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Re: IDLgrModel, rotation angles [message #38123 is a reply to message #38121]

Mon, 23 February 2004 10:27

James Kuyper
Messages: 425
Registered: March 2000

Senior Member

lyubo wrote:
>
> Hello,
>
> I have a transformation matrix and I must find the amount of rotation
> in degrees. How can I do that? Any help would be appreciated.
>
> Thank you,
>
> Lyubo

The eigenvalues of a pure rotation matrix are

EXP(COMPLEX(0,-theta))
1.0
EXP(COMPLEX(0,theta))

where theta is the rotation angle in radians. Therefore,

!RADEG*MAX(IMAGINARY(ALOG(HQR(ELMHESS(rot)))))

Will give you back the rotation angle of rot in degrees.

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[Message index]

		Re: IDLgrModel, rotation angles By: Rick Towler on Mon, 23 February 2004 11:36
		Re: IDLgrModel, rotation angles By: James Kuyper on Mon, 23 February 2004 11:49
		Re: IDLgrModel, rotation angles By: James Kuyper on Mon, 23 February 2004 10:27

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