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How plot a matrix for Naive Bayes classifier?

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Bajdar Nour
Bajdar Nour on 20 Sep 2018
Commented: Bajdar Nour on 22 Sep 2018
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?


Bajdar Nour
Bajdar Nour on 21 Sep 2018
Dear @Brendan, but when I use heatmap it gives this
Cannot find an exact (case-sensitive) match for 'heatmap'
The closest match is: HeatMap in C:\Program Files\MATLAB\MATLAB Production Server\R2015a\toolbox\bioinfo\microarray\@HeatMap\HeatMap.m

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Accepted Answer

Brendan Hamm
Brendan Hamm on 21 Sep 2018
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);
% 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:
% Add a colorbar
This is basically what heatmap does by default, so upgrading makes things quite a bit easier.

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