Re: [bug-gawk] How to mimic inserting an element to a vector?

[Wolfgang Laun]

I thought there ought to be a function like length for arrays, but the
manual (Hint, hint!) doesn't mention it in the array section, and I've
learned it in the early days.
-E

On Thu, 11 Jul 2019 at 20:35, <address@hidden> wrote:

> Your way seems to work. I would probably write it like this
> (untested):
>
> function insert(a, ind, val,    i, l)
> {
>         l = length(a)
>         for (i = l; i >= ind; i--)
>                 a[i+1] = a[i]
>
>         a[ind] = val
> }
>
> Arnold
>
> Peng Yu <address@hidden> wrote:
>
> > Hi,
> >
> > I use the following code to mimic inserting an element to a vector
> > (i.e, the keys are 1,2,...). But it is a little cumbersome. Is there
> > any implement that is better?
> >
> > function insert(a, i, v) {
> >   for(k in a) {
> >     if(k>=i) {
> >       a[k+1] = a[k]
> >     }
> >   }
> >   a[i] = v
> > }
> >
> > BEGIN {
> >   for(i=1;i<=3;++i) {
> >     a[i] = 100 + i
> >   }
> >   PROCINFO["sorted_in"] = "@ind_num_desc"
> >   insert(a, 2, 2)
> >
> >   PROCINFO["sorted_in"] = "@ind_num_asc"
> >   for(k in a) {
> >     print k, a[k]
> >   }
> > }
> >
> > --
> > Regards,
> > Peng
>
>
>