How can I plot 18 lines in different colors on a single plot?

46 vues (au cours des 30 derniers jours)
ANDREA le 10 Jan 2023
Modifié(e) : DGM le 10 Jan 2023
Hi everyone!
I have to plot 18 different functions of time, all in one single figure. How can i assign 18 different colors? (i work with matlab 2014)
Thanks.
0 commentairesAfficher -2 commentaires plus anciensMasquer -2 commentaires plus anciens

Connectez-vous pour commenter.

Réponse acceptée

DGM le 10 Jan 2023
Modifié(e) : DGM le 10 Jan 2023
In versions prior to R2019b, you can always set the axes property without the colororder() function.
% some fake data
x = linspace(0,1,100);
y = bsxfun(@plus,rand(18,100),(1:18).'); % i'm assuming we're in an older version
% set the axes colororder
CT = jet(18); % not that this is a good choice
set(gca,'colororder',CT);
% plot things
hold on
plot(x,y)
Of course, like @Bjorn Gustavsson says, unless you do something beyond this (e.g. using a carefully crafted map or using other line properties), putting 18 curves in the same plot can be a readability problem, especially if they overlap or the results need to be printed. For example:
clf
% exact same colors, but data series don't have sequential offsets
x = linspace(0,1,100);
os = (1:18).';
y = bsxfun(@plus,rand(18,100),os(randperm(18)));
% set the axes colororder
CT = jet(18); % not that this is a good choice
set(gca,'colororder',CT);
hold on
hp = plot(x,y);
% which curve is data 4?
legend(hp,'location','eastoutside')
0 commentairesAfficher -2 commentaires plus anciensMasquer -2 commentaires plus anciens

Connectez-vous pour commenter.

Plus de réponses (2)

Bjorn Gustavsson le 10 Jan 2023
For that type of tasks I have had good use of the cmlines-function in the colormap-and-colorbar-utilities toolbox on the file exchange. With that it is as simple as:
ph = plot(randn(18,18));
colormap(turbo)
cmlines(ph(1:12))
colormap(copper)
cmlines(ph(13:18))
(unasked for advice: sometimes my plots become more legible if I also use linewith and linestyle to differentiate between lines)
HTH
0 commentairesAfficher -2 commentaires plus anciensMasquer -2 commentaires plus anciens

Connectez-vous pour commenter.

the cyclist le 10 Jan 2023
Modifié(e) : the cyclist le 10 Jan 2023
If your version of MATLAB is 2019b or later, I suggest the colororder function. (I see that you mention an older version, so this may be more for other folks who come across this question.)
And for that many colors, I would recommend using a utility like this one for defining maximally distinguishable colors (and/or using different plotting symbols and line styles.)
1 commentaireAfficher -1 commentaires plus anciensMasquer -1 commentaires plus anciens
Bjorn Gustavsson le 10 Jan 2023
Hopefully there are some more "natural" ordering and/or grouping of the function to plot, and then it might be way better to one distinct colormap per group of curves to guide the viewer.

Connectez-vous pour commenter.

Catégories

En savoir plus sur Annotations dans Help Center et File Exchange

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by