# How can I use plus operation with more than 2 array

3 views (last 30 days)
Wongnarin Kompor on 1 Feb 2016
Commented: David Young on 3 Feb 2016
I try to plus with many array. For example plus(A,B,C,D,...Z) with A = [1,2,3:4,1,2] B = [3,5,6,:5,6,7] and so on and I've got this message
"??? Error using ==> plus Too many input arguments."

Stephen Cobeldick on 1 Feb 2016
plus is a binary operator, the documentation shows this and does not state otherwise. You will need to perform it multiple times.
Wongnarin Kompor on 2 Feb 2016
Thank you for suggest me

Walter Roberson on 1 Feb 2016
There is no way of doing that in MATLAB: you need to do a series of binary plus operations, A+B+C+....
You may wish to consider:
nd = ndims(A);
sum( cat(nd+1, A, B, C, .... Z), nd+1 )
Note: this code will not work if any of the elements are scalars, unless they are all scalars. All of the matrices need to be the same size for this code to work.

Wongnarin Kompor on 2 Feb 2016
Thank you very much
David Young on 3 Feb 2016
If the arrays are large, this makes extravagant use of memory.

David Young on 1 Feb 2016
Either use
A + B + C + D + Z
or
plus(A, plus(B, plus(C, plus(D, Z))))