y = zeros(size(x)); % 成绩等级 这行代码什么意思,需要我做出改动吗
时间: 2024-02-19 08:59:07 浏览: 19
这行代码的作用是创建一个与x相同大小的全0矩阵y,用于存储成绩等级的离散标签。根据问题描述,成绩等级有三类,L对应1,M对应2,H对应3,因此可以将y中对应的元素赋值为1、2、3。
如果你的数据中成绩等级的标签不是L、M、H,而是其他标签,那么需要修改这行代码,将标签转换为1、2、3等整数。比如,如果成绩等级的标签是A、B、C,可以将代码修改为:
```matlab
y(strcmp('A', txt(2:end, 2))) = 1;
y(strcmp('B', txt(2:end, 2))) = 2;
y(strcmp('C', txt(2:end, 2))) = 3;
```
这样可以将A、B、C三个标签分别转换为1、2、3这三个整数。
相关问题
注释每行代码 close all; warning off; % x=zeros(1000); y=zeros(1000); % flag=zeros(1000,1); % dist=zeros(1000,1000); % ch=zeros(1000,1); % ch1=zeros(32,1); % dist1=zeros(32,1); % match=zeros(1000,32); % neig=zeros(1000,1); % residual=zeros(1000); % energy=zeros(32,1); % join=zeros(32,32); % join1=zeros(32,1); distance=zeros(32,32); for i=1:1000 % x(i)=rand()*1000; y(i)=rand()*1000; residual(i)=2; end for i=1:1000 % plot(x(i),y(i),'o'); hold on; end for i=1:1000 % for j=1:1000 dist(i,j)=sqrt(power(((x(i)-x(j))),2)+power(((y(i)-y(j))),2)); end end for i=1:1000 %
Sure, here's the commented code:
```
% This line closes all open figures and turns off warnings
close all; warning off;
% These lines initialize variables with zeros
x = zeros(1000);
y = zeros(1000);
flag = zeros(1000,1);
dist = zeros(1000,1000);
ch = zeros(1000,1);
ch1 = zeros(32,1);
dist1 = zeros(32,1);
match = zeros(1000,32);
neig = zeros(1000,1);
residual = zeros(1000);
energy = zeros(32,1);
join = zeros(32,32);
join1 = zeros(32,1);
distance = zeros(32,32);
% This loop assigns random values between 0 and 1000 to each element of x and y, and sets residual to 2 for each element
for i = 1:1000
x(i) = rand()*1000;
y(i) = rand()*1000;
residual(i) = 2;
end
% This loop plots 1000 points on a 2D graph using the values of x and y
for i = 1:1000
plot(x(i),y(i),'o');
hold on;
end
% This loop calculates the distance between each pair of points using the Pythagorean theorem and stores the result in the dist array
for i = 1:1000
for j = 1:1000
dist(i,j) = sqrt(power(((x(i)-x(j))),2) + power(((y(i)-y(j))),2));
end
end
% This loop performs some operations on each element of the arrays
for i = 1:1000
% code for this loop is not provided
end
```
y=np.zeros(56)这段代码什么意思
这段代码使用了NumPy库中的函数`zeros()`,用于创建一个元素全为0的Numpy数组。具体而言,它创建了一个形状为(56,)的一维数组y,其中每个元素的值都是0。可以通过以下代码来验证:
```python
import numpy as np
y = np.zeros(56)
print(y) # 输出全为0的一维数组
print(y.shape) # 输出数组形状
```
输出结果为:
```
[0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0.
0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0.
0. 0. 0. 0. 0. 0. 0. 0.]
(56,)
```