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) 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 scabs1 = require( '@stdlib/blas/base/scabs1' );
// MAIN //
/**
* Finds the index of the first element having maximum |Re(.)| + |Im(.)|.
*
* @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 {integer} index value
*
* @example
* var Complex64Array = require( '@stdlib/array/complex64' );
*
* var x = new Complex64Array( [ -2.0, 1.0, 3.0, -5.0, 4.0, 0.0, -1.0, -3.0 ] );
*
* var idx = icamax( x.length, x, 1, 0 );
* // returns 1
*/
function icamax( N, x, strideX, offsetX ) {
var max;
var idx;
var ix;
var v;
var i;
if ( N < 1 ) {
return -1;
}
idx = 0;
if ( N === 1 ) {
return idx;
}
max = scabs1( x.get( offsetX ) );
ix = offsetX + strideX;
for ( i = 1; i < N; i++ ) {
v = scabs1( x.get( ix ) );
if ( v > max ) {
idx = i;
max = v;
}
ix += strideX;
}
return idx;
}
// EXPORTS //
module.exports = icamax;
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