galpy.util.coords.spher_to_cyl_vec¶
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galpy.util.coords.
spher_to_cyl_vec
(vr, vT, vtheta, theta)[source]¶ NAME:
spher_to_cyl_vecPURPOSE:
transform vectors from spherical polar to cylindrical coordinates. vtheta is positive from pole towards equator, theta is 0 at poleINPUT:
vr - Galactocentric spherical radial velocity
vT - Galactocentric spherical azimuthal velocity
vtheta - Galactocentric spherical polar velocity
theta - Galactocentric spherical polar angle
OUTPUT:
vR,vT,vzHISTORY:
2020-07-01 - Written - James Lane (UofT)