2d interpolation and finding equation to fit on data

Hi,
i am trying to find an equation to fit on my data.i have used 2d interpolation with linear method(inter2 command).now i would like to know is there any way to get an equation which is fitted by interpoalet data?and also evalute interpolant.this is my meshed data :
clear
clc;
BHv= [1:1:8];
phiv= [0:10:30];
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];

mesh(BHv,phiv,h)

xlabel('x-axis,(B/H)')

ylabel('y-axis,phi')

zlabel('depth factor,hc')

title('depth factor(hc) measurements,mandel & salencon 1969')

or if i want to use 2D spline interpolation,what should i do to get that equation which fit on data???

Answer 1

[Walter Roberson]

The answer doesn't change just because you ask the question again. See http://www.mathworks.com/matlabcentral/answers/10582-deriving-surface-equation-form-data-on-a-table

[milad babaei]

i didnt get my answer yet,,,,