# How do I change the marker size for a plot?

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john birt le 30 Avr 2011
Commenté : Evan le 18 Jan 2023
Im trying to set the marker size on a plot but having no luck, heres my code
this works fine
plot(
x , x^2,'-k*',...
x , x^3,'-ko',...
x , x^4,'-k' )
but when i try and set marker size it does not
plot(
x , x^2,'-k*',...
x , x^3,'-ko','MarkerSize',12,...
x , x^4,'-k' )
what do I need to do?
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Evan le 18 Jan 2023

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### Réponse acceptée

Oleg Komarov le 30 Avr 2011
Modifié(e) : MathWorks Support Team le 8 Nov 2018
You can change the marker size for a line plot by setting the “MarkerSize” property, either as a name-value pair or by accessing the “Line” object.
Name-value pair:
If you set this property as a name-value pair with the “plot” function, you must set it after all the x,y pairs. Name-value pair settings apply to all the plotted lines. To use a different marker size for each line, use separate “plot” commands. For example:
plot(x,x^2,'-k*', 'MarkerSize',20)
hold on
plot(x,x^3,'-ko','MarkerSize',12)
plot(x,x^4,'-k' )
hold off
Accessing the “Line” object:
Alternatively, return the “Line” objects as an output argument from the “plot” function and then set the “MarkerSize” property for each object separately.
p = plot(x,x^2,'-k*', x,x^3,'-ko', x,x^4,'-k' )
p(1).MarkerSize = 20;
p(2).MarkerSize = 12;
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Sreekar Sai Ranganathan le 7 Sep 2021
Is there a way to set this globally at startup for all plots?
For e.g., for line width of plots, I found that adding the following line in startup.m does it. Is there a similar property for the default marker size?
set(groot,'defaultLineLineWidth',1.3);
Sreekar Sai Ranganathan le 7 Sep 2021
Nvm, figured it out. The following works:
set(groot,'defaultLineMarkerSize',4);
Also see this answer, if anyone needs something similar.

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### Plus de réponses (3)

Jan le 30 Avr 2011
plot(x, x^2,'-k*');
hold('on');
plot(x, x^3,'-ko','MarkerSize', 12);
plot(x, x^4,'-k');
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Leo Simon le 22 Mai 2014
For some obscure reason, MarkerSize is not consistently used. When you use scatter, you need to set 'SizeData' instead of 'MarkerSize'. Also, the scale of SizeData is different from that of MarkerSize' E.g.,
h = scatter(rand,rand,'b','filled'); set(h,'SizeData',96);
Michelle Hirsch le 29 Jan 2016
The difference is subtle, but intentional. It stems from the different use cases.
MarkerSize is used to control the overall size of markers, just like the overall width of a line with LineWidth or font size. The units are in points, just like LineWidth.
Scatter is used to actually scale the marker sizes based on data. Specifically, the area of the marker is proportional to the value. This is why the units are in points squared.

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Matt Fig le 30 Avr 2011
To make this type of thing much easier, you could download this code so that all these options are available from a simple mouse click:
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Michelle Hirsch le 29 Jan 2016
You can also enable a context menu for changing line and marker properties just by enabling plot edit mode. Click on the button in the Figure toolbar with an arrow on it, then right click on your line.
Frank Pierce le 1 Sep 2016
yes

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Hari Desanur le 15 Nov 2016
The Marker Size property for a particular line can be set using line object handles. For example -
l = plot(x1,y1,'*-',x2,y2,'*-');
l(1).MarkerSize = 8; % set marker size of 8 for the first line (x1,y1)
l(2).MarkerSize = 12;
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P_L le 18 Avr 2019
Hi there and what if you wanted to chnage the colours of 'ko' data points so that they are filled for example with 'b'
Many thanks

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