Arithmetic in Cell Arrays

I have the following variables in Cell arrays. b_x{k}, x{k}, c{k}.

I want to perform the following operation within the cell array.

D{k} = sqrt((b{k} - x{k}).^2 + (c{k}).^2)

When doing this I realize that these arithmetic operations cannot be done through a cell array. So do I have to do it using generalized operations such as gadd, gsubtract etc? If yes then for the element wise square should I use 'gmultiply' twice? Is there no other way?

Thanks

Answer 1

[Walter Roberson]

D = cellfun( @(B, X, C) sqrt((B - X).^2 + C.^2), b, c, x);

[CX]

Why is there B, X, C and b, c, x? Please explain?

[Walter Roberson]

Your b, c, and x are your cell arrays. cellfun is going to step through corresponding locations in the cell arrays, b{5} with c{5}, x{5} for example, and pass those values as arguments to the anonymous function of three arguments @(B, X, C) sqrt((B - X).^2 + C.^2) . The B and X and C received in the anonymous functions are specific values extracted from the cell array, rather than the cell arrays as a whole. If I had used the variable names b, x, and c within the anonymous function, you would have gotten confused between the cell arrays as a whole and individual values extracted from the arrays.

Answer 2

[Image Analyst]

Try using cell2mat(), or just avoid using cell arrays and use numerical arrays in the first place. Why do you need cell arrays? Are you storing mixed data, such as numbers with an associated string?

[CX]

Yes. I tried using cell2mat but that didnt work either. The reason I'm using cell arrays is that I want to perform the same mathematical operation on data stored in multiple folders.

[Image Analyst]

That is not a reason for using cell arrays. You can use regular arrays for b, x, and c, though if they have different lengths in each folder then D will have to be a cell array. Please give an example of them for two different folders.

[CX]

I will try the procedure you suggested and get back to you

Thanks