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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 isColumnMajor = require( '@stdlib/ndarray/base/assert/is-column-major-string' );
var reinterpret = require( '@stdlib/strided/base/reinterpret-complex128' );
var resolveLayout = require( '@stdlib/blas/base/layout-resolve-str' );
var resolve = require( '@stdlib/blas/base/layout-resolve-enum' );
var max = require( '@stdlib/math/base/special/fast/max' );
var format = require( '@stdlib/string/format' );
var addon = require( './../src/addon.node' );
// MAIN //
/**
* Generates a double-precision complex floating-point Vandermonde matrix.
*
* @param {(integer|string)} order - storage layout
* @param {integer} mode - mode indicating whether to generate increasing or decreasing powers
* @param {NonNegativeInteger} M - number of rows in `out`
* @param {NonNegativeInteger} N - number of columns in `out`
* @param {Complex128Array} x - input array
* @param {integer} strideX - stride length for `x`
* @param {Complex128Array} out - output matrix
* @param {PositiveInteger} ldo - stride between successive contiguous vectors of the matrix `out` (a.k.a., leading dimension of the matrix `out`)
* @throws {TypeError} first argument must be a valid order
* @throws {RangeError} third argument must be a nonnegative integer
* @throws {RangeError} fourth argument must be a nonnegative integer
* @throws {RangeError} eighth argument must be a valid stride
* @returns {Complex128Array} output matrix
*
* @example
* var Complex128Array = require( '@stdlib/array/complex128' );
*
* var x = new Complex128Array( [ 1.0, 0.0, 2.0, 0.0 ] );
* var out = new Complex128Array( 6 );
*
* zvander( 'row-major', -1, 2, 3, x, 1, out, 3 );
* // out => <Complex128Array>[ 1.0, 0.0, 1.0, 0.0, 1.0, 0.0, 4.0, 0.0, 2.0, 0.0, 1.0, 0.0 ]
*/
function zvander( order, mode, M, N, x, strideX, out, ldo ) {
var k;
var l;
l = resolveLayout( order );
if ( l === null ) {
throw new TypeError( format( 'invalid argument. First argument must be a valid order. Value: `%s`.', order ) );
}
if ( M < 0 ) {
throw new RangeError( format( 'invalid argument. Third argument must be a nonnegative integer. Value: `%d`.', M ) );
}
if ( N < 0 ) {
throw new RangeError( format( 'invalid argument. Fourth argument must be a nonnegative integer. Value: `%d`.', N ) );
}
if ( isColumnMajor( l ) ) {
k = M;
} else {
k = N;
}
if ( ldo < max( 1, k ) ) {
throw new RangeError( format( 'invalid argument. Eighth argument must be greater than or equal to max(1,%d). Value: `%d`.', k, ldo ) );
}
if ( M === 0 || N === 0 ) {
return out;
}
addon( resolve( order ), mode, M, N, reinterpret( x, 0 ), strideX, reinterpret( out, 0 ), ldo );
return out;
}
// EXPORTS //
module.exports = zvander;
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