The discussion centers on the error "Unexpected MATLAB operator" encountered when attempting to plot inequalities using the command plot(plot::Inequality(x^2 + y^2 < 1,x = -1.5..1.5, y = -1.5..1.5)) in MATLAB. This operator was introduced in MATLAB version R2012b, which means users with earlier versions, such as R2011b, will face compatibility issues. A workaround involves using a MuPAD notebook with the command evalin(symengine, 'plot(plot::Inequality(x^2 + y^2 < 1,x = -1.5..1.5, y = -1.5..1.5))'). Users are advised to upgrade to at least R2012b or utilize MuPAD for successful execution.
evalin function in MATLAB for executing commands in the symbolic engineMATLAB users, especially those working with symbolic computations, educators teaching mathematical concepts, and developers needing to visualize inequalities in their projects.
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