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Hole/Disk function

• To: mathgroup at smc.vnet.net
• Subject: [mg76024] Hole/Disk function
• From: Mathieu G <ellocomateo at free.fr>
• Date: Tue, 15 May 2007 04:45:55 -0400 (EDT)

Hello,
Is there a better way to define a Disk/Hole function than that?:

DHole[x_, y_] := If[Sqrt[x^2 + y^2] <= HoleSize, 1, 0];

I would like to use it for a convolution using the definition as shown 
in http://oldsite.vislab.usyd.edu.au/CP3/Four5/mod2-01.gif

Best regards,
MG

• Follow-Ups:
  • Re: Hole/Disk function
    • From: Daniel Lichtblau <danl@wolfram.com>
  • Re: Hole/Disk function
    • From: Murray Eisenberg <murray@math.umass.edu>