condition for including difference between nan

Hi Guys, I had the following line for a condition I needed.

if (abs((tempBeforeDelam(i,j,1)-tempBeforeDelam(i,j,2)))< 1 ...
 && abs((tempBeforeDelam(i,j,2)-tempBeforeDelam(i,j,3))) < 1 ...
 && abs((tempBeforeDelam(i,j,3)-tempBeforeDelam(i,j,4))) < 1 ...
 && abs((tempBeforeDelam(i,j,4)-tempBeforeDelam(i,j,5))) < 1 ...
 && abs((tempBeforeDelam(i,j,5)-tempBeforeDelam(i,j,1))) < 1)

and replaced it with

 if all( abs( diff([ squeeze(tempBeforeDelam(i,j,:)); tempBeforeDelam(i,j,1) ]) ) < 1)

now I also need to incorporate a condition that says that even if the difference is nan proceed to the next step.

Any help would be appreciated.

Thanks

Answer 1

[Guillaume]

somediff = diff([squeeze(tempBeforeDelam(i,j,:)); tempBeforeDelam(i,j,1)]);
if all(abs(somediff) < 1 | isnan(somediff))
  %do it
end

The only way of returning true in a comparision expression that contains NaN is to explicitly test it with isnan. NaN is never smaller than, greater than or equal to any number (or another NaN).