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Programming > IDL > curvefit functi...
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curvefit function, initial guess and point number

by "tony_lincoln@[EMAIL PROTECTED] " <tony_lincoln@[EMAIL PROTECTED] > Jun 21, 2006 at 10:06 PM

Dear colleagues,

I am using curvefit function to fit some data which increase
expoentially. I would like to fit the data using the function
a[0]*exp(a[1]*x) + a[2].
I have to give the original guess for a[0], a[1], a[2].
For some data which have 50 points, it can fit quite well, and it does
not depend on the original guess.
But for other data which have 25-27 points, it can not fit well and it
depends on the original guess!
So it seems that there are some relation****p between curvefit function,
initial guess and point number. If yes, what is the lowest limit for
the point number?
Which parameter is im****tant for the data fitting?
Thanks. 

Tony
 




 1 Posts in Topic:
curvefit function, initial guess and point number
"tony_lincoln@[EMAIL  2006-06-21 22:06:04 

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