How to loop through variable names and to save them on one file?

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JMSE
JMSE 2021-8-4
评论： JMSE 2021-8-5
Hi, I have written this loop which works fine, however I want to perform this for certain variables in the data_measured csv file. Currently, this loop performs well for the WD__Avr variable. Hence, I would like to define the variable = x before the loop and just replace it with "t.'variable" within the loop. Any suggestion?
Thanks for your help!
for i = 1:height(unique(data_timesteps.Date))
ind_dt = find(data_timesteps.Date == dates(i));
t = table(data_timesteps.Time(ind_dt), zeros(sum(data_timesteps.Date == dates(i)),1));
header={'Time','WD_Avr'};
t.Properties.VariableNames = header;
for j = 1:(sum(data_timesteps.Date == dates(i)))
if j == 1
ind_time = find(data_measured.Time <= data_timesteps.Time(j) & data_measured.Date == dates(i));
ind_time = ind_time(end-10+1:end);
x = mean(data_measured.WD__Avr(ind_time));
t.WD_Avr(j) = x;
data_timesteps.WD(ind_dt) = t.WD_Avr;
else
ind_time = find(data_measured.Time <= data_timesteps.Time(j) & data_measured.Time > data_timesteps.Time(j-1) & data_measured.Date == dates(i));
x = mean(data_measured.WD__Avr(ind_time));
t.WD_Avr(j) = x;
data_timesteps.WD(ind_dt) = t.WD_Avr;
end
end
end

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采纳的回答

Jeff Miller
Jeff Miller 2021-8-5
You can use strings for variable names like this:
a = 'WD__Avr';
for....
[...]
x = mean(data_measured.(a)(ind_time)); % note parentheses around 'a'
[...]
...end
You might make a cell array with the different strings you want for 'a' and then loop through assigned each one to 'a' to process the different variables.

更多回答（1 个）

Sulaymon Eshkabilov
It looks that will require another loop outside the main loop, something like this one, e.g.:
for i = 1:height(unique(data_timesteps.Date))
ind_dt = find(data_timesteps.Date == dates(i));
x.Time(i) = data_timesteps.Time(ind_dt);
end
  1 个评论
JMSE
JMSE 2021-8-4
Thank you very much. Unfortunately, I cannot see how this solves my issue. Actually I only want to name the table.variable in such a manner that 'variable' changes through the loops.
I have tried different versions of:
a = WD__Avr
for....
[...]
x = mean(data_measured.a(ind_time));
[...]
...end
which does not assign work. This might be quite blatant; I am sorry - quite new to matlab.
Thanks!

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