interp3
in [Matlab]
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From: simone on 4 May 2010 09:29 hi , i am new and sorry for my terrible english, i am italian. i have this problem : i use w=interp3(x,y,z,V,xi,yi,zi,'linear'), i wanted to find w in some specific ranges and no problem since here. Now i would like to find the polynomial / logaritmic "formula" that interpoles my datas ( in other words, i would like to find w=a1x1^n+a2x2^n-1 ...+b1y1^m+...c1y1^o..., or a logaritmic formula or something similar). I wanna this because i need a formula "no-dependent" from Matlab, i have to use this with other programs ! When i use interp1 i can plot the result, and in Tools/basic fitting I find the function that interpoles, but how can I do with interp3 ? when I plot, basic fitting is "obscured"... Thanks (and sorry for my english) Simone
From: Torsten Hennig on 4 May 2010 22:43
> hi , i am new and sorry for my terrible english, i am > italian. > i have this problem : > i use w=interp3(x,y,z,V,xi,yi,zi,'linear'), i wanted > to find w in some specific ranges and no problem > since here. Now i would like to find the polynomial / > logaritmic "formula" that interpoles my datas ( in > other words, i would like to find w=a1x1^n+a2x2^n-1 > ...+b1y1^m+...c1y1^o..., or a logaritmic formula or > something similar). > I wanna this because i need a formula "no-dependent" > from Matlab, i have to use this with other programs ! > > When i use interp1 i can plot the result, and in > Tools/basic fitting I find the function that > interpoles, but how can I do with interp3 ? when I > plot, basic fitting is "obscured"... > > Thanks (and sorry for my english) > Simone The formulas for trilinear interpolation are provided at http://en.wikipedia.org/wiki/Trilinear_interpolation Maybe it helps to program it on your own. Best wishes Torsten. |