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# Summing Values in Matrix

## Summing Values in Matrix

(OP)
Does anyone know how I can add all the values in a i,j matrix. I want my program to generate a matrix using the following:

i =: 1..n
j =: 1..m

Matrices can be created for numerous values of n and m. An example is shown below:

L(i,j) = i*j

Where i and j are the indices, not functions for L. This creates a create a n x m matrix which is what I want but I want my MathCAD program to sum all values in the Matrix L for various i and j values. For instance if n=2 and m=2,

L = [ 1  2:
2  4]

I want my value for the sum equal to 1 + 2 + 2 + 4 = 9.
Note I set my Array Origin to 1. Any help would be greatly appreciated.

### RE: Summing Values in Matrix

Why can't you use the summation function from the Calculus Toolbar?

TTFN

### RE: Summing Values in Matrix

(OP)
I have worked with the summation function for some time now. I thought i could not define matrices using this approach but apparently I wasn't defining the function correctly. Thank you for your help. I figured it out.

### RE: Summing Values in Matrix

If you have large matrices, and/or have a lot of them to sum, you might find that

rows(L)*cols(L)*mean(L)

is quicker than using the summation operators.  It is on my PC in ver 11.2a.

Jon

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