MATLAB: Finding mean for an array

cell arrays

Hi all, Just wanted to find mean for an array thnx

Best Answer

For numeric arrays:

mean(NumericArrayName(:))

I see, though, that you tagged this with "cell arrays". If you are wanting to find the mean for each cell separately, then:

cellfun(@(C) mean(C(:)), CellArrayName)

If you are wanting to find the mean of all of the cells taken together as if they were one long list of numbers:

t = cellfun(@(C) C(:), CellArrayName);
mean(vertcat(t{:}))

I am presuming in the above that when you say that you want to find the mean for an array, that you want the mean of all of the numbers in the array together. If you want the mean of the rows of an arithmetic array, then mean(NumericArrayName,2) and if you want the mean of the columns then mean(NumericArrayName)

But if what you have is a cell array containing a series of numeric arrays all the same size, and you want a position-by-position mean over all of the cells, then:

nd = ndims(CellArrayName{1});
mean(cat(nd, CellArrayName{:}), nd)

Related Solutions

MATLAB: How to repeat a cell

Does it just occur once?

x = {'b','c','d','e','f','a','y','z','h','i','j'};
x = x(:);
y = cell(length(x)+1,1);
idxarray = strcmp(x,'a');
idx = find(idxarray == 1);
y{idx+1} = 'a';
y(1:idx) = x(1:idx);
y(idx+2:end) = x(idx+1:end);

MATLAB: How to to write a code to the n*1 matrix into differnt submatrices

Can you give a small example matrix and what you expect the output to be?

It is still not clear what you want. I asked you to provide input and output. You provided input, but no output. How would you group these, in a cell array?

Here is a guess:

A = [164
165
166
167
175
176
177
189
190
195
196];
T = [1;diff(A)]==1;
t1 = [1 findstr((T).',[0 1])];
t2 = [findstr((T).',[1 0]) length(T)];
H = cell(1,length(t1));
for ii = 1:length(t1)
   H{ii} =  A(t1(ii):t2(ii));
end
R = num2cell(A(~ismembc(A,cat(1,H{:}))));
H(end+1:end+length(R)) = R

EDIT

A one-liner (FWIW):

groups = mat2cell(A,diff([0;find(diff(A) ~= 1);length(A)]),1);

Best Answer

Related Solutions

MATLAB: How to repeat a cell

MATLAB: How to to write a code to the n*1 matrix into differnt submatrices

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