How to create one plot with multiple lines in a for loop?

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AK 2021-5-27

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https://ww2.mathworks.cn/matlabcentral/answers/841425-how-to-create-one-plot-with-multiple-lines-in-a-for-loop

评论： Jan 2021-5-28

采纳的回答： Jan

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Hello,

I have been trying to create a plot, with an unknown number of lines. Each should be on the same graph, and a different colour. However, I am only getting one line on my graph.

This is my code currently:

y = cell(numFiles,1) ;
x = [30:10:100]
figure(); 
hold on
for k = 1:numFiles
    %Code that generates data
    y{k} = [h g f e d c b a ]
    plot(x,y{k}, 'Color', [rand,rand,rand])
end
 
title('SNR / Index')
hold off 

What am I doing wrong? Thank you!

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采纳的回答

Jan 2021-5-27

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/841425-how-to-create-one-plot-with-multiple-lines-in-a-for-loop#answer_710665

在 MATLAB Online 中打开

x = 30:10:100;

figure();

% axes('NextPlot', 'add'); % Same as: hold on

hold on

for k = 1:8

y{k} = rand(size(x));

plot(x, y{k}, 'Color', rand(1, 3))

end

You see, it works with hold('on') or with creating the axes explicitly also.

Are you sure, that this is your code and there is no cla anywhere?

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AK 2021-5-28

Thank you! This worked! I need to use the debugger more often.

Jan 2021-5-28

The debugger is the best friend of the programmer.

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