[GAP Forum] List with Holes

[Alexander Hulpke]

Dear Forum,

On Mar 22, 2007, at 6:26 PM, Bruce Colletti wrote:

> If X is a list with holes, how do I find the positions of the holes?

(assuming the list is `x' as `X' is reserved):

Filtered([1..Length(x)],i-> not IsBound(x[i]));

> Thankx.
You're welxome,

     Alexander