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d2jsp Forums > Off-Topic > General Chat > Homework Help > Why Does Sin(pi) Not Return 0 In Matlab?
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#1
Oct 25 2014 08:33pm
it returns 1.2246e-016.

Yes I know its approximately equal to 0 but why doesnt it output 0 then?
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#2
Oct 25 2014 08:37pm
type format short

1.2246e-016 is the computer's way of being precise, it's basically zero

This post was edited by JDota72 on Oct 25 2014 08:38pm
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#3
Oct 25 2014 08:38pm
because pi is approximated in matlab.

if you need an exact answer, use degrees.

>> cosd(90)

ans =

0

>> sind(-180)

ans =

0
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#4
Oct 25 2014 08:44pm
k thanks guys
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