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* @license Apache-2.0
*
* Copyright (c) 2023 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 resolveGetter = require( '@stdlib/array/base/resolve-getter' );
// MAIN //
/**
* Converts a strided array to a three-dimensional nested array.
*
* ## Notes
*
* - The function assumes that the input array is compatible with the specified array shape, dimension strides, and index offset.
*
* @param {Collection} x - input array
* @param {NonNegativeIntegerArray} shape - array shape
* @param {IntegerArray} strides - dimension strides
* @param {NonNegativeInteger} offset - index of the first indexed value in the input array
* @returns {Array<Array<Array>>} three-dimensional nested array
*
* @example
* var x = [ 1, 2, 3, 4, 5, 6 ];
*
* var arr = strided2array3d( x, [ 1, 3, 2 ], [ 6, 2, 1 ], 0 );
* // returns [ [ [ 1, 2 ], [ 3, 4 ], [ 5, 6 ] ] ]
*
* @example
* var x = [ 1, 2, 3, 4, 5, 6 ];
*
* var arr = strided2array3d( x, [ 1, 3, 2 ], [ 1, 1, 3 ], 0 );
* // returns [ [ [ 1, 4 ], [ 2, 5 ], [ 3, 6 ] ] ]
*/
function strided2array3d( x, shape, strides, offset ) {
var get;
var out;
var dx0;
var dx1;
var dx2;
var ix1;
var ix0;
var S0;
var S1;
var S2;
var i0;
var i1;
var i2;
var t2;
var t1;
get = resolveGetter( x );
S2 = shape[ 0 ];
S1 = shape[ 1 ];
S0 = shape[ 2 ];
dx2 = strides[ 0 ];
dx1 = strides[ 1 ];
dx0 = strides[ 2 ];
out = [];
for ( i2 = 0; i2 < S2; i2++ ) {
t2 = [];
ix1 = offset + ( dx2*i2 );
for ( i1 = 0; i1 < S1; i1++ ) {
t1 = [];
ix0 = ix1 + ( dx1*i1 );
for ( i0 = 0; i0 < S0; i0++ ) {
t1.push( get( x, ix0 ) );
ix0 += dx0;
}
t2.push( t1 );
}
out.push( t2 );
}
return out;
}
// EXPORTS //
module.exports = strided2array3d;
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