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Undefined function 'plotconfusion' for input arguments of type 'categorical'. ? WHHAATT ????

Asked by Pierre Lonfat on 2 May 2018
Latest activity Answered by Steven Lord
on 3 May 2018
Dear all,
I have no idea why the function plotconfusion does not work when the function confusionmat works perfectly well. Of couse with both the exact same inputs.
confusion = confusionmat(prediction(,1), machine.table.grade(,1));
plotconfusion(prediction(,1), machine.table.grade(,1));
Thank you very much for you help.


Pierre - if you look at the documentation for plotconfusion, what does it tell you about the inputs? So in the command line do,
doc plotconfusion
Can all inputs be of type categorical? I know that the online documentation from plotfconfusion indicates that this is the case, but the online docs correspond to the latest version of MATLAB...which may not be the version that you have.
Thank you Geoff for your answer. I have Matlab R2017b on of the latest version I guess.
Secondly, I do not understand why a very similar function confusionmat works but not plotconfusion.
Should I download matlab again ?

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1 Answer

Answer by Steven Lord
on 3 May 2018

The online documentation is for the most recent release, which currently is release R2018a.
The ability to plot confusion labels for categorical labels using the plotconfusion function was introduced in release R2018a, according to the Release Notes.
I don't know exactly when the confusionmat function started supporting categorical arrays as inputs, but from reading the documentation it seems like that support started well before release R2017b.


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