Sub-setting a 1D array

If I have an array containing 1 month of hourly data (0:743) and another array of corresponding time-stamps, and try to plot the time series with the time-stamps as labels on the X-axis, they are too close together and I just get a big bunch of black.

How can I select a sub-set of the timestamps to print? Something like this:

  rain = wrf_user_getvar(a,"RAINNC",-1) / 25.4 ; 25.4 mm/inch
  Times = a->Times
  times = wrf_times_c(Times,3)

  n = dimsizes(rain)
  taus = ispan(0,n(0)-1,24) ; One label per day

  ts_res = True
  ts_res@tmXBMode = "Explicit" ; Define own tick mark labels.
  ts_res@tmXBValues = taus ; location of explicit labels
  ts_res@tmXBLabels = times(taus) ; labels are the locations

  ts_plot = gsn_csm_xy(wks,taus,rain,ts_res)

It boils down to "how do I select every Nth element of an array"? I can't find a discussion of such a basic concept in the examples...

Thanks,

Bart

Ignore Mordac:

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Received on Thu Oct 11 17:59:54 2012