MATLAB: Oh no! A(A==0)=NaN is turning the matrix into all zeros!!

0MATLABnan

Okay, I'm feeling like an idiot, what on earth could I be doing wrong?
>> whos KoppenDsb_airT
  Name                  Size                     Bytes  Class     Attributes
    KoppenDsb_airT      360x720x361            374284800  single       
>> min(min(KoppenDsb_airT))
ans(:,:,1) =
    -26.5479
ans(:,:,2) =
    -23.5349
ans(:,:,3) =
    -22.6819
ans(:,:,4) =
    -17.3890
ans(:,:,5) =
    -12.0117
ans(:,:,6) =
     -8.7705
ans(:,:,7) =
     -5.3165
ans(:,:,8) =
       0
ans(:,:,9) =
       0
etc…
KoppenDsb_airT(KoppenDsa_airT==0)= nan;     
>> min(min(KoppenDsb_airT))
ans(:,:,1) =
       0
ans(:,:,2) =
       0
ans(:,:,3) =
       0
ans(:,:,4) =
       0
ans(:,:,5) =
       0
ans(:,:,6) =
       0
ans(:,:,7) =
       0
ans(:,:,8) =
       0
ans(:,:,9) =
       0
etc…
Any idea what I'm doing wrong? Thanks!

Best Answer

I think you may be mixing up your variables
KoppenDsa_airT
and
KoppenDsb_airT
Still, the result is puzzling to me.
Is the array the same shape after that operation?
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