math/

quat2rotaxis.pro

top source quat2rotaxis

Math

result = quat2rotaxis(quat)

Returns the net axis and angle of the rotation specified by the input quaternion.

Return value

The function returns a 4-element vector. The first 3 elements are the axis of the rotation and the 4th element is the magnitude of the rotation in radians.

Parameters

quat in: A quaternion specifying a rotation.

Examples

    IDL> theta=!PI/3.
    IDL> rm = [[COS(theta),0,-SIN(theta)],[0,1,0],[SIN(theta),0,COS(theta)]]
    IDL> quat = MATRIX2QUATERNION(rm)
    IDL> rotation = QUAT2ROTAXIS(quat)
    IDL> PRINT, rotation
          0.00000    -1.000000      0.00000     1.04720

Author information

History:: Written by: Jeremy Bailin 27 Nov 2008 Released in JBIU

File attributes

Modification date:	Wed Apr 15 16:08:04 2009
Lines:	44

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