If statement not executing

2012 3 4
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I'm running into a really weird problem . In my Matlab code, the statement if (time == 0.0992) does not execute, but when I write it in the form if (time== 0.0016*62), it does execute.
Now, since 0.0016*62 is equal to 0.0992, I don't see why the first statement is any different from the second.
NOTE : 'time' is a variable who's value is used as a operating condition for the if statement

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Wayne King
Wayne King 2012-3-4

1 个投票

Hi, They aren't really equal:
a = 0.0016*62;
b = 0.0992;
isequal(a,b)
This is a well known problem discussed in this forum frequently with the representation of floating-point numbers.
You should use some tolerance statement like
time = 0.0016*62;
if(abs(time-0.0992)< eps)
disp('True');
else
disp('False');
end
Or something similar, trying to insist on equality with floating-point numbers is going to cause you a lot of problems.

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