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how to assign colour to a double plot by clicking on graph in UIAxes appdesinger Matlab (R2020a)?

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taimour sadiq
taimour sadiq on 20 Oct 2020
Commented: taimour sadiq on 22 Oct 2020
hello, my objective is to assign different colour to a double plot of own choice. if i have three variable data...
a= [1 2 3]
b = [4 5 7]
c = [7 8 9]
plot (a.c)
% this will give us double plot... now one way to assign colour to plot is >>> plot(a,b,"color",'red') and plot(a,c,"color",'blue').
% second way is to throug "drop down" for example >>> SelectColour = app.dropdown.Value and then use plot(a,b,"colour",'SelectedColout')... with above two ways i succesfully assigned colour....
% third is to use default colour sequence... but i want user selected colour for every plot.
The above was just to show that i made effort but in first case we cannot change colour and in second case it changes colour for every graph. it should be coded such it saves colour assigned then assign next colour via dropdown
on "UIAxes" when i double click and assign any colour to first plot then any second colour to other plot.... Kindly Guide.


Adam Danz
Adam Danz on 20 Oct 2020
What release of Matlab are you using?
Do be clear, you want the user to be able to select a color for each line independently, is that correct?
Do you have a list of colors in mind?
Why doesn't your method #2 work? Could you share that part of the code? It will probably be easy to fix.
taimour sadiq
taimour sadiq on 21 Oct 2020
Thanks Adam for ur Reply... yes i want the user to be able to select a color for each line independently i m using R202a and colour could be any or lets say 'red' & Blue. Yes second choice is working but when i double plot it changes same. colour for both plots
i was using the code
function plotwidth(app)
a = 0:0.1:2*pi;
b = sin(a);
c = cos(a);
mycolour = app.SelectedColourDropDown.Value;
if app.LCheckBox.Value && ~app.SCheckBox.Value
app.M = plot(app.UIAxes,a,b,"Color",mycolour);
elseif app.SCheckBox.Value && ~app.LCheckBox.Value
app.M = plot(app.UIAxes,a,c,"Color",mycolour);
elseif app.LCheckBox.Value && app.SCheckBox.Value
app.N = plot(app.UIAxes,a,b,"Color",mycolour);
app.M = plot(app.UIAxes,a,c,"Color",mycolour);
app.M.Visible = 'off';

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Accepted Answer

Adam Danz
Adam Danz on 20 Oct 2020
Edited: Adam Danz on 20 Oct 2020
Line color can be changed when the figure is in Edit-plot mode by right-clicking on the line which shows the lines context menu and then by selecting Color (Matlab R2020B).
To turn on PlotEdit,
uif = uifigure();
uiax = uiaxes(uif);
plot(uiax, rand(5,3)); % add some lines
% Turn on plot-edit
% This can be placed in a callback function to toggle on/off
plotedit(uif,'on') % 'off' to turn off
now right-click on a line


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Adam Danz
Adam Danz on 21 Oct 2020
Your question states that you're plotting two lines but the example above only addresses 1 line.
All you need to do is change the color of the line - not re-plot it.
When you plot the two lines, store their handles in the app (instructions).
In your SelectedColourDropDown function, use those handles to change the colors of the lines. For example, if you named the line handles h1 and h2,
app.h1.Color = mycolour1;
app.h2.Color = mycolour2;
I forget if you can click on a line to make it active in app designer r2020a. If you can, then you can use,
set(gco, 'Color', mycolour)
otherrwise, you'll need to have some way to select which line the color applies to. You could have two color dropdown menus or you could have a 2nd menu that list Line1, Line2.
taimour sadiq
taimour sadiq on 21 Oct 2020
ok i will read this instruction and learn how to use handles... will update you tommorow because i m not well familiar with handles... Thanks
taimour sadiq
taimour sadiq on 22 Oct 2020
Hello Dear adam i finally use two dropdown to plot different colour but i will try again to do another way... Much Thanks for ur support. Best Regard
a= [1 2 3]
b = [4 5 7]
c = [7 8 9]
Colour1 = app.dropdown1.Value;
Colour2 = app.dropdown2.Value;

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