How to value value NaN in a 2d matrix?

I have a 2d matrix with some NaN. how to value them? I give some figure to be more understandable:

It can be seen that there 2-3 values equal to NaN. I was wondering how to interpolate them with the rest values.Thanks in advance.

Answer 1

[Andrei Bobrov]

please use scatteredInterpolant, example:

a = randi([6 10],30,20);
a(randperm(numel(a),20)) = nan; % a - your 2d array with nan's

[r,c] = ndgrid(1:size(a,1),1:size(a,2));
l0 = ~isnan(a);
F = scatteredInterpolant(r(l0),c(l0),a(l0))
surf(a)
a2 = F(r,c);
figure,surf(a2)

Answer 2

[dpb]

http://www.mathworks.com/matlabcentral/fileexchange/4551-inpaint-nans