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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 abs = require( '@stdlib/math/base/special/abs' );
// MAIN //
/**
* Finds the index of the first element having the maximum absolute value.
*
* @private
* @param {PositiveInteger} N - number of indexed elements
* @param {Object} x - input array object
* @param {Collection} x.data - input array data
* @param {Array<Function>} x.accessors - array element accessors
* @param {integer} strideX - `x` stride length
* @param {NonNegativeInteger} offsetX - starting `x` index
* @returns {integer} index value
*
* @example
* var toAccessorArray = require( '@stdlib/array/base/to-accessor-array' );
* var arraylike2object = require( '@stdlib/array/base/arraylike2object' );
*
* var x = [ 1.0, 2.0, 3.0, 4.0, 5.0 ];
*
* var idx = igamax( 5, arraylike2object( toAccessorArray( x ) ), 1, 0 );
* // returns 4
*/
function igamax( N, x, strideX, offsetX ) {
var dmax;
var xbuf;
var idx;
var get;
var ix;
var i;
var v;
// Cache references to array data:
xbuf = x.data;
// Cache references to element accessors:
get = x.accessors[ 0 ];
idx = 0;
if ( N === 1 ) {
return idx;
}
dmax = abs( get( xbuf, offsetX ) );
ix = offsetX + strideX;
for ( i = 1; i < N; i++ ) {
v = abs( get( xbuf, ix ) );
if ( v > dmax ) {
idx = i;
dmax = v;
}
ix += strideX;
}
return idx;
}
// EXPORTS //
module.exports = igamax;
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