Press n or j to go to the next uncovered block, b, p or k for the previous block.
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* @license Apache-2.0
*
* Copyright (c) 2018 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 abs = require( '@stdlib/math/base/special/abs' );
// MAIN //
/**
* Computes the sum of absolute values.
*
* @param {PositiveInteger} N - number of indexed elements
* @param {Float64Array} x - input array
* @param {integer} stride - `x` stride length
* @param {NonNegativeInteger} offset - starting index for `x`
* @returns {number} sum
*
* @example
* var Float64Array = require( '@stdlib/array/float64' );
*
* var x = new Float64Array( [ 1.0, -2.0, 3.0, -4.0, 5.0 ] );
*
* var s = dasum( x.length, x, 1, 0 );
* // returns 15.0
*/
function dasum( 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 += abs( x[ix] );
ix += stride;
}
return sum;
}
// EXPORTS //
module.exports = dasum;
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