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Cleaner way to calculate mean

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Jasmine Karim
Jasmine Karim 2018-8-31
关闭： MATLAB Answer Bot 2021-8-20
I have an array with 18 columns - each column is a cell array itself of varying lengths. I am trying to perform basic calculations with this, finding the mean, but all the cells are divided by different cells. So cell 4/cell 1. Cell 6/3
A = [21x8 cell 46x8 cell 13x8 cell 11x8 cell 27x8 cell 4x8 cell 10x8 cell 77x8 cell 173x8 cell]
I was going to write something similar to what is below, but that would require a lot of repeating lines. Is there a cleaner/more efficient way to write this?
for k = 1:size(A)
for h = 1:length(A)
B = length(A{k,h});
avg.A = (B(a,6)/C(a,3))*100;
avg.B = (B(a,5)/C(a,2))*100;
avg.C = (B(a,4)/C(a,1))*100;
avg.D = (B(a,9)/C(a,3))*100;
avg.E = (B(a,8)/C(a,2))*100;
avg.F = (B(a,7)/C(a,1))*100;
end
end
...and so forth. As you can see, this will produce 18 different lines of code which looks terrible.
  1 个评论
dpb
dpb 2018-8-31
Well, no, "I don't see", at least completely... :)
What is a in
(B(a,6)/C(a,3))*100;
(B(a,5)/C(a,2))*100;
(B(a,4)/C(a,1))*100;
(B(a,9)/C(a,3))*100;
(B(a,8)/C(a,2))*100;
(B(a,7)/C(a,1))*100;
?
Since there's an apparent symmetry in the second subscripts as paired with each other, what's the general rule that determines those?
B=length(A{k,h});
will be a constant so how can it have subscript (a,N).
What is the actual arithmetic computation you're trying to accomplish?
Show us a (small) sample A and then the desired output from it and how got it from the input. It shouldn't take but a small subset of the real problem with small(ish) arrays to illustrate.

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回答（1 个）

Image Analyst
Image Analyst 2018-8-31
I have no idea what B, C, and "a" are, but this will get you the mean of all cells of A
for k = 1 : length(A)
thisCellsContents = A{k}; % Extract double array.
meansOfA(k) = mean(thisCellsContents(:));
end
You could probably do it more compactly, though more cryptically, with cellfun().

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