Computing summation in matlab

I have a matrix let say A=ones(144,40);

and I want to compute the summation with lower limit is 1 and upper limit is dimension of A like 144*40=5760.

How can I compute it using symsum or sum other function?

Answer 1

[Wayne King]

 A = ones(144,40);
 B = sum(A(:));

or

B = sum(sum(A));

Answer 2

[Mark Whirdy]

If Wayne is right and you're talking about limits to the summation, is it that you want to control these limits as parameters, or you simply want to always sum over every element (1:(size(A,1)*size(A,2))) of the matrix?

Wayne provides the latter solution, a solution to the former might be

limitSum = @(X,l_b,u_b)(sum(X(l_b:u_b))); % define amonymous function

A = ones(144,40);
limitSum(A,1,size(A,1)*size(A,2)); % apply function to A

[Wayne King]

I think the OP is just referring to the limits of the summation as in

\sum_{n=1}^{N} x[n]

[Algorithms Analyst]

No...it mean when we compute summation this is a lower and upper limit

         5760
like     SUM(A).where is matrix of size 144x40.
          1

Thanks...any help plz

[Algorithms Analyst]

where A is matrix of size 144x40

[Wayne King]

did you look at my answer? that sums all the elements in the matrix

[Mark Whirdy]

then its just a sum as Wayne said