Loading and naming specific columns

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Anna
Anna 2011-8-30
Hello,
I used this code to import and name data in Matlab:
for i=1951:2000
fileName=['arunoff_' num2str(i)];
dataStruct.(fileName)=importdata([fileName '.txt']);
end
This creates data structure dataStruct.arunoff_(i).data for each year (1951-2000). Next I would like to create and name another set of variables using the third column in 'data' (i.e. dataStruct.arunoff_1951.data(:,3), dataStruct.arunoff_1952.data(:,3) etc.). However, I don't know how to write a loop that does that and was wondering if someone could help me with this? My main problem is I don't know how to tell the loop to use data in each a_runoff(i) structure.
Hope this makes sense, thanks very much for the help!

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采纳的回答

Walter Roberson
Walter Roberson 2011-8-30
fn = fieldnames(dataStruct);
for K = 1:length(fn)
newStruct.([fn 'd3']) = dataStruct.(fn).data(:,3);
end
  2 个评论
Andrei Bobrov
Andrei Bobrov 2011-8-30
Hi Walter!
Little typo.
for K = 1:length(fn)
newStruct.([fn{K} 'd3']) = dataStruct.(fn{K}).data(:,3);
end
Walter Roberson
Walter Roberson 2011-8-30
Good point. I mentally started with K = fn (i.e., iterate over the cells) and didn't clean up properly afterwards.

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更多回答（1 个）

Anna
Anna 2011-8-30
Thank you for your replies Walter and Andrei!
I used the code you supplied and it worked very well. I now have another problem though that I would really appreciate help with. I want to calculate the mean of all the values in each field in 'newStruct'. The values are arranged as one column in each field.
This is the code I tried using:
fn = fieldnames(newStruct); for K = 1:length(fn) Mean.(fn{K}) = mean(newStruct.(fn{K})); end
but I get this error: 'Subscript indices must either be real positive integers or logical'.
Anything you could suggest?

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