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* @license Apache-2.0
*
* Copyright (c) 2024 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 absf = require( '@stdlib/math/base/special/absf' );
var reinterpret = require( '@stdlib/strided/base/reinterpret-complex64' );
var f32 = require( '@stdlib/number/float64/base/to-float32' );
// MAIN //
/**
* Computes the sum of the absolute values of the real and imaginary components of a single-precision complex floating-point vector.
*
* @param {PositiveInteger} N - number of indexed elements
* @param {Complex64Array} x - input array
* @param {integer} strideX - `x` stride length
* @param {NonNegativeInteger} offsetX - starting index for `x`
* @returns {number} result
*
* @example
* var Complex64Array = require( '@stdlib/array/complex64' );
*
* var x = new Complex64Array( [ 5.0, -3.0, 6.0, 4.0 ] );
*
* var out = scasum( x.length, x, 1, 0 );
* // returns 18.0
*/
function scasum( N, x, strideX, offsetX ) {
var stemp;
var viewX;
var ix;
var sx;
var i;
stemp = 0.0;
if ( N <= 0 ) {
return stemp;
}
viewX = reinterpret( x, 0 );
sx = strideX * 2;
ix = offsetX * 2;
for ( i = 0; i < N; i++ ) {
stemp = f32( stemp + f32( absf( viewX[ ix ] ) + absf( viewX[ ix+1 ] ) ) );
ix += sx;
}
return stemp;
}
// EXPORTS //
module.exports = scasum;
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