MATLAB Answers

How do I loop through a structure field which contains multiple arrays?

11 views (last 30 days)
Hi all,
I have a big structure which contains different substructures.
The structure is called 'subjects' and contains information for each subject.
However, I am interested in angles, which are located in subjects.sessions.trials(1).data.angles.
subjects.sessions.trials(1).data.angles contains 28 fields, all being a 1289x1 double, which all have names of different angles.
I want to plot the 28 angles by looping through, but I cannot manage to select what I need in the for loop:
for i = 1:NSessions
figure();
plot(subjects.sessions.trials(i).data.angles. ......);
end
Attached is a snapshot of what the structure field looks like.matlab.PNG
I tried creating a cell array with the 28 names and then use
for i = 1:NSessions
for k = 1:NAngleName
figure();
plot(subjects.sessions.trials(i).data.angles.AngleName{k});
end
end
But this is not working.
Thanks in advance.

  2 Comments

Inti Vanmechelen
Inti Vanmechelen on 4 Jan 2019
Thank you for your response KSSV.
I did read about getfields, but using 'getfields' still gives me 1x1 struct containing 28 fields which are all 1289x1 doubles. And it is those 1289x1 doubles which I would like to select, which is currently not workin out.

Sign in to comment.

Accepted Answer

Daniele Mascali
Daniele Mascali on 4 Jan 2019
If you want to make your last attempt work, you might use eval:
eval(['plot(subjects.sessions.trials(i).data.angles.',AngleName{k},');']);

  3 Comments

Daniele Mascali
Daniele Mascali on 4 Jan 2019
You are right.
However, I was not aware of Dynamic Field References. One very simple solution is
plot(subjects.sessions.trials(i).data.angles.(AngleName{k}));
Thanks for the link!!

Sign in to comment.

More Answers (0)


Translated by