Why do I get an invalid dimensions error using TriScatteredInterp?

I'm using TriScatteredInterp for 3 dimensional interpolation.

I have 3 variables xd,yd,zd of size 151:3 and I want to interpolate the values of z of size 31:25 for the given input values of x and y size 31:25.

If i run this program:

xd1=xlsread('3dcr.xls',1);
xd2=xlsread('3dcr.xls',7);
xd3=xlsread('3dcr.xls',3);
xd=[xd1,xd2,xd3];
yd1=xlsread('3dcr.xls',5);
yd2=xlsread('3dcr.xls',9);
yd3=xlsread('3dcr.xls',6);
yd=[yd1,yd2,yd3];
zd1=xlsread('3dcr.xls',2);
zd2=xlsread('3dcr.xls',8);
zd3=xlsread('3dcr.xls',4);
zd=[zd1,zd2,zd3];
f=TriScatteredInterp(xd,yd,zd);
for i=1:31
    for j=1:25
        v(i,j)=20;
       b(i,j)=0.9;
    end
end

zz=f(v,b)

I get this error:

 ??? Error using ==> TriScatteredInterp
 Input data point locations have invalid dimension.
 Error in ==> Untitled at 13
 f=TriScatteredInterp(xd,yd,zd);

[Jiro Doke]

What are the sizes of xd, yd, zd? The documentation says they have to be column vectors of the same size.

[mythili]

thank u Jiro...its working with column vectors...

Answer 1

[Oleg Komarov]

As Jiro pointed out xd, yd, zd should be column vectors. Whereas you're doing:

xd=[xd1,xd2,xd3]; 
yd=[yd1,yd2,yd3]; 
zd=[zd1,zd2,zd3];

Try to use:

f=TriScatteredInterp(xd(:),yd(:),zd(:))

Then it's not clear what the loop after is for...

Oleg

[mythili]

thank u Oleg..

as u said, with column vectors its working...