How plot a matrix for Naive Bayes classifier?

Bajdar Nour - 2022-04-14T11:30:09+00:00

Question: How plot a matrix for Naive Bayes classifier?

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 answered . 2025-11-20

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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