jedishrfu said:What version of MATLAB do you have? According to MATLAB docs that operator was added in MATLAB 2012b:
http://www.mathworks.com/help/symbolic/mupad_ref/plot-inequality.html
anyway here's an alternative scheme:
http://stackoverflow.com/questions/11345838/how-to-plot-inequalities
ENDLESSYOU said:My version is R2012b, and I just copied the codes form the examples on the webpage. But it failed. It seems like the problem is about '::'.
jedishrfu said:The reference below said that it only works in a MUPAD notebook and to try this:
evalin(symengine, 'plot(plot::Inequality(x^2 + y^2 < 1,x = -1.5..1.5, y = -1.5..1.5))')
http://www.mathworks.com/matlabcentral/answers/14607
Doesn't work for me as I don't have these extensions and I am at MATLAB 2011b
"Unexpected operator for 'plotinequality'" is an error message that occurs when there is an error in the code of a program or script that involves plotting inequalities. Specifically, it means that the program has encountered an unexpected mathematical operator when trying to plot an inequality.
You are getting this error message because there is a mistake in the code for plotting inequalities. This could be due to a typo, missing or incorrect mathematical operators, or other syntax errors.
To fix this error, you will need to carefully review the code for plotting inequalities and check for any mistakes. This may involve double-checking the use of mathematical operators, making sure they are in the correct order, and ensuring that all necessary variables and functions are properly defined.
Yes, you can prevent this error by writing careful and accurate code for plotting inequalities. This may involve using proper syntax, checking for typos, and testing the code thoroughly before running it.
While this error may occur from time to time, it is not a particularly common error. It is more likely to occur if there are mistakes in the code or if the code is not written carefully.