All files / blas/base/dzasum/lib ndarray.js

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/**
* @license Apache-2.0
*
* Copyright (c) 2025 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 dcabs1 = require( '@stdlib/blas/base/dcabs1' );
 
 
// MAIN //
 
/**
* Computes the sum of the absolute values of each element in a double-precision complex floating-point vector.
*
* @param {PositiveInteger} N - number of indexed elements
* @param {Complex64Array} x - input array
* @param {integer} stride - `x` stride length
* @param {NonNegativeInteger} offset - starting index for `x`
* @returns {number} sum
*
* @example
* var Complex128Array = require( '@stdlib/array/complex128' );
*
* var x = new Complex128Array( [ -2.0, 1.0, 3.0, -5.0, 4.0, 0.0, -1.0, -3.0 ] );
*
* var sum = dzasum( x.length, x, 1, 0 );
* // returns 19.0
*/
function dzasum( N, x, stride, offset ) {
	var sum;
	var ix;
	var i;
 
	sum = 0.0;
	if ( N <= 0 ) {
		return sum;
	}
	ix = offset;
	for ( i = 0; i < N; i++ ) {
		sum += dcabs1( x.get( ix ) );
		ix += stride;
	}
	return sum;
}
 
 
// EXPORTS //
 
module.exports = dzasum;