Floating point error incrementing in while loop

Question

Garrick Bruening 2019-7-23

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/473081-floating-point-error-incrementing-in-while-loop

回答： dpb 2019-7-23

Noticed an odd issue while creating a while loop and incrementing the value in it.

Basically I'm iterating through time, and it seems at some points it will add an arbitrarly small number to the time increment. Simple work around is to just floor it to the nearest 0.005, but wondering if there's a specific reason this is happening.

Code below reproduces.

time = 0;
while time<100
    time = time + 0.01;
    if mod(time,.005)~=0
        fprintf('Time added: \n');
        mod(time,.005)
        break
    end
end