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* @license Apache-2.0
*
* Copyright (c) 2024 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.
*/
/* eslint-disable max-len */
'use strict';
// MODULES //
var isRowMajor = require( '@stdlib/ndarray/base/assert/is-row-major' );
// MAIN //
/**
* Converts a matrix from row-major layout to column-major layout or vice versa.
*
* @private
* @param {NonNegativeInteger} M - number of rows in matrix `A`
* @param {NonNegativeInteger} N - number of columns in matrix `A`
* @param {Float32Array} A - input matrix
* @param {integer} strideA1 - stride of the first dimension of `A`
* @param {integer} strideA2 - stride of the second dimension of `A`
* @param {NonNegativeInteger} offsetA - starting index for `A`
* @param {Float32Array} out - output matrix
* @param {integer} strideO1 - stride of the first dimension of `out`
* @param {integer} strideO2 - stride of the second dimension of `out`
* @param {NonNegativeInteger} offsetO - starting index for `out`
* @returns {Float32Array} `out`
*
* @example
* var Float32Array = require( '@stdlib/array/float32' );
*
* var A = new Float32Array( [ 1.0, 2.0, 3.0, 4.0, 5.0, 6.0 ] );
* var out = new Float32Array( 6 );
*
* out = sgetrans( 2, 3, A, 3, 1, 0, out, 2, 1, 0 );
* // returns <Float32Array>[ 1.0, 4.0, 2.0, 5.0, 3.0, 6.0 ]
*/
function sgetrans( M, N, A, strideA1, strideA2, offsetA, out, strideO1, strideO2, offsetO ) {
var isrm;
var da0;
var da1;
var do0;
var do1;
var ia;
var io;
var i0;
var i1;
var S0;
var S1;
// Note on variable naming convention: S#, da#, do#, i# where # corresponds to the loop number, with `0` being the innermost loop...
// Perform loop interchange based on the layout format of the output matrix...
isrm = isRowMajor( [ strideO1, strideO2 ] );
if ( isrm ) {
// For row-major matrices, the last dimensions have the fastest changing indices...
S0 = M;
S1 = N;
da0 = strideA1; // offset increment for innermost loop
da1 = strideA2 - ( S0*strideA1 ); // offset increment for outermost loop
do0 = strideO2;
do1 = strideO1 - ( S0*strideO2 );
} else {
// For column-major matrices, the first dimensions have the fastest changing indices...
S0 = N;
S1 = M;
da0 = strideA2; // offset increment for innermost loop
da1 = strideA1 - ( S0*strideA2 ); // offset increment for outermost loop
do0 = strideO1;
do1 = strideO2 - ( S0*strideO1 );
}
ia = offsetA;
io = offsetO;
for ( i1 = 0; i1 < S1; i1++ ) {
for ( i0 = 0; i0 < S0; i0++ ) {
out[ io ] = A[ ia ];
ia += da0;
io += do0;
}
ia += da1;
io += do1;
}
return out;
}
// EXPORTS //
module.exports = sgetrans;
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