Re: Plotting anomaly with a staircase function
- To: mathgroup at smc.vnet.net
- Subject: [mg114764] Re: Plotting anomaly with a staircase function
- From: "Nasser M. Abbasi" <nma at 12000.org>
- Date: Thu, 16 Dec 2010 05:49:21 -0500 (EST)
- References: <ieado1$rbs$1@smc.vnet.net>
- Reply-to: nma at 12000.org
On 12/15/2010 4:53 AM, rebcabin wrote: > Hello -- I was investigating a staircase function derived from a > representation of a parametric polyline (concept from Differential > Geometry), and found some plotting anomalies. In particular, sometimes > the "risers" of the stair steps are slanted instead of the expected > vertical. I did some fuzz testing of my function and was unable to > find an anomaly numerically amongst a million random inputs. I > compared my staircase against a different form built from the Matheamtica > built-in UnitStep, and that second form does NOT show the anomaly. I > boiled everything down to the smallest possible notebook I could, and > would be grateful for advice from the community, if anyone has a > moment to look at it. There should be nothing difficult or subtle, > here, which makes it all the more puzzling! > > Notebook posted below. > > https://docs.google.com/leaf?id=0B4v0MzmZfdm8MWRlYzk3NTEtMDAzZi00YzM4LTkyZTEtYjM2ZjIxMjc4MTFk&hl=en&authkey=CPOwrzA > I ran your notebook in V 8, and I do not see the anomaly, here is a screen shot: http://12000.org/tmp/dec_15_2010/stairs.png --Nasser
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