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* @license Apache-2.0
*
* Copyright (c) 2026 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 isnan = require( '@stdlib/math/base/assert/is-nan' );
var isPositiveZero = require( '@stdlib/math/base/assert/is-positive-zero' );
// MAIN //
/**
* Computes the cumulative maximum of a strided array, ignoring `NaN` values.
*
* @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 - stride length
* @param {NonNegativeInteger} offsetX - starting index
* @param {Object} y - output array object
* @param {Collection} y.data - output array data
* @param {Array<Function>} y.accessors - array element accessors
* @param {integer} strideY - stride length
* @param {NonNegativeInteger} offsetY - starting index
* @returns {Object} output array object
*
* @example
* var toAccessorArray = require( '@stdlib/array/base/to-accessor-array' );
* var arraylike2object = require( '@stdlib/array/base/arraylike2object' );
*
* var x = toAccessorArray( [ 2.0, 1.0, 2.0, -2.0, NaN, 4.0 ] );
* var y = toAccessorArray( [ 0.0, 0.0, 0.0, 0.0, 0.0, 0.0 ] );
*
* var v = nancumax( 6, arraylike2object( x ), 1, 0, arraylike2object( y ), 1, 0 );
* // returns <Object>
*/
function nancumax( N, x, strideX, offsetX, y, strideY, offsetY ) {
var xbuf;
var ybuf;
var xget;
var yset;
var max;
var ix;
var iy;
var v;
var i;
// Cache references to array data:
xbuf = x.data;
ybuf = y.data;
// Cache references to element accessors:
xget = x.accessors[ 0 ];
yset = y.accessors[ 1 ];
if ( N <= 0 ) {
return y;
}
ix = offsetX;
iy = offsetY;
max = -Infinity;
for ( i = 0; i < N; i++ ) {
v = xget( xbuf, ix );
if ( isnan( v ) === false ) {
if ( v > max || ( v === max && isPositiveZero( v ) ) ) {
max = v;
}
}
yset( ybuf, iy, max );
ix += strideX;
iy += strideY;
}
return y;
}
// EXPORTS //
module.exports = nancumax;
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