How plot a matrix for Naive Bayes classifier?
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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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Brendan Hamm
2018-9-21
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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