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Reference changing field names in loop

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Jack Foley
Jack Foley 2020-7-24
评论： Bruno Silva 2022-1-6
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.

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采纳的回答

Arthur Roué
Arthur Roué 2020-7-24
编辑：Arthur Roué 2020-7-24
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

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