Press n or j to go to the next uncovered block, b, p or k for the previous block.
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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 gnone = require( '@stdlib/blas/ext/base/gnone' ).ndarray;
// MAIN //
/**
* Returns the index of the first row in an input matrix in which all elements are falsy.
*
* ## Notes
*
* - If the function is provided an empty matrix or if the function is unable to find a row in which all elements are falsy, 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 = [ 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, 1.0, 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, 1.0, 1.0, 1.0 ] ]
*
* var out = gindexOfFalsyRow( 4, 4, A, 4, 1, 0 );
* // returns 1
*
* @example
* var A = [ 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0 ]; // => [ [ 1.0, 1.0 ], [ 1.0, 1.0 ], [ 1.0, 1.0 ], [ 1.0, 1.0 ] ]
*
* var out = gindexOfFalsyRow( 4, 2, A, 2, 1, 0 );
* // returns -1
*
* @example
* var A = [ 1.0, 1.0, 0.0, 0.0, 0.0, 0.0, 1.0, 1.0 ]; // => [ [ 1.0, 1.0 ], [ 0.0, 0.0 ], [ 0.0, 0.0 ], [ 1.0, 1.0 ] ]
*
* var out = gindexOfFalsyRow( 4, 2, A, 2, 1, 0 );
* // returns 1
*/
function gindexOfFalsyRow( M, N, A, strideA1, strideA2, offsetA ) {
var ia;
var i;
// Check whether the matrix is an empty matrix...
if ( M <= 0 || N <= 0 ) {
return -1;
}
ia = offsetA;
for ( i = 0; i < M; i++ ) {
if ( gnone( N, A, strideA2, ia ) ) {
return i;
}
ia += strideA1;
}
return -1;
}
// EXPORTS //
module.exports = gindexOfFalsyRow;
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