How to graph data in cells?

Hello!

I wrote a function called transformdata and I recently got some help being able to run that function for all the csv files I have in a folder (https://au.mathworks.com/matlabcentral/answers/555148-how-to-run-a-code-for-all-files-in-a-folder?s_tid=mlc_ans_email_ques). The output matrix of this function is three columns; the first is time, the second is acceleration and the third is velocity. Once I run the function on all the csv files the output is a cell, which contains the output matrix from the function for all the different csv files. Is there a way to graph all the output matricies from the cell on one graph, using the time column from the output matricies as the x-axis and then plotting the acceleration and velocity?

Am a real matlab beginner so any help would be great!

Thanks!

[Turlough Hughes]

Hi Hilary, could you attach the cell array as a .mat file. To save the variable, right click on it in the Workspace window and click Save as...

Also, as a beginner I recommend that you spend some time looking at the introductory onramp course for MATLAB.

[Hilary Kada]

Sure! Currently I've only been running this entire thing for a small sample of the data I have (in reality each data set is like 4000+ rows long and there's about 40+ sets of data), and so not all the matricies in the cell array will be the same size when I run it for the real data.

Haha yes thanks, I'll give that a go!

Answer 1

[Turlough Hughes]

Your data has an empty cell in it so the first step here is to remove that

ToBeGraphed(cellfun(@isempty,ToBeGraphed))=[]; % remove empty cells

You can then graph as follows:

figure(), hold on
cellfun(@(x) plot(x(:,1),x(:,2)),ToBeGraphed)
ylabel('Acceleration')
yyaxis right % or replace with: figure(), hold on
cellfun(@(x) plot(x(:,1),x(:,3)),ToBeGraphed)
ylabel('Velocity')
xlabel('Time')

Replace the 4th line as indicated above if you'd like to have velocity and accelerations on seperate figures.

[Hilary Kada]

Oh my god thank you so much that's exactly what I needed! You're a damn lifesaver and straight up saved me like a billion hours of manually graphing each data set on excel. Thanks!

[Turlough Hughes]

No problem 😊