utilities.elements_from_state_vector: fix nan values for f#49
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Adds a missing check for the case where the eccentricity vector is in the third or fourth quadrant, requiring arg_pe to be negated. Note that this causes an edge case where arg_pe should be 0° but it comes out as 360° because we are not using modulo, but rather adding 2*pi. I didn't want to fix that in this commit because all the calculations in from_state_vector behave the same way. Fixes RazerM#39.
When negating an angle, consistently use mod 2*pi instead of adding 2*pi. This causes 0 to remain as 0 instead of becoming 2*pi.
This was caused by missing check for the case where e ~= 0 when orbits are inclined, thus dividing by the eccentricity resulted in a divide-by-zero. Fixes RazerM#38.
…orbits. This was calculating both raan and f as nan, since i=180° was going into the inclined orbit code path, when it is actually non-inclined. When invoked via KeplerianElements.from_state_vector, the nan value would fail an assertion. This also adds an important case needed to get the correct value of arg_pe for retrograde non-inclined orbits: if i=180°, arg_pe needs to be inverted since the orbit itself is upside down. Added two regression test cases for this case. Fixes RazerM#18 and RazerM#25.
…tion. This abstracts the repeated code that finds the unsigned minimum angle between two vectors using acos to a standalone function.
This was caused by the argument to acos being slightly higher than 1.0 due to rounding errors, resulting in nan (when it should just be 0). Fixes RazerM#40.
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This was caused by the argument to acos being slightly higher than 1.0 due to rounding errors, resulting in nan (when it should just be 0).
Fixes #40.
This is intended to be based on top of PR #48.