Re: Partial curve fitting
- From: "John D'Errico" <woodchips@xxxxxxxxxxxxxxxx>
- Date: Mon, 25 May 2009 03:32:01 +0000 (UTC)
"Gy?rgy Kov?cs" <wirth6@xxxxxxxxx> wrote in message <gvcl7u$p85$1@xxxxxxxxxxxxxxxxxx>...
Hi,
It might be a bit stupid question, but I've started to use curve fitting toolbox, and I wonder if there is a way to fit a specially formed curve to only a part of the data points, without knowing beforehand wich part to fit.
To make it a bit more clear, what I want to do:
I have a series of data points, say this graph:
[URL=http://img162.imagevenue.com/img.php?image=06948_example_122_869lo.jpg][IMG]http://img162.imagevenue.com/loc869/th_06948_example_122_869lo.jpg[/IMG][/URL]
Now I want to decompose this, to specific curves, in these forms:
[URL=http://img257.imagevenue.com/img.php?image=06953_effects_122_531lo.jpg][IMG]http://img257.imagevenue.com/loc531/th_06953_effects_122_531lo.jpg[/IMG][/URL]
But I don't want to specify the beginning and the end of the different curves, I want the program to find those automatically.
So I run curve fitting, and what I get is the following:
[URL=http://img109.imagevenue.com/img.php?image=07229_example_2_122_1191lo.jpg][IMG]http://img109.imagevenue.com/loc1191/th_07229_example_2_122_1191lo.jpg[/IMG][/URL]
And I get this, because it tries to fit the curve to the whole data set. But what I want is a function, that fits better on a part of it, where the function not equals 0.5 and I don't care how it fits, where the function is 0.5. I could easily do this, If I would just cut out that part, where I want to achieve a better fit. But then the decomposition would not be automatic.
I hope someone can help. Thanks for any advice.
There are many things in this world that you may want.
Perhaps you have one of those computers that you see
in the movies, where all you need to do is talk to it.
Something simple like this:
"sequence alien DNA"
The computer immediately responds
"processing"
And, of course, in about 30 seconds, the computer is
done with this simple task.
Oh. You don't have one of those new CPUs? The ones
with 16 zettabytes of RAM for memory, and 21 exaflops
of processing power for each of its 1048576 cores? I
think it runs Vista as an OS.
Yeah, I know, I still have to write code myself too.
John
.
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- From: Gy?rgy Kov?cs
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