Vectorization of for loop
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I have this for loop with conditionals inside it.
for i=1:m
for j=1:n
if (flipped_im(i,j,1)>flipped_im(i,j,2)) || (flipped_im(i,j,1)>flipped_im(i,j,3))
mod_im(i,j,:)=255;
else
mod_im(i,j,:)=flipped_im(i,j,:);
end
end
end
How I can turn this loop into vectorized code?
2 个评论
Stephen23
2019-3-14
"How I can turn this loop into vectorized code?"
Why do you need to do that?
Yaser Alghawi
2019-3-14
采纳的回答
In three lines, no loop:
>> new_im = flipped_im;
>> idx = new_im(:,:,1)>new_im(:,:,2) | new_im(:,:,1)>new_im(:,:,3);
>> new_im(idx(:,:,[1,1,1])) = 255;
and checking:
>> isequal(mod_im,new_im)
ans = 1
For MATLAB versions R2016b and later you can simplify the index code:
idx = any(new_im(:,:,1)>new_im(:,:,2:3),3);
1 个评论
Jan
2019-3-14
Or in < R2016b:
idx = any(new_im(:,:, [1, 1]) > new_im(:,:, 2:3), 3);
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