Press n or j to go to the next uncovered block, b, p or k for the previous block.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 | 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 33x 33x 33x 33x 33x 33x 33x 33x 13x 13x 33x 12x 12x 12x 33x 8x 8x 8x 8x 33x 4x 4x 16x 33x 2x 2x 2x 2x 2x | /**
* @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 isRowMajor = require( '@stdlib/ndarray/base/assert/is-row-major-string' );
var resolveLayout = require( '@stdlib/blas/base/layout-resolve-str' );
var max = require( '@stdlib/math/base/special/fast/max' );
var format = require( '@stdlib/string/format' );
var ndarray = require( './ndarray.js' );
// MAIN //
/**
* Returns the index of the first column 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 column in which all elements are falsy, the function returns `-1` (i.e., an invalid index).
*
* @param {(integer|string)} order - storage layout
* @param {PositiveInteger} M - number of rows in `A`
* @param {PositiveInteger} N - number of columns in `A`
* @param {Collection} A - input matrix
* @param {integer} LDA - stride length for the first dimension of `A` (a.k.a., leading dimension of the matrix `A`)
* @throws {TypeError} first argument must be a valid order
* @throws {RangeError} fifth argument must be a valid stride length
* @returns {integer} column index
*
* @example
* var A = [ 1.0, 0.0, 1.0, 1.0, 1.0, 0.0, 1.0, 1.0, 1.0, 0.0, 1.0, 1.0, 1.0, 0.0, 1.0, 1.0 ]; // => [ [ 1.0, 0.0, 1.0, 1.0 ], [ 1.0, 0.0, 1.0, 1.0 ], [ 1.0, 0.0, 1.0, 1.0 ], [ 1.0, 0.0, 1.0, 1.0 ] ]
*
* var out = gindexOfFalsyColumn( 'row-major', 4, 4, A, 4 );
* // 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 = gindexOfFalsyColumn( 'row-major', 2, 4, A, 4 );
* // returns -1
*
* @example
* var A = [ 1.0, 0.0, 1.0, 1.0, 1.0, 0.0, 1.0, 1.0 ]; // => [ [ 1.0, 0.0, 1.0, 1.0 ], [ 1.0, 0.0, 1.0, 1.0 ] ]
*
* var out = gindexOfFalsyColumn( 'row-major', 2, 4, A, 4 );
* // returns 1
*/
function gindexOfFalsyColumn( order, M, N, A, LDA ) {
var sa1;
var sa2;
var s;
var l;
l = resolveLayout( order );
if ( l === null ) {
throw new TypeError( format( 'invalid argument. First argument must be a valid order. Value: `%s`.', order ) );
}
if ( isRowMajor( l ) ) {
s = N;
sa1 = LDA;
sa2 = 1;
} else { // order === 'column-major'
s = M;
sa1 = 1;
sa2 = LDA;
}
if ( LDA < max( 1, s ) ) {
throw new RangeError( format( 'invalid argument. Fifth argument must be greater than or equal to max(1,%d). Value: `%d`.', s, LDA ) );
}
return ndarray( M, N, A, sa1, sa2, 0 );
}
// EXPORTS //
module.exports = gindexOfFalsyColumn;
|