MATLAB Answers

Sub-plots properties

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SS
SS on 12 Feb 2020
Commented: Rik on 12 Feb 2020
Hi. I have 4 MATLAB figures, using them as sub-plots I want to create a new figure. These 4 figures have a larger marker size and line width.
How can, I change/modify the line width, marker size in these subplots? I want to add labels "a, b, c, d" on the bottom left of figure. Also, I want to add some text on top left corner of each sub-plot figure.

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Accepted Answer

Behzad Navidi
Behzad Navidi on 12 Feb 2020
Hello SS,
First I recommend reading this useful documentation.
In this case you want 4 subplots, so you subplots should be in subplot(2,2,1); subplot(2,2,2); subplot(2,2,3); subplot(2,2,4). as you can see the first and the second number is constant because you want 4 subplots. In fact, 2 and 2 define you want 2 in the row and 2 in the column which is four actually. the second number 1,2,3,4 adjusts the place of your subplots among each other. you can found more explanation in the document that I was mention above.
then you can consider each subplot as a plot and do what ever you previously doing in plot, like marker size changing.
In your case you can use this:
figure;
%first subplot
subplot(2,2,1);
plot(something, 'linewidth',1); %instead of 'something' write your data. you can set linewidth
xlabel('something')
ylabel('something')
%put text box code for each subplot here (read above for more information)
%second subplot
subplot(2,2,2);
plot(somehting, 'linewidth',1);
xlabel('something')
ylabel('something')
%third subplot
subplot(2,2,3);
plot(somehting, 'linewidth',1);
xlabel('something')
ylabel('something')
%fourth subplot
subplot(2,2,4);
plot(somehting, 'linewidth',1);
xlabel('something')
ylabel('something')
You can add a text box for each subplot just under the end of code for each other using the useful information in this question:
For example as you can see in this question:
figure;
plot(1:10); % create a simple line plot
a = gca; % get the current axis;
% set the width of the axis (the third value in Position)
% to be 60% of the Figure's width
a.Position(3) = 0.6;
% put the textbox at 75% of the width and
% 10% of the height of the figure
annotation('textbox', [0.75, 0.1, 0.1, 0.1], 'String', "pi value is " + pi)

  2 Comments

SS
SS on 12 Feb 2020
Hi, thanks for your reply. Actually, I already have four MATLAB fig files and they have some fixed linewidth and marker size. I want to modify them while plotting them as sub-plots.
Rik
Rik on 12 Feb 2020
Then you don't have subplots.
You can dig through the children to find the line objects, or use findobjs to do that.

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More Answers (1)

Bhaskar R
Bhaskar R on 12 Feb 2020
subplot(1, 2,1), plot(1:10);
subplot(1, 2,2), plot(2*1:10);
ax = gca; % using gca fields you can do
ax.Children.Marker = 'you can set here'

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Rik
Rik on 12 Feb 2020
A better habit would be to store the output of the subplot call to store the handle to the axis.
For directly editing the plot properties you could also consider storing the handle to the line object that the plot function returns.

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