Hey all,
I came up with this version:

<:@(i.~ {"0 1 +/\@|:@=) 1 2 1 1 2

Best regards,
Jan-Pieter

On Wed, 28 Mar 2018, 22:02 Raul Miller, <[email protected]> wrote:

> This?
>
>    (/: /:~ ;@(<@i.@#/.~))1 2 1 1 2
> 0 0 1 2 1
>
> --
> Raul
>
>
> On Wed, Mar 28, 2018 at 2:32 PM, Joe Bogner <[email protected]> wrote:
> > I think this is an easy one but it's escaping me. How to calculate a
> > running count of an item in a list?
> >
> > runct (1,2,1,1,2) -: 0,0,1,2,1
> > runct (5,6,5,5,6) -: 0,0,1,2,1
> >
> > This seems to be a good start
> >
> >  = (5,6,5,5,6)
> > 1 0 1 1 0
> > 0 1 0 0 1
> > ----------------------------------------------------------------------
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> ----------------------------------------------------------------------
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