How do I fix error: Index exceeds matrix dimensions?

2016 2 3
2 个回答
更新时间：2021 8 20
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I want to make a loop where I calculate the mean of my 35040x12datamatrix for every 24 datapoint, but I get an error: Error using dataset/subsref (line 616) Index exceeds matrix dimensions.
for i=1:24:35040
Xday(icount,:)=mean(A.data(i:24*i,:));
icount=icount+1;
end
What am I doing wrong? Thanks

回答（2 个）

James Tursa
James Tursa 2016-2-3
编辑：James Tursa 2016-2-3

0 个投票

Try this:
for i=1:24:35040
Xday(icount,:)=mean(A.data(i:(i+23),:)); % <-- Changed 24*i to i+23
icount=icount+1;
end
Or a vectorized way:
Xday = reshape(mean(reshape(A.data,24,[])),1460,[]);
Lilja Dahl
Lilja Dahl 2016-2-3

0 个投票

Fantastic! The loop didn't work but vector did! thank you so much

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James Tursa
James Tursa 2016-2-3
编辑：James Tursa 2016-2-3
For the loop, did you preallocate Xday? E.g., Xday = zeros(1460,12). And did you initialize icount = 1?
Lilja Dahl
Lilja Dahl 2016-2-12
Thank you so much for your help. My loop ended up looking like this:
icount=1;
for i=1:24:35040
Xday(icount,:)=missmean(Anew0.data(i:icount*24,:));
icount=icount+1;
end

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