How to subtract number inside cell

Hi ,

For example I have 2 arrays. A and B.

A= 2x1 cell

inside A > [32,28,30,31] [27,29,30]

B 2x 1 cell

inside B > [30,64,72,85] [15,33,62]

I want to do subtract for A-B in each entry. The expected results are C: 2x 1 cell > [2,-36,-42,-54] [12,-4,-32]

How do I do this?

Thank you

Answer 1

[Stephen23]

A = {[32,28,30,31],[27,29,30]};
B = {[30,64,72,85],[15,33,62]};
C = cellfun(@minus,A,B,'uni',0)

C = 1×2 cell array
    {[2 -36 -42 -54]}    {[12 -4 -32]}

[Ahmad Bayhaqi]

Hi @Stephen Cobeldick

I used that one but

Why I got this warning below ?

"Error using cellfun

Undefined function 'minus' for input arguments of type 'cell'."

[Ahmad Bayhaqi]

in my case, the array :

A(2x1 cell)= {[32,28,30,31]} {[27,29,30]}

B(2x1 cell)={[30,64,72,85]}{[[15,33,62]}

[Stephen23]

It works for me:

A = {[32,28,30,31],[27,29,30]};
B = {[30,64,72,85],[15,33,62]};
C = cellfun(@minus,A,B,'uni',0)

C = 1×2 cell array
    {[2 -36 -42 -54]}    {[12 -4 -32]}

You would get that error if both your description and examples are incorrect, and you actually have nested cell arrays, e.g. in R2021b:

B = {{30,64,72,85},{15,33,62}};
C = cellfun(@minus,A,B,'uni',0)

Error using cellfun
Operator '-' is not supported for operands of type 'cell'.

Or in R2013b (note the error message text change):

>> C = cellfun(@minus,A,B,'uni',0)
Error using cellfun
Undefined function 'minus' for input arguments of type 'cell'. 

Answer 2

[Image Analyst]

Try a simple and intuitive for loop:

A = {[32,28,30,31],[27,29,30]}
B = {[30,64,72,85],[15,33,62]}

% A for loop works:
[rows, columns] = size(A)
for col = 1 : columns
	C{col} = A{col} - B{col}
end
% Stephen's method also works, at least in R2021a.
C2 = cellfun(@minus,A,B,'uni',0)

Of course you could also check the dimensions and make sure they're the same before you subtract, and throw up a "friendly" error message if they don't match, rather than barf up a screen of red error messages.