comp.lang.idl-pvwave archive: archive

Home » Public Forums » archive » polar interpolation

Show: Today's Messages :: Show Polls :: Message Navigator
E-mail to friend

Re: polar interpolation [message #33622 is a reply to message #33528]

Mon, 13 January 2003 17:36

Thomas Gutzler
Messages: 44
Registered: November 2002

Member

Hi,

Rick Towler wrote:
> "Thomas Gutzler" <tgutzler@ee.uwa.edu.au> wrote
>>
>> I want an interpolated curve in polar coordinates AND equidistant
>> theta-values. Since the original curve isn't a straight line it's really
>> complicated to pass the correct x-values to interpol so that
>> reconversion of the interpolated curve would have eqidistant
>> theta-values (of type integer).
>
> I might be missing something here (I usually am) but why won't simple linear
> interpolation work?

Hm, because I want it to be a spline or sth.

> If it is difficult to get one of the canned routines to
> work, brew your own:
>
> Interpolate between points a and b:
> iFactor = (Ti - Ta) / (Tb - Ta)
> Ri = Ra + (iFactor * (Rb - Ra))
> Where Ti is the Theta value where you are interpolating your radius Ri.

Thanx for this, but..
what I'm trying to do is to create the fitting function using spline and
solve this for the desired theta-values.
If I can't get this to work I will perhaps use your linear one.

Tom

Report message to a moderator

[Message index]

		polar interpolation By: Thomas Gutzler on Thu, 09 January 2003 19:20
		Re: polar interpolation By: Thomas Gutzler on Mon, 13 January 2003 17:36
		Re: polar interpolation By: Rick Towler on Mon, 13 January 2003 10:39
		Re: polar interpolation By: Thomas Gutzler on Sun, 19 January 2003 19:33
		Re: polar interpolation By: James Kuyper on Mon, 13 January 2003 09:40
		Re: polar interpolation By: Thomas Gutzler on Sun, 12 January 2003 22:43

Previous Topic:	Re: bandpass filter
Next Topic:	Re: keyboard problem

-=] Back to Top [=-

[ Syndicate this forum (XML) ] [

] [

]

Current Time: Sun Oct 12 07:36:35 PDT 2025

Total time taken to generate the page: 1.98548 seconds