How use if else statement for floating point number

2022 3 18
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更新时间：2022 3 18
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the total of white pixels are found as floating point number. I want to do something when the total white pixels exceed 4000, else do nothing.
But my code can't work. Can anyone help me?
BW2 is my binary image
numWhitePixels = sum(BW2(:));
fprintf('%f\n',numWhitePixels)
if numWhitePixels >= 4000
se90 = strel('line',3,90);
se0 = strel('line',3,0);
BWsdil = imdilate(BW2,[se90 se0]);
BW3 = imfill(BWsdil, 'holes');
figure
imshow(BW3)
impixelinfo;
else
figure
imshow(BW2);
end

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Walter Roberson
Walter Roberson 2022-3-18
What value is getting printed out by the fprintf when you run the code?
Quah Yi Hang
Quah Yi Hang 2022-3-18
编辑：Quah Yi Hang 2022-3-18
ops, is my mistake, i set wrong number in the if statement
sorry about that.
thank for remind me

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