MATLAB Answers

How to plot with diferents colors

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Gabriela Sousa
Gabriela Sousa on 29 May 2020
Answered: Image Analyst on 29 May 2020
Hello! I would like to differentiate types of filter and signals with and without noise, but I am not able to differentiate the noise part.
no_noise = plot(number_projections, SER_no_noise(:, :));
hold on;
with_noise = plot(number_projections, reshape(SER_with_noise(:, length(variance), :),...
[length(tests_to_run), length(number_projections)]));
h = [no_noise; with_noise];
legend(h, 'shep-logan NO NOISE','Cosine NO NOISE', 'ram-lak NO NOISE', 'Hann NO NOISE', 'Hamming NO NOISE',...
'shep-logan WITH NOISE','Cosine WITH NOISE', 'ram-lak WITH NOISE', 'Hann WITH NOISE', 'Hamming WITH NOISE')

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Answers (2)

Ameer Hamza
Ameer Hamza on 29 May 2020
Edited: Ameer Hamza on 29 May 2020
By default, the MATLAB axes only use seven colors to plot the lines. After that, the sequence is repeated if there are more then seven lines: https://www.mathworks.com/help/releases/R2020a/matlab/ref/matlab.graphics.axis.axes-properties.html#budumk7_sep_shared-ColorOrder. You can define your own colors to make them more distinguishable. For example
ax = axes()
ax.ColorOrder = rand(10,3); % define 10 rgb colors randomly. You can write your own matrix instead of using rand()
no_noise = plot(number_projections, SER_no_noise(:, :));
hold on;
with_noise = plot(number_projections, reshape(SER_with_noise(:, length(variance), :),...
[length(tests_to_run), length(number_projections)]));
h = [no_noise; with_noise];
legend(h, 'shep-logan NO NOISE','Cosine NO NOISE', 'ram-lak NO NOISE', 'Hann NO NOISE', 'Hamming NO NOISE',...
'shep-logan WITH NOISE','Cosine WITH NOISE', 'ram-lak WITH NOISE', 'Hann WITH NOISE', 'Hamming WITH NOISE')

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