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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 ndarraylike2scalar = require( '@stdlib/ndarray/base/ndarraylike2scalar' );
var numelDimension = require( '@stdlib/ndarray/base/numel-dimension' );
var getStrides = require( '@stdlib/ndarray/base/strides' );
var getStride = require( '@stdlib/ndarray/base/stride' );
var getOffset = require( '@stdlib/ndarray/base/offset' );
var getData = require( '@stdlib/ndarray/base/data-buffer' );
var strided = require( '@stdlib/blas/ext/base/dvander' ).ndarray;
// MAIN //
/**
* Generates a double-precision floating-point Vandermonde matrix.
*
* ## Notes
*
* - The function expects the following ndarrays:
*
* - a one-dimensional input ndarray.
* - a two-dimensional output ndarray.
* - a zero-dimensional ndarray specifying the mode.
*
* @param {ArrayLikeObject<Object>} arrays - array-like object containing ndarrays
* @returns {Object} output ndarray
*
* @example
* var Float64Vector = require( '@stdlib/ndarray/vector/float64' );
* var zeros = require( '@stdlib/ndarray/zeros' );
* var scalar2ndarray = require( '@stdlib/ndarray/from-scalar' );
*
* var x = new Float64Vector( [ 1.0, 2.0, 3.0 ] );
* var out = zeros( [ 3, 3 ], {
* 'dtype': 'float64'
* });
*
* var mode = scalar2ndarray( 1, {
* 'dtype': 'float64'
* });
*
* var v = dvander( [ x, out, mode ] );
* // returns <ndarray>[ [ 1.0, 1.0, 1.0 ], [ 1.0, 2.0, 4.0 ], [ 1.0, 3.0, 9.0 ] ]
*
* var bool = ( v === out );
* // returns true
*/
function dvander( arrays ) {
var mode;
var out;
var so;
var x;
x = arrays[ 0 ];
out = arrays[ 1 ];
mode = ndarraylike2scalar( arrays[ 2 ] );
so = getStrides( out, false );
strided( mode, numelDimension( out, 0 ), numelDimension( out, 1 ), getData( x ), getStride( x, 0 ), getOffset( x ), getData( out ), so[ 0 ], so[ 1 ], getOffset( out ) ); // eslint-disable-line max-len
return out;
}
// EXPORTS //
module.exports = dvander;
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