Calculates Tait-Bryan z-y'-x" active rotation matrix given rotation angles alpha
,beta
,gamma
in radians
alpha: rotation angle about z [radians]
beta: rotation angle about y' [radians]
gamma: rotation angle about x" [radians]
Rotation Matrix prefida
IDL> rot_mat = tb_zyx(!DPI/2, 0.0, !DPI/3)
FUNCTION tb_zyx, a, b, g ;+#tb_zyx ;+Calculates Tait-Bryan z-y'-x" active rotation matrix given rotation angles `alpha`,`beta`,`gamma` in radians ;+##Arguments ;+ **alpha**: rotation angle about z [radians] ;+ ;+ **beta**: rotation angle about y' [radians] ;+ ;+ **gamma**: rotation angle about x" [radians] ;+ ;+##Return Value ;+ Rotation Matrix [prefida](|url|/sourcefile/prefida.pro.html) ;+ ;+##Example Usage ;+```idl ;+ IDL> rot_mat = tb_zyx(!DPI/2, 0.0, !DPI/3) ;+``` sa = sin(a) & ca = cos(a) sb = sin(b) & cb = cos(b) sg = sin(g) & cg = cos(g) R = dblarr(3,3) R[0,0] = ca*cb & R[1,0] = ca*sb*sg - cg*sa & R[2,0] = sa*sg + ca*cg*sb R[0,1] = cb*sa & R[1,1] = ca*cg + sa*sb*sg & R[2,1] = cg*sa*sb - ca*sg R[0,2] = -sb & R[1,2] = cb*sg & R[2,2] = cb*cg return, R END