MATLAB: Using RGB colour code while looping plots

colourplot

Hi,
while plotting different arrays in a loop I assigned them different colours. But as the contrast between the different colours is not very good, I´d like to have the colours in RGB code instead of the predefined 'r', 'k', …
j = 1;
k = 1;
str = {'A1', 'A2', 'A3', 'A4'};
col = {'r', 'k', 'g', 'b'};
for i = 1:20:80
    plot(M_3(i:19+i), col{k}, 'LineWidth',1); 
    str = [str ("Graph " + str(j))]; 
    hold on
    j = j+1; 
    k = k+1; 
end
I thought of something like col = {4 31 74, 5 41 98}; but an error pops up.
Can you help me using another way to define different colours?

Best Answer

Use one of the builtin colormaps or create your own nx3 RGB Color matrix where all values are between 0 and 1. 
col = parula(4); 
for i = 1:4
    % . . . skipping stuff
    plot(x,y,'Color', col(i,:))
end
Check out a list of color maps here
https://www.mathworks.com/help/matlab/ref/colormap.html#buc3wsn-1-map
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