* add trackers on non-parallel slopes - add calc_axis_tilt and calc_side_slope functions to tracking.py - add tests for trackers on slopes - add singleaxis tracker w/slope test data Signed-off-by: Mark Mikofski <bwana.marko@yahoo.com> * reverse sign for test * update test data for sat w/slope - match pvlib algorithms - despite disagreement * fix stickler issues - remove unused _get_solar_vector, oops! not part of this pr, was decreasing coverage * add side_slope argument to docstring * change max_angle to conform to convention - by convention this is always defined relative to the zero-point rotation not the system-plane * stickler fixes: L459 whitespace, L456 long-line * update test data for max_angle convention * update to numpy-1.12.0 * use horizontal distance between rows * use axes_dist = 1/GCR/cosd(side_slope) so axes_d * update GCR in tests * used more sig figs in GCR in tests so update test data * the test data agrees with old data within 1e-5 * update api docs for trackers on side slope * update what's new for v0.7.1 for trackers with side-slope * use DATA_DIR from conftest * remove os from test_tracking and old DATADIR path * use axis tilt instead of tracker zenith * and use axis azimuth instead of tracker azimuth * change calc tracker axis tilt to degrees * clarify side slope relative to horizontal * change args/retval to degrees * add check for relative rotation * remove radians from test * update side slope angle convention * also add reference to NREL tech report * add test with validation data set from NREL tech report * fix stickler space complaints, see if indent helps docstring code blocks * apply suggested comments: * move what's new enhancements from v0.7.1 to v0.8.0 * fix returns for calc_system_tracker_side_slope() * add Notes section to calc_tracker_axis_tilt() Signed-off-by: Mark Mikofski <bwana.marko@yahoo.com> * resolve conflict in what's new v0.8.0 * use implementation procedure outline in NREL tech report * fix pvlib#824 update tests * add units to side slope Co-authored-by: Cliff Hansen <cwhanse@sandia.gov> * add see alsos * fix docstring for calc_tracker_side_slope, rm rel_rot * improve side-slope docstring, define rh rotation convention * fix arg order in calc side slope * also fix order in sat out dictionary * test truetracking in slope-aware validation dataset * update SingleAxisTracker class with side-slope * add missing whitespace after comma in test_tracking.py * catch invalid warnings for arccos in singleaxis * update whats new v0.8.0 * with new side_slope arg in SingleAxisTracker class * add fix for low sun angle tracker rotation calculations (issue 824) * add links to pr 823 * ignore invalid warnings for nan > x and nan % x in tracking.py * close pvlib#1041 prune old comments * remove commented code, especially any code relating to use of arctan2 adopted in 1fb82cc * remove comments that should be sourced directly from refernces, and instead list reference and Eqs. numbers * tidy up, combine lines, etc * remove redundant "tracker" from new sat funcs * in api.rst * what's new v0.8.0 * tracking.py & test_tracking.py * code review suggestions to clarify docs/comments * side slope is line in system plane, perp. to tracker azimuth * clarify right handed rotation of side slope in example, also replace EG with "For example" * clarify comment defining the tracker coord-sys Co-authored-by: Cliff Hansen <cwhanse@sandia.gov> * revise slope-aware tracker terms for clarity: * use cross_axis_slope instead of side_slope * use calc_cross_axis_tilt() instead of calc_system_side_slope() * use slope azimuth & tilt instead of system az & ze * clarify cross-axis tilt is measured in the tracker reference frame * add cross-axis tilt to the SingleAxisTracker repr() * add see also to SingleAxisTracker * remove Lorenzo reference * improve docstrings * clarify cross-axis tilt by using consistent wording * use "tracker axes" when referring to tracker axes plane (or slope) instead of just "slope" * update SingleAxisTracker headline to refer user to singleaxis function * remove redundant wording in cross_axis_tilt arg, regarding tracker axes plane, and make it verbatim between SingleAxisTracker, singleaxis, and calc_cross_axis_tilt * improve links to module index in LocalizedSingleAxisTracker * Improve docstring for singleaxis to be explicit about right-handed coordinate system of tracker reference frame and right-handed rotation for tracker_theta * suggested changes to comments and do multiplication before division * change slope_tilt to be relative to horizontal rather than defined by normal, also use "tracker axes plane" * fix typos, py:class, not pv:class, in localized single-axis tracker Co-authored-by: Cliff Hansen <cwhanse@sandia.gov>

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