Press n or j to go to the next uncovered block, b, p or k for the previous block.
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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';
// MODULES //
var pow = require( '@stdlib/math/base/special/pow' );
// MAIN //
/**
* Generates a logarithmically spaced numeric array.
*
* @param {number} a - exponent of start value
* @param {number} b - exponent of end value
* @param {NonNegativeInteger} len - length of output array
* @returns {Array} logarithmically spaced numeric array
*
* @example
* var arr = logspace( 0, 2, 6 );
* // returns [ 1, ~2.5, ~6.31, ~15.85, ~39.81, 100 ]
*/
function logspace( a, b, len ) {
var arr;
var N;
var d;
var i;
if ( len === 0 ) {
return [];
}
// Calculate the increment:
N = len - 1;
d = ( b-a ) / N;
// Build the output array...
arr = [ pow( 10, a ) ];
for ( i = 1; i < N; i++ ) {
arr.push( pow( 10, a+(d*i) ) );
}
arr.push( pow( 10, b ) );
return arr;
}
// EXPORTS //
module.exports = logspace;
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