Mean value in a cell array

2014 10 11
2 个回答
回答已采纳
更新时间：2014 10 11
1 次查看（30 天）

0 个投票

Hi!
I have a 16x8 cell (containing 6x11 cells) with the name FinalResult. I now would like to calculate the mean value of FinalResult{1:16,4}(1,2) and have tried it with
cellfun(@mean,FinalResult{1:16,4}(1,2))
but this will give me the error message "Bad cell reference operation". Where is the mistake?
Thank you in advance for any help.

请先登录，再回答此问题。

 采纳的回答

Guillaume
Guillaume 2014-10-11
编辑：Guillaume 2014-10-11

1 个投票

I'm assuming that the cell array contains matrices not more cell arrays, that is the 6x11 are actually matrices. In which case, this would work:
mean(cellfun(@(c) c(1,2), FinalResult(:, 4)));
What it does is:
  1. Create a cell array that is a subset of your whole array with FinalResult(:, 4). Note that I use () instead of {}. The former returns a cell array, the latter a list of elements.
  2. Iterate over that subset and extract element (1, 2) of each matrix, with cellfun.
  3. get the mean of the elements returned by cellfun

更多回答（1 个）

SK
SK 2014-10-11
编辑：SK 2014-10-11

2 个投票

Put square brackets around the cellarray contents like:
M = [FinalResult{1:16,4}]
m = mean(M,2);
Putting the square brackets converts it into a matrix.

3 个评论
显示 1更早的评论 隐藏 1更早的评论

Pinga
Pinga 2014-10-11
Hi SK
Thank yo for your reply. This was not the solution I am looking for, since I want to calculate the mean of all (1,2) of every double (not column) in the cell FinalResult{1:16,4}. So, basically this is what I want to calculate:
((FinalResult{1,4}(1,2))+(FinalResult{2,4}(1,2))+(FinalResult{3,4}(1,2))+....+(FinalResult{1,16}(1,2)))/length(FinalResult)
Any help would be appreciated.
SK
SK 2014-10-11
OK, I didn't read the question properly.
In that case:
C = FinalResult(1:16, 4);
D = [C{:}];
E = reshape(D, [6,11,16]);
M = cell2mat(E);
Mx = mean(M,3);
Mx(i,j) should then contain the mean of the index (i,j).
Pinga
Pinga 2014-10-11
Thank you! Unfortunately, I got a error message for M ("Cell contents reference from a non-cell array object"). But the solution from Guillaume works - problem solved.

请先登录，再进行评论。

类别

在 帮助中心 和 File Exchange 中查找有关 Loops and Conditional Statements 的更多信息

产品

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by