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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 isArrayLike = require( '@stdlib/assert/is-array-like-object' );
var format = require( '@stdlib/string/format' );
var isnan = require( '@stdlib/math/base/assert/is-nan' );
var PINF = require( '@stdlib/constants/float64/pinf' );
var abs = require( '@stdlib/math/base/special/abs' );
// MAIN //
/**
* Returns an accumulator function which incrementally computes minimum and maximum absolute values.
*
* @param {Collection} [out] - output array
* @throws {TypeError} output argument must be array-like
* @returns {Function} accumulator function
*
* @example
* var accumulator = incrminmaxabs();
*
* var mm = accumulator();
* // returns null
*
* mm = accumulator( 2.0 );
* // returns [ 2.0, 2.0 ]
*
* mm = accumulator( -5.0 );
* // returns [ 2.0, 5.0 ]
*
* mm = accumulator( 3.0 );
* // returns [ 2.0, 5.0 ]
*
* mm = accumulator( 5.0 );
* // returns [ 2.0, 5.0 ]
*
* mm = accumulator();
* // returns [ 2.0, 5.0 ]
*/
function incrminmaxabs( out ) {
var minmax;
var min;
var max;
var FLG;
if ( arguments.length === 0 ) {
minmax = [ 0.0, 0.0 ];
} else {
if ( !isArrayLike( out ) ) {
throw new TypeError( format( 'invalid argument. Output argument must be an array-like object. Value: `%s`.', out ) );
}
minmax = out;
}
min = PINF;
max = 0.0;
FLG = false;
return accumulator;
/**
* If provided a value, the accumulator function returns updated minimum and maximum absolute values. If not provided a value, the accumulator function returns the current minimum and maximum absolute values.
*
* @private
* @param {number} [x] - input value
* @returns {(ArrayLikeObject|null)} output array or null
*/
function accumulator( x ) {
var ax;
if ( arguments.length === 0 ) {
if ( FLG === false ) {
return null;
}
minmax[ 0 ] = min; // Why? Because we cannot guarantee someone hasn't mutated the output array
minmax[ 1 ] = max;
return minmax;
}
FLG = true;
if ( isnan( x ) ) {
min = x;
max = x;
} else {
ax = abs( x );
if ( ax < min ) {
min = ax;
}
if ( ax > max ) {
max = ax;
}
}
minmax[ 0 ] = min;
minmax[ 1 ] = max;
return minmax;
}
}
// EXPORTS //
module.exports = incrminmaxabs;
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