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[?] Meaning of a strange curve on surface - 3DPlot ?

Gennaro Arguzzi
Posted 8 years ago

Hello everyone. What is the meaning of the following zig-zag curve on the surface?

enter image description here

Plot3D[(t/(2 e)) (HeavisideTheta[t + e] - 
    HeavisideTheta[t - e]), {t, -3, 3}, {e, -2, 2}, 
 AxesLabel -> {t, e}]

Thank you very much.
POSTED BY: Gennaro Arguzzi
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Anonymous User
Anonymous User
Posted 8 years ago

I asked myself the same question by seeing your post, thank you for these details.
POSTED BY: Anonymous User

It is probably amplified background numerical noise due to machine-number precision. The z values are or the order of 10^-16. Compare:

Plot3D[(t/(2 e)) (HeavisideTheta[t + e] - 
    HeavisideTheta[t - e]), {t, -3, 3}, {e, -2, 2}, 
 AxesLabel -> {t, e}, PlotRange -> All]

The automatic value for PlotRange comes out abnormally small in this case.
POSTED BY: Gianluca Gorni
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