[Jprogramming] Hilbert Curve error

[David Lambert]

I pasted these four lines into j904 linux, resulting in a hilbert curve 
plot.  I've got to believe that your session history simply doesn't 
include the iter definition.

Re: Programming Digest, Vol 202, Issue 26
> iter=: (, 1 , +@|.) @: (,~ 0j_1 ,~ 0j_1*|.)
>
> hilbert=: {{0j1+(%{:) +/\0,iter ^: y ''}}
>
> require 'plot'
>
> plot hilbert 5