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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 gindexOfTruthyRow = require( '@stdlib/blas/ext/base/gindex-of-truthy-row' ).ndarray;
// MAIN //
/**
* Returns the index of the last row in an input matrix which contains at least one truthy element.
*
* ## Notes
*
* - If the function is provided an empty matrix or if the function is unable to find a row with at least one truthy element, the function returns `-1` (i.e., an invalid index).
*
* @param {PositiveInteger} M - number of rows in `A`
* @param {PositiveInteger} N - number of columns in `A`
* @param {Collection} A - input matrix
* @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`
* @returns {integer} row index
*
* @example
* var A = [ 0.0, 0.0, 0.0, 0.0, 1.0, 0.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 0.0, 0.0, 0.0, 0.0 ]; // => [ [ 0.0, 0.0, 0.0, 0.0 ], [ 1.0, 0.0, 1.0, 1.0 ], [ 1.0, 1.0, 1.0, 1.0 ], [ 0.0, 0.0, 0.0, 0.0 ] ]
*
* var out = glastIndexOfTruthyRow( 4, 4, A, 4, 1, 0 );
* // returns 2
*
* @example
* var A = [ 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0 ]; // => [ [ 0.0, 0.0 ], [ 0.0, 0.0 ], [ 0.0, 0.0 ], [ 0.0, 0.0 ] ]
*
* var out = glastIndexOfTruthyRow( 4, 2, A, 2, 1, 0 );
* // returns -1
*
* @example
* var A = [ 0.0, 0.0, 0.0, 1.0, 1.0, 1.0, 0.0, 0.0 ]; // => [ [ 0.0, 0.0 ], [ 0.0, 1.0 ], [ 1.0, 1.0 ], [ 0.0, 0.0 ] ]
*
* var out = glastIndexOfTruthyRow( 4, 2, A, 2, 1, 0 );
* // returns 2
*/
function glastIndexOfTruthyRow( M, N, A, strideA1, strideA2, offsetA ) {
var idx;
// Check whether the matrix is an empty matrix...
if ( M <= 0 || N <= 0 ) {
return -1;
}
// Reverse the row iteration order by flipping the stride for the first dimension and adjusting the offset:
offsetA += ( M-1 ) * strideA1;
strideA1 *= -1;
// Find the index of the first row containing at least one truthy element in the row-reversed "view":
idx = gindexOfTruthyRow( M, N, A, strideA1, strideA2, offsetA );
if ( idx < 0 ) {
return idx;
}
// Convert the index from the row-reversed "view" to an index in the original "view":
return M - 1 - idx;
}
// EXPORTS //
module.exports = glastIndexOfTruthyRow;
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