@rayyamhk/matrix/lib/core/utils/generate.js

A professional, comprehensive and high-performance library for you to manipulate matrices.

"use strict";

var empty = require('../../util/empty');
/**
 * This callback generates each entry of a Matrix
 * @callback generateCallback
 * @param {number} i - The i-th row of Matrix 
 * @param {number} j - The j-th column of Matrix 
 * @returns {number} Entry of Matrix
 */

/**
 * Generates a Matrix which entries are the returned value of callback function.
 * @memberof Matrix
 * @static
 * @param {number} row - Number of rows of Matrix
 * @param {number} col - Number of columns of Matrix
 * @param {generateCallback} cb - Callback function which takes row and column as arguments
 * and generates the corresponding entry
 * @returns {Matrix} - Generated Matrix
 */


function generate(row, col, cb) {
  var matrix = empty(row, col);

  if (row === 0 || col === 0) {
    return new this([]);
  }

  for (var i = 0; i < row; i++) {
    for (var j = 0; j < col; j++) {
      matrix[i][j] = cb(i, j);
    }
  }

  return new this(matrix);
}

;
module.exports = generate;