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
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