[GAP Forum] Need help with Lists

[Alexander Konovalov]

Dear GAP Forum,

On 11 Jun 2007, at 14:45, muniru asiru wrote:

> I need help.
>
> While working with Gap, I came accross the following
> list of list of list with 10,3 and 7 items
> respectively.  My interest is to REPLACE (please note)
> this list of list of list (a5, below) with a list of
> list so that I will have 30 elements made up of 7
> elements in each list of list.
>
>
> Thank you

A straightforward suggestion would be to use 'Concatenation':

gap> a5 := Concatenation( a5 );;
gap> Length( a5 );
30
gap> ForAll( a5, x -> Length(x) = 7 );
true

Best,
Alexander