[Jprogramming] Sum of empty vector

[Anssi Seppälä]

Thanks, also the _. indeterminate could be the scalar. This seems to 
be a convention of long history and better to get used to it.
At 19:33 9.7.2006, you wrote:
>Anssi Seppälä:
> >    (+/ % #) 0$0 NB. mean of empty sample is also zero !
> > 0
> >
> > I wonder why (+/0$0)  could not be 0$0 instead of 0 ?
>Because it must be scalar and there is no such thing as empty scalar.
>
>You can use (+/ % $) 0$0
>In this case result will be 1-element vector in case of non-empty list
>argument
>and empty vector in case of empty list argument.
>
>nsg
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