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 96 97 98 99 100 101 | 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 30x 30x 30x 30x 30x 30x 30x 30x 30x 30x 30x 30x 30x 30x 30x 30x 30x 30x 30x 30x 30x 30x 90x 90x 90x 30x 30x 30x 60x 60x 30x 30x 30x 60x 60x 60x 90x 90x 90x 60x 60x 30x 30x 3x 3x 3x 3x 3x | /**
* @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.
*/
/* eslint-disable max-params */
'use strict';
// MAIN //
/**
* Generates a Leslie matrix using accessor arrays.
*
* @private
* @param {NonNegativeInteger} N - number of fecundity coefficients
* @param {Object} f - fecundity coefficients array object
* @param {integer} strideF - stride length for `f`
* @param {NonNegativeInteger} offsetF - starting index for `f`
* @param {Object} s - survival coefficients array object
* @param {integer} strideS - stride length for `s`
* @param {NonNegativeInteger} offsetS - starting index for `s`
* @param {Object} out - output array object
* @param {integer} strideOut1 - stride length for the first dimension of `out`
* @param {integer} strideOut2 - stride length for the second dimension of `out`
* @param {NonNegativeInteger} offsetOut - starting index for `out`
* @returns {Object} output array object
*
* @example
* var toAccessorArray = require( '@stdlib/array/base/to-accessor-array' );
* var arraylike2object = require( '@stdlib/array/base/arraylike2object' );
*
* var f = [ 1.0, 2.0, 3.0 ];
* var s = [ 0.4, 0.5 ];
* var out = [ 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0 ];
*
* gleslie( 3, arraylike2object( toAccessorArray( f ) ), 1, 0, arraylike2object( toAccessorArray( s ) ), 1, 0, arraylike2object( toAccessorArray( out ) ), 3, 1, 0 );
* // out => [ 1.0, 2.0, 3.0, 0.4, 0.0, 0.0, 0.0, 0.5, 0.0 ]
*/
function gleslie( N, f, strideF, offsetF, s, strideS, offsetS, out, strideOut1, strideOut2, offsetOut ) { // eslint-disable-line max-len
var fbuf;
var sbuf;
var obuf;
var getF;
var getS;
var oset;
var io;
var ij;
var i;
var j;
fbuf = f.data;
sbuf = s.data;
obuf = out.data;
getF = f.accessors[ 0 ];
getS = s.accessors[ 0 ];
oset = out.accessors[ 1 ];
// Set the first row to the fecundity coefficients:
ij = offsetOut;
for ( j = 0; j < N; j++ ) {
oset( obuf, ij, getF( fbuf, offsetF + ( j * strideF ) ) );
ij += strideOut2;
}
// Set the sub-diagonal to the survival coefficients and fill remaining elements with zeros:
io = offsetOut + strideOut1;
for ( i = 1; i < N; i++ ) {
ij = io;
for ( j = 0; j < i - 1; j++ ) {
oset( obuf, ij, 0.0 );
ij += strideOut2;
}
oset( obuf, ij, getS( sbuf, offsetS + ( ( i - 1 ) * strideS ) ) );
ij += strideOut2;
for ( j = i; j < N; j++ ) {
oset( obuf, ij, 0.0 );
ij += strideOut2;
}
io += strideOut1;
}
return out;
}
// EXPORTS //
module.exports = gleslie;
|