Curve fitting with no input give

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Urmila
Urmila 2011-3-18
Hi:
If no input is given how can curve fitting be done?
Urmila

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Matt Tearle
Matt Tearle 2011-3-18
Do you mean that you have data but no idea about the curve to fit? If so, there are nonparametric methods available, such as LOESS. This free webinar might be of interest.

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Matt Fig
Matt Fig 2011-3-18
Do you mean you want to fit a curve to no data? That sounds easy, for I would think that just any curve can fit no data with equal accuracy. Let's try to fit a line to no data and see what happens:
P = polyfit([],[],1)
P =
0 0
So, the curve of best fit is
y(x) = 0x + 0
which sounds as reasonable to me as any other fit I can imagine.
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Urmila
Urmila 2011-3-18
I have figured it out. Basically the matrix is generated from a system that produces it without any input data. That is the user does not give input data to the system so that the system produces a matrix.

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