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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 gfill = require( '@stdlib/blas/ext/base/gfill' ).ndarray;
var accessors = require( './accessors.js' );
// MAIN //
/**
* Fills the rows of a matrix from a vector of fill values.
*
* @param {integer} M - number of rows in `X`
* @param {integer} N - number of columns in `X`
* @param {Collection} alpha - vector of fill values
* @param {integer} strideAlpha - stride length of `alpha`
* @param {NonNegativeInteger} offsetAlpha - starting index for `alpha`
* @param {Collection} X - input matrix
* @param {integer} strideX1 - stride length for the first dimension of `X`
* @param {integer} strideX2 - stride length for the second dimension of `X`
* @param {NonNegativeInteger} offsetX - starting index for `X`
* @returns {Collection} input matrix
*
* @example
* var alpha = [ 10.0, 20.0 ];
* var X = [ 1.0, 2.0, 3.0, 4.0, 5.0, 6.0 ];
*
* gfillRows( 2, 3, alpha, 1, 0, X, 3, 1, 0 );
* // X => [ 10.0, 10.0, 10.0, 20.0, 20.0, 20.0 ]
*/
function gfillRows( M, N, alpha, strideAlpha, offsetAlpha, X, strideX1, strideX2, offsetX ) {
var ia;
var ix;
var oa;
var ox;
var i;
var j;
if ( M <= 0 || N <= 0 ) {
return X;
}
oa = arraylike2object( alpha );
ox = arraylike2object( X );
if ( oa.accessorProtocol || ox.accessorProtocol ) {
return accessors( M, N, oa, strideAlpha, offsetAlpha, ox, strideX1, strideX2, offsetX );
}
// Column-major
if ( strideX1 === 1 ) {
ia = offsetAlpha;
for ( j = 0; j < N; j++ ) {
ix = offsetX + (j * strideX2);
ia = offsetAlpha;
for ( i = 0; i < M; i++ ) {
X[ ix ] = alpha[ ia ];
ix += strideX1;
ia += strideAlpha;
}
}
return X;
}
// Row-major
ia = offsetAlpha;
for ( i = 0; i < M; i++ ) {
ix = offsetX + (i * strideX1);
gfill( N, alpha[ ia ], X, strideX2, ix);
ia += strideAlpha;
}
return X;
}
// EXPORTS //
module.exports = gfillRows;
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