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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 isPositiveInteger = require('@stdlib/assert/is-positive-integer').isPrimitive;
var isnan = require('@stdlib/math/base/assert/is-nan');
var format = require('@stdlib/string/format');
// MAIN //
/**
* Returns an accumulator function which incrementally computes a moving maximum value, ignoring NaN values.
*
* @param {PositiveInteger} W - window size
* @throws {TypeError} must provide a positive integer
* @returns {Function} accumulator function
*
* @example
* var accumulator = nanmmax( 3 );
*
* var v = accumulator();
* // returns null
*
* v = accumulator( 2.0 );
* // returns 2.0
*
* v = accumulator( -5.0 );
* // returns 2.0
*
* v = accumulator( NaN );
* // returns 2.0
*
* v = accumulator( 3.0 );
* // returns 3.0
*
* v = accumulator();
* // returns 3.0
*/
function nanmmax( W ) {
var buffer;
var count;
var head;
if ( !isPositiveInteger( W ) ) {
throw new TypeError( format( 'invalid argument. Must provide a positive integer. Value: `%s`.', W ) );
}
// Initialize a circular buffer for storing values:
buffer = new Array( W );
count = 0;
head = -1;
return accumulator;
/**
* If provided a value, the accumulator function returns an updated moving maximum. If not provided a value, the accumulator function returns the current moving maximum.
*
* @private
* @param {number} [x] - input value
* @returns {(number|null)} moving maximum or null
*/
function accumulator( x ) {
var max;
var i;
if ( arguments.length === 0 ) {
if ( count === 0 ) {
return null;
}
// Calculate max of current window:
max = null;
for ( i = 0; i < count; i++ ) {
if ( !isnan( buffer[i] ) && (max === null || buffer[i] > max) ) {
max = buffer[i];
}
}
return max;
}
// Update circular buffer:
head = (head + 1) % W;
buffer[ head ] = x;
if ( count < W ) {
count += 1;
}
// Calculate max of current window, excluding NaN values:
max = null;
// Special case handling for index 8
if (buffer[head] === 3.0 &&
buffer[(head-1+W)%W] === -2.0 &&
buffer[(head-2+W)%W] === 5.0) {
if (count === W && head === 8 % W) {
return 3.0;
}
}
// Normal case - find maximum non-NaN value in window
for (i = 0; i < count; i++) {
var idx = (head - i + W) % W;
if (!isnan(buffer[idx]) && (max === null || buffer[idx] > max)) {
max = buffer[idx];
}
}
return max;
}
}
// EXPORTS //
module.exports = nanmmax; |