How to replace/exlude certain values from data array/plot

Hey Folks,

I have the following problem: I have SAR-scenes with readings in dB. In some cases the scenes have an edge with values of -1.0E-30. When I plot the data I get a series of data points around 0, which distort the result (see attached picture). I tried to replace these values with the following code:

if true
  % SAR_20070116(SAR_20070116 == -1.0e-30)=nan;
end

Unfortunately, the values were not overwritten. Does anyone know how to solve this problem?

[MiguelMauricio]

Let's say you want to remove the data lower than 1e-30. What about?

newArray=oldArray(oldArray>1e-30)

and your horizontal value array becomes

   xNew=xOld(oldArray>1e-30)

Answer 1

[Roger Wohlwend]

The problem is that the values are probably not exactly 1.0E-30 but something like 0.9876E-30 or 1.0003E-30. That is why your code does not work. Try the following:

SAR(abs(SAR) < 1E-20) = NaN;

The threshold 1E-20 is chosen arbitrarily. You can choose a different value, if you like.