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  1. or download this
    pdl> p rvals(19,19,{Centre=>[5,4]}) <= 6

...
 [0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0]
]
  2. or download this
    pdl> $frame = zeroes 19,19
pdl> ($x,$y,$r,$xmax,$ymax) = (5,4,6,dims $frame)
...
]

pdl>