BUG[?]: ΣLIST, ΠLIST with verrrry short lists

[DrD]

(12-24-2015 08:10 AM)StephenG1CMZ Wrote:  Speaking practically, what does a summation of an empty list mean???

So in practical terms, its not clear what summation of an empty list should return. But it should return a sensible value like 0 or NaN or NULL LIST or NULL STRING, not " Invalid dimension" , which sounds like a program or spacetime failure, not a simple data collection delay in a working program.

The help description for both ΣLIST, and ΠLIST involve "all elements in a list." Restricting a list to the point where its dimension is less than enough to perform the operation, makes the dimension of that list invalid. "Invalid dimension" seems appropriate, to me.

Merry Christmas everyone, and happy calculating in the new year!

-Dale-