I noticed a difference with round() at 15 decimal places, and I need to know why this is so.
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Yesterday, I noticed that
round(2.4999999999999999) %15 decimal places
ans =
3
But
round(2.499999999999999) %16 decimal places
ans =
2
This can be for any number, not just 2. Does anybody know what causes this?
1 Comment
Jan
on 16 Apr 2016
The first example has 16 digits and the 2nd one 15 digits, not the other way around.
Accepted Answer
Mara Gati
on 16 Apr 2016
1 Comment
John D'Errico
on 16 Apr 2016
It is not 15 decimal digits that matters, since doubles are not stored in decimal form. A double in MATLAB is actually stored in binary. So 52 binary bits represents something a little more accurate than 15 decimal digits.
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