Hi i try make contsruction 
 that  get   wind direction for last 7 days

 set code 
$span($day_delta=7).wind.vecdir 

and recive error

Feb  7 12:41:37 meteo weewx[19558]: cheetahgenerator: **** Ignoring template 
/etc/weewx/skins/Bootstrap/week.html.tmpl
Feb  7 12:41:37 meteo weewx[19558]: cheetahgenerator: **** Reason: Invalid 
aggregation type 'vecdir'
Feb  7 12:41:37 meteo weewx[19558]: ****  Traceback (most recent call last):
Feb  7 12:41:37 meteo weewx[19558]: ****    File 
"/usr/share/weewx/weewx/cheetahgenerator.py", line 315, in generate
Feb  7 12:41:37 meteo weewx[19558]: ****      print >> _file, text
Feb  7 12:41:37 meteo weewx[19558]: ****    File 
"/usr/local/lib/python2.7/dist-packages/Cheetah-2.4.4-py2.7-linux-i686.egg/Cheetah/Template.py"
, line 1005, in __str__
Feb  7 12:41:37 meteo weewx[19558]: ****      rc = getattr(self, 
mainMethName)()
Feb  7 12:41:37 meteo weewx[19558]: ****    File 
"_etc_weewx_skins_Bootstrap_week_html_tmpl.py", line 302, in respond
Feb  7 12:41:37 meteo weewx[19558]: ****    File 
"/usr/share/weewx/weewx/tags.py", line 323, in __getattr__
Feb  7 12:41:37 meteo weewx[19558]: ****      return self._do_query(
aggregate_type)
Feb  7 12:41:37 meteo weewx[19558]: ****    File 
"/usr/share/weewx/weewx/tags.py", line 337, in _do_query
Feb  7 12:41:37 meteo weewx[19558]: ****      val=val, **self.option_dict)
Feb  7 12:41:37 meteo weewx[19558]: ****    File 
"/usr/share/weewx/weewx/wxmanager.py", line 60, in getAggregate
Feb  7 12:41:37 meteo weewx[19558]: ****      return weewx.manager.
DaySummaryManager.getAggregate(self, timespan, obs_type, aggregateType, **
option_dict)
Feb  7 12:41:37 meteo weewx[19558]: ****    File 
"/usr/share/weewx/weewx/manager.py", line 1204, in getAggregate
Feb  7 12:41:37 meteo weewx[19558]: ****      **option_dict)
Feb  7 12:41:37 meteo weewx[19558]: ****    File 
"/usr/share/weewx/weewx/manager.py", line 433, in getAggregate
Feb  7 12:41:37 meteo weewx[19558]: ****      raise weewx.
ViolatedPrecondition("Invalid aggregation type '%s'" % aggregate_type)
Feb  7 12:41:37 meteo weewx[19558]: ****  ViolatedPrecondition: Invalid 
aggregation type 'vecdir'


when i set $week.wind.vecdir  it  works fine but  calculate from   week 
begin


pls help calculate  wind direction for the  last week

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