How to do 2D array interpolation

17 views (last 30 days)
Pranjal Pathak
Pranjal Pathak on 26 May 2013
Edited: Bruno Luong on 13 Sep 2019
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!

Answers (1)

Matt J
Matt J on 26 May 2013
x=linspace(1,4,1024);
F=griddedInterpolant(A);
result=F({x,x});
  5 Comments
Walter Roberson
Walter Roberson on 13 Sep 2019
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
Bruno Luong on 13 Sep 2019
Edited: Bruno Luong on 13 Sep 2019
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)

Sign in to comment.

Categories

Find more on Creating and Concatenating Matrices in Help Center and File Exchange

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!