Re: [Tcllib-devel] Tcllib Release 1.8 Status and Action Plan

[Arjen M. <arj...@wl...>]

Hello all,

I was just checking the various bug reports that are assigned to me
and I came across one (bug 1151935) that made me think:

In general what should happen if a mathematical function is to be
evaluated for a set of argument for which it is not defined?

In this case, the bug is that there is a division by zero and 
this is reported as such, rather than as a clearer message
that the coefficient of variation is not defined if the mean
of the data is zero.

My question:
- Should the function return such a (clearer) message or
- Should it return an empty string (not an error) thereby
  leaving it to the caller to handle the _undefined_ 
  situation

I can argue either way, but we should probably try for a
consistent practice.

Regards,

Arjen