-------- Original Message -------- Subject: Re: Software for standard Fourier analysis Date: Thu, 7 Aug 2008 00:26:31 -0700 (PDT) From: [EMAIL PROTECTED] To: [email protected] References: <[EMAIL PROTECTED]> Hi, I would recommend against the method. The first problem is finding a reasonable origin. The program searches for this iteratively, minimizing the first harmonic, but it is a mess and sometimes converges on something silly. Also, the constant-angle requirement means that the outline can become very unevenly sampled (also raising interpolation issues). All this makes FA a more complicated method to program than EFA! Finally, only the simplest shapes can be analyzed at all, because radius must be a single-valued function of angle. Actually, the main reason I include it in Past is pedagogical - to demonstrate its poor performance ... Oyvind Hammer Natural History Museum University of Oslo
-------- Original Message -------- Subject: Software for standard Fourier analysis Date: Wed, 6 Aug 2008 13:15:01 +1000 From: Paul Sanfilippo <[EMAIL PROTECTED]> To: [EMAIL PROTECTED] Dear Morphmet Community, I'm in the early stages of some data collection on outlines of optic discs. I've been primarily using elliptic Fourier analysis for this, but thought I should also do the analyses using standard Fourier methods. There's a plethora of software out there for EFA, but very little for standard FA (I see PAST does it). Are there any such bits of software still floating around out there? Thank you, Paul Sanfilippo PhD Student Uni Melbourne Australia -- Replies will be sent to the list. For more information visit http://www.morphometrics.org
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