SUM function
Description
Sum function. SUM(range) computes the sum of the contents of the cells in the specified range.
The argument range can be a list of numbers, cell addresses, cell ranges (such as A1:A10).
Range can also be a matrix. In that case the function returns a matrix with one row and the same number of columns, with each element the SUM of the corresponding column. If Range is a row matrix, it is converted to a column matrix first.
Example
SUM(A1:D8) calculates the sum of the contents of cells A1 to A8.
