Thanks, Neil. On Saturday, August 4, 2012 <x-apple-data-detectors://32>, Neil Toronto wrote:
> On 08/03/2012 11:59 AM, Doug Williams wrote: > >> (require plot) >> >> (plot (contour-intervals >> (lambda (x y) >> (define z (- x y)) >> (cond ((< z -1) -1) >> ((> z 1) 1) >> (else z))) >> -2 2 -2 2)) >> >> ... >> >> Why is the lower white triangle not colored red - they definitely have >> a value of 1? It's like those points are completely ignored. >> > > Turns out it was an error in the marching squares (intervals) > implementation: a `<' should have been a `<=' to make an upper test > symmetric with the corresponding lower test. > > I've pushed the fix. Thanks again! > > Neil ⊥ > > _________________________ > Racket Developers list: > http://lists.racket-lang.org/**dev <http://lists.racket-lang.org/dev> >
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