Question
I want to illustrate the matrix as shown in the picture this is a part of the code fh = figure('Name', 'Confusion matrix', ... 'NumberTitle', 'off'); plotmat(cMat1, 'k', 'k', 15); title(['Classification rate: ' num2str(classificationrate) '% for Naive Bayes Classifier'], 'FontSize', 14); but it says Undefined function or variable 'plotmat'. does has any function instead plotmat?
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Expert Answer
John Michell
PhD Expert
Answered Nov 20, 2025
The heatmap function was introduced in 2017a. The imagesc function will work though. To display the numeric counts you will require a little more work with the text function requiring the location of the text and the x-y data points where the text should appear.
A = randi([0,20],5,5); imagesc(A); % Find the x, y locations for the text x = 1:size(A,2); y = 1:size(A,1); % Grid of X,Y locations: [X,Y] = meshgrid(x,y); % Convert numbers in matrix to cell array of chars c = cellfun(@num2str,num2cell(A),'UniformOutput',false); % Palce text labels at X,Y lcoations: text(X(:),Y(:),c(:),'HorizontalAlignment','center'); % Add a colorbar colorbar
This is basically what heatmap does by default, so upgrading makes things quite a bit easier.
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