I need to sum all elements of an array. Is there a function that does this?
Yes there is a function. It is on the ribbon at Maths | Operators And Symbols | Operators | Calculus.
This for an "array" rather than just a "vector"
The summation symbol Terry pointed you to only works with column and row vectors (matrices with either just one column or just one row).
In case you are looking for the sum of all elements of an arbitrary matrix, here are two shorter routines which do the job:
And here is a way to sum up recursively all scalars even in multiple nested matrices (for whatever that may be worth).
Worksheet in format P5 attached
You could also do the following for matrices (though not nested matrices):
Or, to be independent of ORIGIN and of the size of the array/Matrix:
Prime 3.1 file attached
OK, here sure are many ways to skin a cat.
Even though DJV doesn't show any interest, here are two more ways to achieve the desired result.
Personally I still would prefer my first one, "SumAll1". It also seems to be the fastest, followed by the recursive "SumAll3".
Worksheet in Format P5 attached.