fitting spline on data and getting equation

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milad babaei
milad babaei 2011-7-13
评论： deb.P 2019-11-8
i have a table with 3 variables(B/H)= 1,2,3,4,5,6,7,8 and fi= 0,10,20,30 and h which is depend on (B/H) and fi that contains 32 values. for example for fi=0 and (B/H)=1 >>h=1 fi=0 and (B/H)=2 >>h=1.02 ...... fi=30 and (B/H)=8 >>h=14800
h:[ 1 1.02 1.11 1.21 1.3 1.4 1.59 1.78
1 1.11 1.35 1.62 1.95 2.33 3.34 4.77
1.01 1.39 2.12 3.29 5.17 8.29 22 61
1.13 2.5 6.36 17.5 50 150 1400 14800]
>>>>is there any way in MATLAB to fit spline on data and get equation for h in terms of (B/H) and fi??and how could we make sure that spline is a good fit for our data???
  2 个评论
Andrei Bobrov
Andrei Bobrov 2011-7-13
Hi milad!
it does not suit?
<http://www.mathworks.com/matlabcentral/answers/10582-deriving-surface-equation-form-data-on-a-table>
milad babaei
milad babaei 2011-7-13
Hi dear,
would you please answer my 2 comment below that previous code that u mentiond above?i have question about other h values on table and then about how u consider h values???on the other hand because of large range of h values from 1 to 14800 i coouldnt find any 2dweighted polynomial to fit well.so i am looking for a spline to fit well on h vales.would you please help me more to solve this problem anyway??

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回答（1 个）

Bjorn Gustavsson
Bjorn Gustavsson 2011-7-13
If you have the spline toolbox you should take a look at spas2, spaps and csasp.
HTH,
  4 个评论
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milad babaei
milad babaei 2011-7-21
tnx for your help, i plotted my data with mesh command and then try to 2d interpolate with inter2(linear method gives me better answer than spline somehow) and get pretty answer on interpolation.now i would like to know is there any way to find that equation which fitted my data and and also evaluate the interpolated data???
deb.P
deb.P 2019-11-8
i have the same question, that i have fitted a curve to my 3 variable data set. Now i want to know what is the equation of the fitted curve.

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