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Re: evenly spaced vector [message #81311 is a reply to message #81182]

Fri, 07 September 2012 07:06

Craig Markwardt
Messages: 1869
Registered: November 1996

Senior Member

On Friday, September 7, 2012 3:17:58 AM UTC-4, sivan wrote:
> On Thursday, September 6, 2012 10:41:22 PM UTC+3, Craig Markwardt wrote:
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>
>> The points are equally spaced in path length, where path length between data values is defined by the pythagorean theorem. It's doing what you asked it to do. But the pythagorean theorem doesn't really make sense when X is tempoerature and Y is log_g, does it?
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>> If you want equidistantly sampled points in *plot* space, then you need to transform to device coordinates first, then do your arcsampling.
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>> Some warnings. ARCSAMPLE uses SPL_INTERP(), which has some overshoot for rapidly varying functions like yours. You may not want that. Also, you used David's original code which sets the endpoint slopes to AVGSLOPEX and AVGSLOPEY, but that assumes that it's still a closed curve. Yours is not a closed curve. For your open curves, you should revert to natural splines where the slope is not specified at the endpoints.
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> by the way, i visited your homepage and found out that you were a PhD student of Hakkı Ögelman. He was one of the most precious professors in my country, Turkey.

Thanks for your kind words.

> whatever, as you mentioned above, pythagorean theorem doesn't make sense.
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> do you have any idea how to do what i wanted?

Yes. I described it above. "If you want equidistant points in plot space..."

CM

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[Message index]

		evenly spaced vector By: sivan on Tue, 21 August 2012 11:21
		Re: evenly spaced vector By: Craig Markwardt on Sun, 02 September 2012 13:46
		Re: evenly spaced vector By: sivan on Thu, 06 September 2012 04:22
		Re: evenly spaced vector By: sivan on Sun, 02 September 2012 07:27
		Re: evenly spaced vector By: Craig Markwardt on Fri, 07 September 2012 07:06
		Re: evenly spaced vector By: sivan on Fri, 07 September 2012 12:40
		Re: evenly spaced vector By: sivan on Fri, 07 September 2012 00:17
		Re: evenly spaced vector By: Craig Markwardt on Thu, 06 September 2012 12:41
		Re: evenly spaced vector By: sivan on Thu, 06 September 2012 10:22
		Re: evenly spaced vector By: Craig Markwardt on Thu, 06 September 2012 07:00
		Re: evenly spaced vector By: Craig Markwardt on Fri, 07 September 2012 20:40
		Re: evenly spaced vector By: sivan on Wed, 19 September 2012 08:41
		Re: evenly spaced vector By: sivan on Sun, 02 September 2012 05:33

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