ysjj-system/node_modules/mathjs/lib/esm/function/matrix/matrixFromFunction.js

import { factory } from '../../utils/factory.js';
var name = 'matrixFromFunction';
var dependencies = ['typed', 'matrix', 'isZero'];
export var createMatrixFromFunction = /* #__PURE__ */factory(name, dependencies, _ref => {
  var {
    typed,
    matrix,
    isZero
  } = _ref;
  /**
   * Create a matrix by evaluating a generating function at each index.
   * The simplest overload returns a multi-dimensional array as long as `size` is an array.
   * Passing `size` as a Matrix or specifying a `format` will result in returning a Matrix.
   *
   * Syntax:
   *
   *    math.matrixFromFunction(size, fn)
   *    math.matrixFromFunction(size, fn, format)
   *    math.matrixFromFunction(size, fn, format, datatype)
   *    math.matrixFromFunction(size, format, fn)
   *    math.matrixFromFunction(size, format, datatype, fn)
   *
   * Examples:
   *
   *    math.matrixFromFunction([3,3], i => i[0] - i[1]) // an antisymmetric matrix
   *    math.matrixFromFunction([100, 100], 'sparse', i => i[0] - i[1] === 1 ? 4 : 0) // a sparse subdiagonal matrix
   *    math.matrixFromFunction([5], i => math.random()) // a random vector
   *
   * See also:
   *
   *    matrix, zeros
   *
   * @param {Array | Matrix} size   The size of the matrix to be created
   * @param {function} fn           Callback function invoked for every entry in the matrix
   * @param {string} [format]       The Matrix storage format, either `'dense'` or `'sparse'`
   * @param {string} [datatype]     Type of the values
   * @return {Array | Matrix} Returns the created matrix
   */
  return typed(name, {
    'Array | Matrix, function, string, string': function ArrayMatrixFunctionStringString(size, fn, format, datatype) {
      return _create(size, fn, format, datatype);
    },
    'Array | Matrix, function, string': function ArrayMatrixFunctionString(size, fn, format) {
      return _create(size, fn, format);
    },
    'Matrix, function': function MatrixFunction(size, fn) {
      return _create(size, fn, 'dense');
    },
    'Array, function': function ArrayFunction(size, fn) {
      return _create(size, fn, 'dense').toArray();
    },
    'Array | Matrix, string, function': function ArrayMatrixStringFunction(size, format, fn) {
      return _create(size, fn, format);
    },
    'Array | Matrix, string, string, function': function ArrayMatrixStringStringFunction(size, format, datatype, fn) {
      return _create(size, fn, format, datatype);
    }
  });
  function _create(size, fn, format, datatype) {
    var m;
    if (datatype !== undefined) {
      m = matrix(format, datatype);
    } else {
      m = matrix(format);
    }
    m.resize(size);
    m.forEach(function (_, index) {
      var val = fn(index);
      if (isZero(val)) return;
      m.set(index, val);
    });
    return m;
  }
});