How to do 2D array interpolation

Hi, I have a 2d array of values of dimension 4x4, and I would like to do a bilinear interpolation upto a dimension of 1024x1024. I would be very grateful, if anyone helps me in this regard.

The 2d array is:

    A=[0.0169    0.5876    0.4689    1.0000;
       0.5989    0.6525    0.3475    0.3559;
       0.5706    0.6525    0.3814    0.3616;
         0       0.5537    0.4011    0.8644];

Thanking You!

Answer 1

[Matt J]

 x=linspace(1,4,1024); 
 F=griddedInterpolant(A); 

 result=F({x,x});

[Pranjal Pathak]

Thanks Matt for your reply, but this command did not run in my Matlab version R2008a showing an error as :Undefined function or variable 'griddedInterpolant'. Is there any command or way to do this?

Thanking You!

[Matt J]

 result = interp2(A,x(:),x);

[Ehiremen Ebewele]

Did this work?

[Walter Roberson]

griddedInterpolant() itself needs at least R2011b.

In particularly old versions of MATLAB it might be necessary to use meshgrid() to construct the arrays of query locations.

[X, Y] = meshgrid(x, x);
result = interp2(A, X, Y);

[Bruno Luong]

Yes. Quite obscure, it took me few seconds to figure it out Matt's compact code, but it works

x = linspace(1,4,1024); 
result = interp2(A,x(:),x)