Problem concatenating two strings

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I have three files (attached). I need the for loop to extract the part of each file name between the hypens into separate fields of the structure data_vel. Here is my script:
data_vel{1}.files = dir(fullfile(pwd,'*.txt'));
for j = 1:length(data_vel{1}.files)
data_vel{1}.file_name{j,1} = data_vel{1}.files(j).name;
data_vel{1}.id{j,1} = extractBetween(data_vel{1}.file_name{j},'-','-');
data_vel{1}.field_name(j) = strcat('loc_',data_vel{1}.id(j));
data_vel{1}.(data_vel{1}.field_name(j)).velocity_exist = 'yes';
I am getting an error, which I think is caused by this line
data_vel{1}.field_name(j) = strcat('loc_',data_vel{1}.id(j));
I want this line to add "loc_" to the beginning of each data_vel{1} value. So, I want "loc_1A", "loc_3B", and "loc_9C" to be created, which I would then assign as field names in the data_vel{1} structure. Currently, This line produces a 1x2 cell instead of a 1x1 cell. I haven't been able to figure out how to create a 1x1 structure.
Can someone please help?

Accepted Answer

dpb on 27 Jul 2022
Edited: dpb on 27 Jul 2022
I hate struct, but if I understand the Q?, then try something like --
fnv=[fn; cell(1,numel(fn))];
which results in
>> deal_vec =
struct with fields:
loc_1A: []
loc_3B: []
loc_9C: []
  1 Comment
Allen Hammack
Allen Hammack on 28 Jul 2022
You solved the problem! Thank you so much!

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