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Overview
| Comment: | Make use of atan2 unsigned Hadn't realised it returns negative numbers. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | trunk | origin/master |
| Files: | files | file ages | folders |
| SHA3-256: |
0fe524de4840b75cca8929098258e776 |
| User & Date: | base@atomicules.co.uk 2014-11-28 21:29:30 |
Context
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2014-11-29
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| 17:42 | Merge branch 'master' into osrm Noticed the nth_wrap problem whilst developing this osrm branch as building the list of winds would be incomplete. check-in: 915a1fb3d0 user: base@atomicules.co.uk tags: trunk, origin/master | |
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2014-11-28
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| 21:29 | Make use of atan2 unsigned Hadn't realised it returns negative numbers. check-in: 0fe524de48 user: base@atomicules.co.uk tags: trunk, origin/master | |
| 21:03 | Do head | tail properly Wasn't thinking straight when I first wrote that, obviously check-in: 5c494abd30 user: base@atomicules.co.uk tags: trunk, origin/master | |
Changes
Changes to headsilose.erl.
155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 |
convert_lats_longs_to_distance_heading([_Head1 | [ _Head2 | Rest]]) ->
%All co-ords are diff, so just ignore first two
convert_lats_longs_to_distance_heading_(Rest, []).
convert_lats_longs_to_distance_heading_([Lat | [Lon | Rest]], List_distance_headings) ->
%Want to map through the list convert co-ords to distance and heading
Distance = math:sqrt(math:pow(Lat,2) + math:pow(Lon,2)),
Heading = math:atan2(Lon, Lat),
Compass_direction = get_compass_direction_for(Heading),
convert_lats_longs_to_distance_heading_(Rest, [{Distance, Compass_direction}]++List_distance_headings);
convert_lats_longs_to_distance_heading_([], List_distance_headings) ->
lists:reverse(List_distance_headings).
get_compass_direction_for(Heading) ->
|
| > > > > > > |
155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 |
convert_lats_longs_to_distance_heading([_Head1 | [ _Head2 | Rest]]) -> %All co-ords are diff, so just ignore first two convert_lats_longs_to_distance_heading_(Rest, []). convert_lats_longs_to_distance_heading_([Lat | [Lon | Rest]], List_distance_headings) -> %Want to map through the list convert co-ords to distance and heading Distance = math:sqrt(math:pow(Lat,2) + math:pow(Lon,2)), Heading_signed = math:atan2(Lon, Lat), %Need to convert heading into a 2π value Heading = if Heading_signed < 0 -> Heading_signed + 2*math:pi(); true -> Heading_signed end, Compass_direction = get_compass_direction_for(Heading), convert_lats_longs_to_distance_heading_(Rest, [{Distance, Compass_direction}]++List_distance_headings); convert_lats_longs_to_distance_heading_([], List_distance_headings) -> lists:reverse(List_distance_headings). get_compass_direction_for(Heading) -> |