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interpolation! [message #10737]

Wed, 21 January 1998 00:00

hwang
Messages: 5
Registered: January 1998

Junior Member

I want to use bilinear to interpolate.
I have the values of five points:
(x1,y1,t1),(x2,y2,t2),(x3,y3,t3),(x4,y4,t4),(x5,y5,t5).

Suppose t is the function of x and y:t=t(x,y).

Now I want to know the value of t at the given point(x,y).How can I
use bilinear routine to interpolate?

According to the manual,the bilinear need three arguments:
bilinear(p,ix,jy)
P is a 2 dimensional array.
Ix and jy are "virtual subscripts" of p.

If p is 2 dimension,how can I feed in the values of (x1,y1,z1)...?
What is the meaning of "virtual subscripts"?

There is another method.If I suppose the general form of bilinear
function:t=ax+by+cxy+d.I can get the coefficents(a,b,c,d) using some
routines,but?????

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