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Loading in excel data with loop and plotting

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Benjamin
Benjamin on 12 Nov 2018
Edited: Benjamin on 12 Nov 2018
I took 2 pieces of code and tried to put them together, but it did not work.
When I load in data like this:
S=struct;
S.A600= xlsread(filename,'0.600');
S.A601= xlsread(filename,'0.601');
etc.
and
then do this:
fn = fieldnames(S);
for k = 1:length(fn)
thisS = S.(fn{k});
x = thisS(:, 1);
y = thisS(:, 2);
fprintf('Printing field #%d.\n', k);
semilogy(x, y,'-o');
hold on
drawnow;
end
Everything works fine, namely because fn is defined correctly. Here, fn is 20x1.
But when I try to load data in with a loop and do this:
filename = 'C:\PATH\variable_analysis.xlsx';
S=struct;
for n=20:-1:1
A= xlsread(filename,sprintf('0.6%02d',n));
S(n).data=A;
end
fn = fieldnames(S);
for k = 1:length(fn)
thisS = S.(fn{k});
x = thisS(:, 1);
y = thisS(:, 2);
fprintf('Printing field #%d.\n', k);
semilogy(x, y,'-o');
hold on
drawnow;
end
grid on;
fn is only a 1x1 cell, so only 1 dataset is plotted.
I know I am making an obvious error somewhere, but I cannot find it.

  6 Comments

Show 3 older comments
Benjamin
Benjamin on 12 Nov 2018
Thanks for the effort, but still did not solve it. fn = size(S,1) just produces fn = 1, so it still only plots one dataset. S is a 1x20 struct, with 18x49 arrays.
Bob Nbob
Bob Nbob on 12 Nov 2018
If S is 1x20 then you need to use fin = size(S,2). In the size command the number indicates which dimension you're looking at.
Also, now that I'm looking at it again. You don't actually need fn at all. Just replace the loop index with 'for k = 1:size(S,2)' and then use S(k).data in the loop.

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