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From: James Tursa on 9 Mar 2010 03:36
"Zachary " <zpardos(a)so.npam.yahoo.com> wrote in message <hn50h8$1jp$1(a)fred.mathworks.com>...
> "James Tursa" <aclassyguy_with_a_k_not_a_c(a)hotmail.com> wrote in message <hn500b$qg8$1(a)fred.mathworks.com>...
> >
> > >> num2strexact(0.1733)
> > ans =
> > 0.1733000000000000095923269327613525092601776123046875
> > >> num2strexact(0.0067)
> > ans =
> > 6.700000000000000226207941267375645111314952373504638671875e-3
> > >> num2strexact(0.1733+0.0067)
> > ans =
> > 0.1800000000000000210942374678779742680490016937255859375
> > >> num2strexact(0.1800)
> > ans =
> > 0.179999999999999993338661852249060757458209991455078125
> >
> > Using this utility:
> >
> > http://www.mathworks.com/matlabcentral/fileexchange/22239-num2strexact-exact-version-of-num2str
> >
> > James Tursa
>
> Thanks James

Also note that the two values differ only in the last bit:

>> format hex
>> 0.1733+0.0067
ans =
3fc70a3d70a3d70b
>> 0.1800
ans =
3fc70a3d70a3d70a

James Tursa
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