Making subplots by reading many files in Matlab

Hello,

I have a question about making subplots in Matab by reading many files in Matlab. First of all, I have a code who reads many .txt files that have my data.

I have files like these: A_ac_s001.txt , A_ac_s002.txt, A_ac_s003.txt ,..., A_ac_s100.txt

and

A_bc_s001.txt, A_bc_s002.txt,...., A_bc_s100.txt .

I have created one loop in order to read the first "team" of my data files and one loop in order to read the second "team" of my data files.

S = dir('A_ac*.txt');

for k = 1:numel(S)

S(k).name

end

S = dir('A_bb*.txt');

for k = 1:numel(S)

S(k).name

end

I would like to create a subplot which will create 2 plots for the first two files of each team with the command subplot(1,2,1) and subplot(1,2,2). But it doesn't work , because the result are two figures. Also I would like the title to be changing for every figure plot( I mean following the loop of my data).

Could anyone help me?

[Adam]

Please include code that you say 'doesn't work' so people don't have to guess. subplot creates axes and plots where you tell it to so you are telling it to do so in 2 figures if that is what you end up with.

[Ivan Mich]

clc
clear

S = dir('A_ac*.txt');
for k = 1:numel(S)
    S(k).name
x=output(:,1);
y=output(:,2);
subplot(1,2,1);
plot(x,y,'LineWidth',1);
xlabel('t')
ylabel('(cm)')

subtitle('%%%%%%%'N1')

end


S = dir('A_bb*.txt');
for k = 1:numel(S)
    S(k).name
subplot(1,2,2);
x2=output(:,1);
y2=output(:,2);
plot(x2,y2,'LineWidth',1);
xlabel('t')
ylabel('(cm)')
end

This is the code. I mean that except from the subplot, I would like the subtitle to be changing every time for each files...

[Adam]

You would be best passing in the figure handle to the subplot call as 'Parent' to explicitly tell it where to create the new axes, e.g.

subplot( 1, 2, 2, 'Parent', hFig )

as far as the titles go, I'm not aware of a function called subtitle, though the title function should assign a title to the specified subplot (again, you are best keeping hold of the axes handles returned from subplot and passing these explicitly to the title function. This would need to be called in the loop if you want it to keep changing, although I imagine this would happen so fast it would be somewhat pointless unless you have a breakpoint and are taking screen captures or similar.

[Stephen23]

Also note that your code does not import any file data and ignores the filenames entirely.

Most likely you should use those names to import that file data:

https://www.mathworks.com/help/matlab/data-import-and-export.html

[Ivan Mich]

Excuse me but i dont understand the hFig you use in the command.

[Adam]

It's just a variable name I usually use for a figure handle returned when you create a figure.

Answer 1

[Constantino Carlos Reyes-Aldasoro]

Perhaps it is not working because other problems:

subtitle('%%%%%%%'N1')

The title of a subplot is still title and the argument should be a string, if N1 is a number this would go like this

title(strcat('%%%%%%%',num2str(N1)))

[Ivan Mich]

I want the title of the first plot to be "Number 001" for example. The number of the second plot to be "Number 002". Imean i would like the title to be change according to the loop

Answer 2

[Constantino Carlos Reyes-Aldasoro]

Ok in that case you will have something like

>> for k=1:9
name = strcat('Number_00',num2str(k))
end

name =
    'Number_001'

name =
    'Number_002'

name =
    'Number_003'

name =
    'Number_004'

name =
    'Number_005'

name =
    'Number_006'

name =
    'Number_007'

name =
    'Number_008'

name =
    'Number_009'

That of course will only work up to 9, but you can use an "if" to have a different line if k>9.

[Adam]

If you are in a recent enough version of Matlab that has strings then

"Number_00" + ( 1:9 )

should work too.