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* @license Apache-2.0
*
* Copyright (c) 2021 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';
// MAIN //
/**
* Generates a linearly spaced array over a specified interval.
*
* @private
* @param {number} start - start of interval
* @param {number} stop - end of interval
* @param {NonNegativeInteger} len - length of output array
* @param {boolean} endpoint - boolean indicating whether to include `stop` in the output array
* @returns {Array} linearly spaced array
*
* @example
* var arr = linspace( 0, 100, 6, true );
* // returns [ 0, 20, 40, 60, 80, 100 ]
*
* @example
* var arr = linspace( 0, 100, 5, false );
* // returns [ 0, 20, 40, 60, 80 ]
*/
function linspace( start, stop, len, endpoint ) {
var arr;
var N;
var d;
var i;
if ( len === 0 ) {
return [];
}
// Set the first value:
if ( len === 1 ) {
if ( endpoint ) {
return [ stop ];
}
return [ start ];
}
arr = [ start ];
// Calculate the increment:
if ( endpoint ) {
N = len - 1;
} else {
N = len;
}
d = ( stop-start ) / N;
// Generate linearly spaced values:
for ( i = 1; i < N; i++ ) {
arr.push( start + (d*i) );
}
// Check whether to include the `stop` value in the output array:
if ( endpoint ) {
arr.push( stop );
}
return arr;
}
// EXPORTS //
module.exports = linspace;
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