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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.
*/
/* eslint-disable max-len, max-params */
'use strict';
// MODULES //
var consensusOrder = require( '@stdlib/ndarray/base/consensus-order' );
var gcopy = require( '@stdlib/blas/base/gcopy' ).ndarray;
// FUNCTIONS //
/**
* Tests whether a character matches a known transpose operation.
*
* @private
* @param {string} str - input value
* @returns {boolean} boolean indicating whether the input value is a recognized transpose operation
*
* @example
* var bool = isTransposed( 'transpose' );
* // returns true
*
* @example
* var bool = isTransposed( 'no-transpose' );
* // returns false
*/
function isTransposed( str ) {
return ( str !== 'no-transpose' );
}
// MAIN //
/**
* Takes rows from one of two input matrices depending on a condition.
*
* @private
* @param {(integer|string)} transA - specifies whether `A` should be transposed or not transposed
* @param {(integer|string)} transB - specifies whether `B` should be transposed or not transposed
* @param {NonNegativeInteger} M - number of indexed elements in `condition` and number of rows in `op(A)`, `op(B)`, and `out`
* @param {NonNegativeInteger} N - number of columns in `op(A)`, `op(B)` and `out`
* @param {Object} condition - condition array object
* @param {Collection} condition.data - condition array data
* @param {Array<Function>} condition.accessors - array element accessors
* @param {integer} strideC - stride length for `condition`
* @param {NonNegativeInteger} offsetC - starting index for `condition`
* @param {Object} A - first input matrix object
* @param {Collection} A.data - first input matrix data
* @param {Array<Function>} A.accessors - array element accessors
* @param {integer} strideA1 - stride length for the first dimension of `A`
* @param {integer} strideA2 - stride length for the second dimension of `A`
* @param {NonNegativeInteger} offsetA - starting index for `A`
* @param {Object} B - second input matrix object
* @param {Collection} B.data - second input matrix data
* @param {Array<Function>} B.accessors - array element accessors
* @param {integer} strideB1 - stride length for the first dimension of `B`
* @param {integer} strideB2 - stride length for the second dimension of `B`
* @param {NonNegativeInteger} offsetB - starting index for `B`
* @param {Object} out - output matrix object
* @param {Collection} out.data - output matrix data
* @param {Array<Function>} out.accessors - array element accessors
* @param {integer} strideO1 - stride length for the first dimension of `out`
* @param {integer} strideO2 - stride length for the second dimension of `out`
* @param {NonNegativeInteger} offsetO - starting index for `out`
* @returns {Object} output matrix object
*
* @example
* var toAccessorArray = require( '@stdlib/array/base/to-accessor-array' );
* var arraylike2object = require( '@stdlib/array/base/arraylike2object' );
*
* var A = [ 1.0, 2.0, 3.0, 4.0, 5.0, 6.0 ];
* var B = [ 7.0, 8.0, 9.0, 10.0, 11.0, 12.0 ];
* var condition = [ 1, 0 ];
* var out = [ 0.0, 0.0, 0.0, 0.0, 0.0, 0.0 ];
*
* accessors( 'no-transpose', 'no-transpose', 2, 3, arraylike2object( toAccessorArray( condition ) ), 1, 0, arraylike2object( toAccessorArray( A ) ), 3, 1, 0, arraylike2object( toAccessorArray( B ) ), 3, 1, 0, arraylike2object( toAccessorArray( out ) ), 3, 1, 0 );
* // out => [ 1.0, 2.0, 3.0, 10.0, 11.0, 12.0 ]
*/
function accessors( transA, transB, M, N, condition, strideC, offsetC, A, strideA1, strideA2, offsetA, B, strideB1, strideB2, offsetB, out, strideO1, strideO2, offsetO ) {
var rowOffsetOut;
var colOffsetOut;
var rowOffsetA;
var rowOffsetB;
var colOffsetA;
var colOffsetB;
var order;
var cbuf;
var abuf;
var bbuf;
var obuf;
var cget;
var aget;
var bget;
var oset;
var sa1;
var sa2;
var sb1;
var sb2;
var ic;
var ia;
var ib;
var io;
var i;
var j;
// Cache references to array data...
cbuf = condition.data;
abuf = A.data;
bbuf = B.data;
obuf = out.data;
// Cache references to element accessors...
cget = condition.accessors[ 0 ];
aget = A.accessors[ 0 ];
bget = B.accessors[ 0 ];
oset = out.accessors[ 1 ];
sa1 = strideA1;
sa2 = strideA2;
if ( isTransposed( transA ) ) {
sa1 = strideA2;
sa2 = strideA1;
}
sb1 = strideB1;
sb2 = strideB2;
if ( isTransposed( transB ) ) {
sb1 = strideB2;
sb2 = strideB1;
}
// Determine consensus order:
order = consensusOrder([
[ sa1, sa2 ],
[ sb1, sb2 ],
[ strideO1, strideO2 ]
]);
if ( order === 'row-major' ) {
for ( i = 0; i < M; i++ ) {
ic = offsetC + ( i * strideC );
rowOffsetA = offsetA + ( i * sa1 );
rowOffsetB = offsetB + ( i * sb1 );
rowOffsetOut = offsetO + ( i * strideO1 );
if ( cget( cbuf, ic ) ) {
gcopy( N, abuf, sa2, rowOffsetA, obuf, strideO2, rowOffsetOut );
} else {
gcopy( N, bbuf, sb2, rowOffsetB, obuf, strideO2, rowOffsetOut );
}
}
} else {
for ( j = 0; j < N; j++ ) {
colOffsetA = offsetA + ( j * sa2 );
colOffsetB = offsetB + ( j * sb2 );
colOffsetOut = offsetO + ( j * strideO2 );
for ( i = 0; i < M; i++ ) {
ic = offsetC + ( i * strideC );
ia = colOffsetA + ( i * sa1 );
ib = colOffsetB + ( i * sb1 );
io = colOffsetOut + ( i * strideO1 );
if ( cget( cbuf, ic ) ) {
oset( obuf, io, aget( abuf, ia ) );
} else {
oset( obuf, io, bget( bbuf, ib ) );
}
}
}
}
return out;
}
// EXPORTS //
module.exports = accessors;
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