0 个投票

Hi! I have a raster file in tiff format which has some values set to -9999. I wrote a small code that should replace all -9999 values with NaN. Whren I execute the code the loop just keeps on going and it wont stop and generate the result. Can you please hel me figure out why? I am not attaching the raster because it is to big.
%reading Raster Input data from a file
[aspect, A] =readgeoraster('Aspect_0,5m.tif');
[slope, A] = readgeoraster('Slope_0,5m.tif')
imagesc(aspect)
%reading csv Input data from a file
discontinuity_orientations =readtable('orientations.xlsx') ;
for i =1:size(aspect,1)
if aspect (i,1)==-9999
aspect (i,1) = NaN
end
end

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 采纳的回答

David Hill
David Hill 2022-12-1

0 个投票

Instead of a for-loop, just do it all at once.
idx=aspect(:,1)==-9999;
aspect(idx,1)=nan;

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Hrvoje Lukacic
Hrvoje Lukacic 2022-12-1
Thank you for your answer !! But just in case, how to I make a for loop which goes from element to element and does some operation?

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更多回答（1 个）

VBBV
VBBV 2022-12-1
编辑：VBBV 2022-12-1

0 个投票

if ismember(-9999,aspect(i,1))
Check using ismember

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