问题
How can I make the sum of values in an MxN cell array? I used cellfun('sum',CellArray{i})
in which, i refers to the MxN index of the CellArray. But because I used it in a loop to count the number of blocks, it gives me error for being out of index.
What's the right way to do that please?
回答1:
I don't know if I got your problem entirely right. You just want the total sum of all elements of a cell array? Assuming they are doubles, you first need to transform your cell array into a matrix, and then you can use the normal sum function.
% example data
xCell = num2cell( magic(10) )
gives you a a 10x10 cell array with some magic numbers from 1 to 100. The following creates a column-vector of all cell contents and sums them up:
S = sum([xCell{:}])
S =
5050
which is the result good ol' Mr. Gauss didn't need Matlab for.
Alternatively if you're interested in the sum of all single rows or columns, you can use:
S = sum(cell2mat(xCell),dimension) % dimension = 1 or 2 (or 3)
regarding your comment in your follow-up question, that you actually have complex doubles:
use:
S = sum( real( [xCell{:}] ) )
来源：https://stackoverflow.com/questions/20565290/how-to-sum-the-values-of-an-mxn-cell-array