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* @license Apache-2.0
*
* Copyright (c) 2025 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 two-dimensional nested numeric array.
*
* @param {number} start - first array value
* @param {number} stop - last array value
* @param {NonNegativeIntegerArray} shape - array shape
* @param {boolean} colexicographic - specifies whether generated array values should be stored in colexicographic order
* @returns {Array} linearly spaced two-dimensional nested numeric array
*
* @example
* var x = linspace2d( 0, 100, [ 2, 3 ], false );
* // returns [ [ 0, 20, 40 ], [ 60, 80, 100 ] ]
*
* x = linspace2d( 0, 100, [ 2, 3 ], true );
* // returns [ [ 0, 40, 80 ], [ 20, 60, 100 ] ]
*/
function linspace2d( start, stop, shape, colexicographic ) {
var inc0;
var inc1;
var out;
var tmp;
var idx;
var s0;
var i0;
var s1;
var i1;
var d;
var n;
s0 = shape[ 1 ];
s1 = shape[ 0 ];
n = s0 * s1;
if ( n === 0 ) {
return [];
}
d = ( stop - start ) / ( n - 1 );
if ( colexicographic ) {
inc0 = s1; // index increment for the innermost loop
inc1 = 1 - ( s0 * inc0 ); // index increment for the outermost loop
} else {
inc0 = 1; // index increment for the innermost loop
inc1 = 0; // index increment for the outermost loop
}
out = [];
idx = 0;
for ( i1 = 0; i1 < s1; i1++ ) {
tmp = [];
for ( i0 = 0; i0 < s0; i0++ ) {
tmp.push( start + ( idx * d ) );
idx += inc0;
}
out.push( tmp );
idx += inc1;
}
return out;
}
// EXPORTS //
module.exports = linspace2d;
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