Hi Ercong,
I understand that you want to execute the script and plot it. However, MATLAB is throwing error if trying to run directly. To execute it replace the 3rd line as below:
>>figure('Units','normalized','NumberTitle','off','name','Robot','color','w','position',[.1 .1 .8 .8])
In the GUI you can press the 'Go' button to plot.
If this does not answer your question, then please provide more details about the issue.
