This simple code note working, HELP

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Poojitha Ariyathilaka 2020-6-13

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https://ww2.mathworks.cn/matlabcentral/answers/547446-this-simple-code-note-working-help

评论： Poojitha Ariyathilaka 2020-6-13

%this works well upto t==0.7, but not after 0.8
%give me an answer for this, not links
t=0;
for n=1:10
    t=t+0.1;
    disp(t)
    if t==0.8
        disp('if')
    else
        disp('else')
    end
end

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采纳的回答

Ameer Hamza 2020-6-13

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https://ww2.mathworks.cn/matlabcentral/answers/547446-this-simple-code-note-working-help#answer_450480

编辑：Ameer Hamza 2020-6-13

在 MATLAB Online 中打开

Direct comparison using == of floating-point number does not give the correct result. You need to allow some level of tolerance. Try this

t=0;
for n=1:10
    t=t+0.1;
    disp(t);
    if abs(t-0.8) < 1e-6
        disp('if')
    else
        disp('else')
    end
end

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Ameer Hamza 2020-6-13

yes, that will work as well, but it is good to use the tolerance method. Otherwise, you will need to do rounding every time you do some mathematical operation on the variable.

Poojitha Ariyathilaka 2020-6-13