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| 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 | 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 30x 30x 30x 30x 30x 30x 30x 30x 11x 11x 11x 11x 11x 30x 6x 6x 6x 6x 6x 19x 13x 13x 30x 4x 4x 30x 4x 4x 9x 30x 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 max = require( '@stdlib/math/base/special/fast/max' );
var format = require( '@stdlib/string/format' );
var ndarray = require( './ndarray.js' );
// MAIN //
/**
* Computes a summed-area table for a matrix.
*
* @param {string} order - memory layout order ('row-major' or 'column-major')
* @param {PositiveInteger} M - number of rows in `A`
* @param {PositiveInteger} N - number of columns in `A`
* @param {NumericArray} A - input matrix
* @param {integer} LDA - stride length between successive contiguous vectors of `A` (leading dimension of `A`)
* @param {NumericArray} out - output matrix
* @param {integer} LDO - stride length between successive contiguous vectors of `out` (leading dimension of `out`)
* @throws {TypeError} first argument must be a valid order
* @throws {RangeError} fifth argument must be greater than or equal to max(1,N)
* @throws {RangeError} seventh argument must be greater than or equal to max(1,N)
* @returns {NumericArray} output matrix
*
* @example
* var A = [ 1, 2, 3, 4 ];
* var out = [ 0, 0, 0, 0 ];
*
* gsummedAreaTable( 'row-major', 2, 2, A, 2, out, 2 );
* // out => [ 1, 3, 4, 10 ]
*/
function gsummedAreaTable( order, M, N, A, LDA, out, LDO ) {
var strideOut1;
var strideOut2;
var strideA1;
var strideA2;
var s;
if ( order === 'row-major' ) {
s = N;
strideA1 = LDA;
strideA2 = 1;
strideOut1 = LDO;
strideOut2 = 1;
} else if ( order === 'column-major' ) {
s = M;
strideA1 = 1;
strideA2 = LDA;
strideOut1 = 1;
strideOut2 = LDO;
} else {
throw new TypeError( format( 'invalid argument. First argument must be a valid order. Value: `%s`.', order ) );
}
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 ) );
}
if ( LDO < max( 1, s ) ) {
throw new RangeError( format( 'invalid argument. Seventh argument must be greater than or equal to max(1,%d). Value: `%d`.', s, LDO ) );
}
return ndarray( M, N, A, strideA1, strideA2, 0, out, strideOut1, strideOut2, 0 ); // eslint-disable-line max-len
}
// EXPORTS //
module.exports = gsummedAreaTable;
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