How to replace/exlude certain values from data array/plot
조회 수: 2 (최근 30일)
이전 댓글 표시
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?
댓글 수: 1
MiguelMauricio
2014년 5월 26일
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)
답변 (1개)
Roger Wohlwend
2014년 5월 26일
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.
댓글 수: 0
참고 항목
카테고리
Help Center 및 File Exchange에서 Data Type Conversion에 대해 자세히 알아보기
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!