions over which to perform operation
* @throws {TypeError} first argument must be an ndarray-like object
* @throws {TypeError} second argument must be an ndarray-like object
* @throws {TypeError} options argument must be an object
* @throws {RangeError} dimension indices must not exceed input ndarray bounds
* @throws {RangeError} number of dimension indices must not exceed the number of input ndarray dimensions
* @throws {Error} must provide valid options
* @returns {ndarray} input ndarray
*
* @example
* var array = require( '@stdlib/ndarray/array' );
* var scalar2ndarray = require( '@stdlib/ndarray/from-scalar' );
*
* var x = array( [ 1.0, 2.0, 3.0, 4.0, 5.0 ] );
* // returns <ndarray>[ 1.0, 2.0, 3.0, 4.0, 5.0 ]
*
* var alpha = scalar2ndarray( 5.0, {
* 'dtype': 'float64'
* });
*
* var out = scal( x, alpha );
* // returns <ndarray>[ 5.0, 10.0, 15.0, 20.0, 25.0 ]
*/
var scal = factory( table, [ idtypes0, idtypes1 ], odtypes, options );
// EXPORTS //
module.exports = scal;
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