I can not use the command‘plot’，what should I do？

error information:

错误使用 plot

查找类 matlab.graphics.chart.primitive.Line 时出错。

But I cannot find the'primitive' floder. What should I do if I want to use ‘plot’ normally？

ps：The executed program is as follows, which is a simple piece of code.

x = linspace(0,2*pi);

y1 = sin(x);

y2 = cos(x);

plot(x,y1,x,y2)

title('y1=sin(x), y2=cos(x)')

xlabel('X(m)')

ylabel('Y(m)')

Answer 1

[nick]

Hi 鑫 ,

The error 'Error looking up class matlab.graphics.chart.primitive.Line' suggests that MATLAB is unable to locate the class definition of the 'Line' object, which is a fundamental part of MATLAB's plotting system.

This could be due to various reasons such as a corrupted MATLAB installation, issues with the MATLAB path, or problems with Java on your system.

You can try the below-mentioned steps to resolve this issue:

• It's possible that the MATLAB path has been altered, excluding important directories. You can reset the path to its default settings with the following commands:

restoredefaultpath;
rehash toolboxcache;
matlab.graphics.chart.primitive.Line;

• Sometimes, issues with MATLAB's Java-based components can be resolved by clearing the Java cache. Use the following command:

clear java;

• Try reinstalling the MATLAB as there might be a deeper issue with the MATLAB installation.

[鑫]

Thanks！