how to load multiple text files in nested folder?

Hello!

I'm new to matlab -- I am trying to load multiple txt files in a nested folder:

e.g. HCA1/ts/cortex.txt

HCA2/ts/cortex.txt

HCA3/ts/cortex.txt

HCA4/ts/cortex.txt

I want to plot these on the same graph, and I have done this successfully with one subject, but I haven't been able to figure it out with many subjects. If possible, I would love to just be able to use a * or a variable to define all of the subjects, so that i don't have to individually write them in..

Current Code:

%% loading ventricle and cortex ts (make sure you are in the folder of these ts!!!!) and detrending


l = load('lcortex_run01regPA.txt')
v = load('ventricle_run01regPA.txt')
s = load('spinal_run01regPA.txt')

%naming of subject 

name = 'HCA1'

%v_ts = run02_ventricle_segmentation_stcfsl; 
c_ts = l 
v_ts = v 
s_ts = s 

%% detrend ventricle and cortex

d_v_ts = detrend(v_ts)   %detrended time series of ventricle

d_c_ts = detrend(c_ts) %detrended time series of cortex

d_s_ts = detrend(s_ts) %detrended time series of spinal cord

%% defining timeseries x axis - plotting ventricle, cortex, spinal cord -raw fmri signal

whole_ts = 1:478 %your ventricle timeseries 
ttt = whole_ts*.800 %the TR found from HCP mri_info 
figure;
ax1 = subplot(3,1,1)
hold on
plot (ttt, d_v_ts)
plot (ttt, d_c_ts)
plot (ttt, d_s_ts)
hold off
legend('ventricle','cortex','spinal cord')
sgtitle(name)
xlabel('Time')
ylabel('Raw fMRI signal')
%ylim([-170 170])

Thank you!!

Answer 1

[Stephen23]

Probably the sprintf method does what you need:

https://www.mathworks.com/help/matlab/import_export/process-a-sequence-of-files.html

For example, something like this:

D = 'absolute or relative path to the directory where the subdirectories are';
for k = 1:4
    name = sprintf('HCA%d',k); % HCA1, HCA2, etc.
    l = load(fullfile(D,name,'lcortex.txt'));
    v = load(fullfile(D,name,'ventricle.txt'));
    s = load(fullfile(D,name,'spinal.txt'));
    ... your code
    ... you will probably want a SAVEAS or PRINT here.
end