sin cos problem. How to solve it

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tabw
tabw 2014-8-29
编辑： tabw 2014-8-29
why sind(45)=-0.707
it should be 0.707
and sind(18)=-0.9511
it should be 0.309
what's wrong with it

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Iain
Iain 2014-8-29
Theres 2 things that could be wrong.
1. User error - You're actually putting in something like: (-90 + 18) and (-90 + 45), instead of 18 and 45. - This is what I expect
2. A bad prank - Someone has written a function called sind that doesn't do what you think it should, and you're actually using that function.
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Iain
Iain 2014-8-29
If the result of:
which sind
says built-in, then you're using the built in version. If it says ....\sind.m, then the file can have been altered (which would be a bad prank)
tabw
tabw 2014-8-29
编辑：tabw 2014-8-29
type sind
'sind' is a built-in function.
so strange..
After I restart matlab, It functions in a normal way. Thanks all of you

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