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How do I change the marker size for a plot?

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john birt
john birt ，2011-4-30
评论： Evan ，2023-1-18
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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采纳的回答

Oleg Komarov
Oleg Komarov 2011-4-30
编辑：MathWorks Support Team 2018-11-8
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
Sreekar Sai Ranganathan 2021-9-7
Nvm, figured it out. The following works:
set(groot,'defaultLineMarkerSize',4);
Also see this answer, if anyone needs something similar.

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更多回答（3 个）

Jan
Jan 2011-4-30
plot(x, x^2,'-k*');
hold('on');
plot(x, x^3,'-ko','MarkerSize', 12);
plot(x, x^4,'-k');
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Michelle Hirsch
Michelle Hirsch 2016-1-29
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
Matt Fig 2011-4-30
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:
LINECMENU
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Hari Desanur
Hari Desanur 2016-11-15
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
P_L 2019-4-18
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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