interpolation from a curve in excel
interpolation from a curve in excel
(OP)
dear friends,
I have a curve, but i have not any formula or function,
how can i find a good fitting function and extract new data from this curve.
for example:
from a curve we can find that:
f(a1)=b1
f(a2)=b2
f(a3)=b3,...
then f(x)=?
Thank you,
I have a curve, but i have not any formula or function,
how can i find a good fitting function and extract new data from this curve.
for example:
from a curve we can find that:
f(a1)=b1
f(a2)=b2
f(a3)=b3,...
then f(x)=?
Thank you,





RE: interpolation from a curve in excel
RE: interpolation from a curve in excel
http://preview.tinyurl.com/2prpo4
From the website:
"Three Dimensional Interpolate and Extrapolate Functions; Two Dimensional Interpolate, Extrapolate, Cubic Spline, Polynomial Curve Fitting, Line Intersections, Minima, Maxima, First Derivative, Second Derivative, and other functions."
RE: interpolation from a curve in excel
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RE: interpolation from a curve in excel
Not almost anymore!
RE: interpolation from a curve in excel
corus
RE: interpolation from a curve in excel
You can also turn to other sources beside Excel for curve-fitting. For some online tools, check out:
http://www.zunzun.com/
http://www.savetman.com/curvefit/index.html
http://w
http://www.xuru.org/rt/TOC.asp
I have used zunzun.com to perform the same task. As stated previously, it helps to know the model that the data came from.
RE: interpolation from a curve in excel
http://sourceforge.net/project/showfiles.php?group_id=187105
If you would like to make your own curve and surface fitting web site, the tutorial for this is at
http://wiki.pylonshq.com/display/pylonscookbook/Pylons+Curve+and+Surface+Fitting+Tutorial
Please let me know if you have any questions or suggestions for the site.
James