Add more nan values

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Mr X
Mr X 2013-3-19
I have a matrix which may contains a region of nan values. I would like to surround the nan region with 0 boundary.
An example
A = 5 5 5 5; 5 5 nan 5; 5 5 5 5;
would become 5 0 0 0 ; 5 0 nan 0; 5 0 0 0;
Any help is appreciated
  1 个评论
Jan
Jan 2013-3-19
What should happen for two neighboring NaNs?

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回答（1 个）

Youssef Khmou
Youssef Khmou 2013-3-19
编辑：Youssef Khmou 2013-3-19
hi try this standard version :
% Given
A = [5 5 5 5; 5 NaN 5 5; 5 5 5 5];
[N]=size(A);
for x=2:N(1)-1
for y=2:N(1)-1
if isnan(A(x,y))
%A(x-1:x+1,y-1:y+1)=0; not operational solution
A(x-1:x+1,y-1)=0;
A(x-1:x+1,y+1)=0;
A(x-1,y)=0;
A(x+1,y)=0;
end
end
end
A

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