Confusion Metrics Plottings Causing An Error

Hi all,

I am uncertain of the way forward and require some direction to move onward with my metrics plans!

Challenge:

I am trying to plot the score and labels of the confusion metrics but unsure of the right procedures and values to use. I have been reading the documents and still i need a push to understanding what are the values that is required. I am confused please assist?

I have a data set which is splitted into MyTrain and MyTest

I tried the following but Matlab is constantly arguing and I am sure that I am the cause;

[PredlabelIdx, predscore] = predict(categoryClassifier,MyTest);
predlabs = categoryClassifier.Labels(labelIdx')
ConfusionM_Chart = confusionchart(PredlabelIdx,predscore)