Reference changing field names in loop

Hello all,

I'm working with data coming from 32 probes of the same build, which comes in the form of *.tdms files, one file for every probe. I'm using a Script from this forum to extract the information into a structure:

for i=1:32
    probe(i) = TDMS_getStruct(filename(i));
end

This returns a structure called "probe" with the fields "Property" and "chanel_x", where x is the number of the corresponding probe, and each of these fields has a few subfields. As an example, the data I'm looking for, in the case of the first probe and second probe respectivly, is found in:

probe(1).channel_1.data             % data from probe 1
probe(2).channel_2.data             % data from probe 2

My problem is, that I haven't found a way to access that data in a loop, because the field name "channel_x" is different for every probe and I havn't found a solution yet to call this field for every probe. I'm looking for something like:

for i=1:32
    data(i) = probe(i).channel_(i).data;    %this obviously doesn't work, this is just to show that I need the field name to change in every loop too
end

I know this is similar to changing a variable in every loop, which isn't good programming practice, but here I'm in the situation that I can't do anything about the change in field name for every probe (that's just the way I get the data), so I'm hoping someone here can help me with this issue.

[Stephen23]

https://www.mathworks.com/help/matlab/matlab_prog/generate-field-names-from-variables.html

Answer 1

[Arthur Roué]

You can access a field dynamically by putting the name of the field in a var in brackets.

for i=1:32
    field = sprintf('channel_%d', i)
    data(i) = probe(i).(field).data;  
end

[Jack Foley]

Thank you so much, that worked perfectly!

[Bruno Silva]

Thankk you! It helped me also :D