Home Manual Packages Global Index Keywords Quick Reference | # all functions - k
kepler |
                 xyz = kepler(orbit, time)
              or xyz = kepler(orbit, time, ma, ta, norb)

         return 3-dimsof(orbit(1,..))-by-dimsof(time) XYZ coordinates
         corresponding to the orbit(s) ORBIT and time(s) TIME.  Optionally
         return mean anomaly MA, true anomaly TA, and integer number of
         orbits, each a dimsof(orbit(1,..))-by-dimsof(time) array.  The
         MA and TA are in radians.  The x-axis is along the line of the
         vernal equinox, the z-axis is ecliptic north.
         ORBIT has leading dimension 12: [angle from perihelion, mean daily
         motion, semi-major axis, d/dt(semi-major axis), eccentricity,
         d/dt(eccentricity), longitude of ascending node, d/dt(ascending
         node), angle from ascending node to perihelion, d/dt(perihelion),
         inclination, d/dt(inclination)]
         (Six pairs of a quantity and its time derivative.)
         The angles are in degrees; d/dt units must match TIME units.
         Mean anomaly is not an angle in real space; it is the quantity
         proportional to time in Kepler's equation.  True anomaly is the
         angle from perihelion to planet.
         With a non-nil, non-zero full= keyword, return XYZUVW -- that is,
         six coordinates including velocities as well as positions.

    interpreted function, defined at i/kepler.i   line 6
SEE ALSO: | sch_planets, jpl_planets, sch_moon, moon, solar_system
kepler2 |
                 xyz = kepler2(orbit, xyz0)
              or xyz = kepler2(orbit, xyz0, time, ma, ta)

         return dimsof(xyz0) XYZ coordinates corresponding to the orbit(s)
         ORBIT and direction(s) XYZ0.  The dimensions of ORBIT beyond the
         first, if any, must match those of XYZ0, although XYZ0 may have
         any number of trailing dimensions.
         Optionally return TIME, mean anomaly MA, and true anomaly TA,
         each a dimsof(orbit(1,..))-by-dimsof(time) array.  The MA and TA
         are in radians.  The x-axis is along the line of the vernal
         equinox, the z-axis is ecliptic north.  The XYZ0 direction is first
         projected into the plane of the orbit; then XYZ will be proportional
         to XYZ0.  The time derivatives of the ORBIT elements are ignored.
         ORBIT has leading dimension 12: [angle from perihelion, mean daily
         motion, semi-major axis, d/dt(semi-major axis), eccentricity,
         d/dt(eccentricity), longitude of ascending node, d/dt(ascending
         node), angle from ascending node to perihelion, d/dt(perihelion),
         inclination, d/dt(inclination)]
         (Six pairs of a quantity and its time derivative.)
         The angles are in degrees; d/dt units must match TIME units.
         Mean anomaly is not an angle in real space; it is the quantity
         proportional to time in Kepler's equation.  True anomaly is the
         angle from perihelion to planet.

    interpreted function, defined at i/kepler.i   line 89
SEE ALSO: | sch_planets, jpl_planets, sch_moon, moon, solar_system
keybd_focus |
                 keybd_focus, on_off

         By default, graphics windows set a window manager hint which
         allows them to accept keyboard focus.  With ON_OFF zero, that
         hint will not be set when a new graphics window is created.
         This causes the window manager to refuse to offer keyboard
         focus to the graphics window -- very desirable, since it can't
         accept keyboard input anyway.  With fvwm, for example, this
         means keyboard focus can stay in the terminal window even when
         you are mouse zooming the graphics window.  However, many
         window managers confuse colormap focus with keyboard focus, so
         if you set the private=1 colormap in the window function, you
         may not be able to convince the window manager to give the
         graphics window colormap focus since it won't give it keyboard
         focus.  Weird.

    builtin function, documented at i0/graph.i   line 1393