package DecisionTree; import java.io.*; import java.util.*; public class ID3 { //节点类 public class DTNode { private String attribute; private HashMap<String, DTNode> children = new HashMap<String, DTNode>(); public String getAttribute() { retur
最近写了一段代码,一直弹出“??? Undefined function or variable 'x'.”这个错误.仔细检查了一下,发现是赋值的问题.比如下面两段代码 h=1 h=x h=1表示的是将1赋值给h 而h=x表示的是将x赋值给h 如果我之前没有对x赋值过,此时突然加了“h=x”这段代码,那么窗口就会弹出“ ??? Undefined function or variable 'x'.”这个错误提醒,意思是让我先对x进行赋值,才能够将x的值赋给h,如果我没有先对x赋值,“h=x”这个
function y=myfunction(a,b)其中a,b是输入函数的参数,y是函数返回的值.当需要返回多个值时,可以将y看作一个数组,或者直接将函数的开头写成如function [x,y]=myfunction(x,y)的形式.然后就是定义函数的内容,通俗的说就是怎样由输入参数a,b得到返回值y.比如最简单的y=a+b. 总结一下,将下面的代码function y=myfunction(a,b)y=a+b;保存为一个m文件myfunction.m,调用方式如下.num=myfunction
from http://pundit.pratt.duke.edu/wiki/MATLAB:Plotting The plot Function The plot function is used to plot sets of data on a 2-D grid. What follows comes from MATLAB's help function in MATLAB R2009a[1] (some paragraphs have been snipped out). The lin
I am writing a python script from which I hope to call the Matlab anovan function. I have attempted a basic test of this feature on file test.txt. This file is imported as array data. In matlab, the anovan function would be called as follows: anovan(