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* @license Apache-2.0
*
* Copyright (c) 2022 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 sequence over a specified interval and assigns the results to a provided output array.
*
* @private
* @param {TypedArray} out - output array
* @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 {TypedArray} linearly spaced array
*
* @example
* var Float64Array = require( '@stdlib/array/float64' );
*
* var out = new Float64Array( 6 );
* var arr = linspace( out, 0, 100, out.length, true );
* // returns <Float64Array>[ 0.0, 20.0, 40.0, 60.0, 80.0, 100.0 ]
*
* @example
* var Float64Array = require( '@stdlib/array/float64' );
*
* var out = new Float64Array( 5 );
* var arr = linspace( out, 0, 100, out.length, false );
* // returns <Float64Array>[ 0.0, 20.0, 40.0, 60.0, 80.0 ]
*/
function linspace( out, start, stop, len, endpoint ) {
var N;
var d;
var i;
if ( len === 0 ) {
return out;
}
// Set the first value:
if ( len === 1 ) {
if ( endpoint ) {
out[ 0 ] = stop;
} else {
out[ 0 ] = start;
}
return out;
}
out[ 0 ] = 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++ ) {
out[ i ] = start + (d*i);
}
// Check whether to include the `stop` value in the output array:
if ( endpoint ) {
out[ N ] = stop;
}
return out;
}
// EXPORTS //
module.exports = linspace;
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