Legend in for loop

Question

Mahesh 2015-10-23

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/250659-legend-in-for-loop

评论： Mahesh 2015-10-23

Dear all, I would like to insert legend inside the for loop plot. In this plot same class repeated many times. I want to display one categorry at a time.

for i = 1:udClass
    Legend{i} = ['Class' int2str(i)];
end
for i = 1:N
    idClass = classVec(i);
    plot(X(:,i), 'color', colors(idClass,:))
    x = floor(ndata/2);
    y = 1- (i-1)/N;
    text(x, y, int2str(i), 'color', colors(idClass,:), 'VerticalAlignment', 'top',...
    'HorizontalAlignment','center','FontSize',8)
end
legend(Legend, 'Location', 'Southeast');
With this code I got like shown

in which I got color repeated for different classes but I want each class with assigned colors. Could you please help me in this regard. Thanks

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Answer 1

Kelly Kearney 2015-10-23

0
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/250659-legend-in-for-loop#answer_197130

在 MATLAB Online 中打开

Save the handles of your plotted lines, then pass the specific handles of lines with a unique class to the legend command:

for i = 1:udClass
    Legend{i} = ['Class' int2str(i)];
end
h = gobjects(N,1); % h = zeros(N,1) if R2014a or earlier
for i = 1:N
    idClass = classVec(i);
    h(i) = plot(X(:,i), 'color', colors(idClass,:))
    x = floor(ndata/2);
    y = 1- (i-1)/N;
    text(x, y, int2str(i), 'color', colors(idClass,:), 'VerticalAlignment', 'top',...
    'HorizontalAlignment','center','FontSize',8)
end
[~,idx] = unique(classVec);
legend(h(idx), Legend, 'Location', 'Southeast');