jiangchengfeiyi-xiaochengxu/node_modules/mathjs/lib/cjs/function/matrix/row.js
2025-01-02 11:13:50 +08:00

65 lines
1.7 KiB
JavaScript

"use strict";
Object.defineProperty(exports, "__esModule", {
value: true
});
exports.createRow = void 0;
var _factory = require("../../utils/factory.js");
var _is = require("../../utils/is.js");
var _object = require("../../utils/object.js");
var _array = require("../../utils/array.js");
const name = 'row';
const dependencies = ['typed', 'Index', 'matrix', 'range'];
const createRow = exports.createRow = /* #__PURE__ */(0, _factory.factory)(name, dependencies, _ref => {
let {
typed,
Index,
matrix,
range
} = _ref;
/**
* Return a row from a Matrix.
*
* Syntax:
*
* math.row(value, index)
*
* Example:
*
* // get a row
* const d = [[1, 2], [3, 4]]
* math.row(d, 1) // returns [[3, 4]]
*
* See also:
*
* column
*
* @param {Array | Matrix } value An array or matrix
* @param {number} row The index of the row
* @return {Array | Matrix} The retrieved row
*/
return typed(name, {
'Matrix, number': _row,
'Array, number': function (value, row) {
return _row(matrix((0, _object.clone)(value)), row).valueOf();
}
});
/**
* Retrieve a row of a matrix
* @param {Matrix } value A matrix
* @param {number} row The index of the row
* @return {Matrix} The retrieved row
*/
function _row(value, row) {
// check dimensions
if (value.size().length !== 2) {
throw new Error('Only two dimensional matrix is supported');
}
(0, _array.validateIndex)(row, value.size()[0]);
const columnRange = range(0, value.size()[1]);
const index = new Index(row, columnRange);
const result = value.subset(index);
return (0, _is.isMatrix)(result) ? result : matrix([[result]]);
}
});