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) 2026 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 arraylike2object = require( '@stdlib/array/base/arraylike2object' );
var pow = require( '@stdlib/math/base/special/pow' );
var accessors = require( './accessors.js' );
// MAIN //
/**
* Fills a strided array with logarithmically spaced values over a specified interval.
*
* @param {PositiveInteger} N - number of indexed elements
* @param {number} base - base of the logarithmic scale
* @param {number} start - exponent of the starting value
* @param {number} stop - exponent of the final value
* @param {boolean} endpoint - boolean indicating whether to include the `base^stop` value when writing values to the input array
* @param {Collection} x - input array
* @param {integer} strideX - stride length
* @param {NonNegativeInteger} offsetX - starting index
* @returns {Collection} input array
*
* @example
* var x = [ 0.0, 0.0, 0.0, 0.0, 0.0, 0.0 ];
*
* glogspace( x.length, 10.0, 0.0, 5.0, true, x, 1, 0 );
* // x => [ 1.0, 10.0, 100.0, 1000.0, 10000.0, 100000.0 ]
*
* @example
* var x = [ 0.0, 0.0, 0.0, 0.0, 0.0 ];
*
* glogspace( x.length, 10.0, 0.0, 5.0, false, x, 1, 0 );
* // x => [ 1.0, 10.0, 100.0, 1000.0, 10000.0 ]
*/
function glogspace( N, base, start, stop, endpoint, x, strideX, offsetX ) {
var ix;
var d;
var o;
var i;
if ( N <= 0 ) {
return x;
}
o = arraylike2object( x );
if ( o.accessorProtocol ) {
accessors( N, base, start, stop, endpoint, o, strideX, offsetX );
return x;
}
ix = offsetX;
// Set the first value:
if ( N === 1 ) {
if ( endpoint ) {
x[ ix ] = pow( base, stop );
} else {
x[ ix ] = pow( base, start );
}
return x;
}
x[ ix ] = pow( base, start );
ix += strideX;
// Calculate the increment:
if ( endpoint ) {
N -= 1;
}
d = ( stop-start ) / N;
// Generate logarithmically spaced values:
for ( i = 1; i < N; i++ ) {
x[ ix ] = pow( base, start + (d*i) );
ix += strideX;
}
// Check whether to include the `base^stop` value:
if ( endpoint ) {
x[ ix ] = pow( base, stop );
}
return x;
}
// EXPORTS //
module.exports = glogspace;
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