Whhy it shows 'Undefined function or variable 'confMat'; Please check me code. I cant plot the confusion matrix

L = 3 ;
figure ('visible','on');
imagesc(confMat);colormap(flipud(gray)) ; caxis ([0,1])

textstr=num2str(confMat(:),'%0.2f');
textstr=strtrim(cellstr(textstr));

[x,y]=meshgrid(1:L);
hstrg=test(x(:),y(:) , textstr(:),
'HorizontalAlignment','center',
'FontSize',10,'FontName','Times New Roman');

midvalue=mean(get(gca,'Clim'));

textColors=repmat(confMat(:).midvalue,1,3);

set(gca,'XTick',1:L, 
'XTickLabel',
{'Unripe','Ripe','Fruit'};

Answer 1

[Walter Roberson]

... because you have not created any confMat ?

Perhaps you missed the assignment in https://www.mathworks.com/matlabcentral/answers/313397-how-to-plot-confusion-matrix-of-ecoc-classifier