Re: time label x axis has one hour shift to the left

Hi, Rick:

Thanks for pointing out the problem. You suggestion of ttmValues doesn¡¯t work. The time labels don¡¯t show up even. I add some dummy values at the beginning of the data to make the sharp hour and set the appropriate ttmMajorStride value. It looks fine right now. But I have to say it is potentially inconvenient in NCL to my knowledge.
 

From: Rick Brownrigg
Sent: Thursday, January 16, 2014 11:23 AM
To: Lijun Diao
Cc: ncl-talk
Subject: Re: time label x axis has one hour shift to the left

Hi,

I'm not totally convinced time_axis_labels is doing the right thing in this case. The first time in your data is 13:58:43. Although the docs for time_axis_labels shows an example of using format "%H:00", it looks like it takes that value of 13:58:43 and simply makes it "13:00", effectively truncating the time value. Indeed, if I use a format of "%H:%M", the plot's labels look correct for the data; unfortunately they are not at nice, top-of-the-hour, intervals. Check out the ttmValues resource in the docs for time_axis_labels for a way to force specific time-values used in the labels.

Hope that helps¡­
Rick

On Jan 15, 2014, at 6:53 PM, "Lijun Diao" <ljdiao@gmail.com> wrote:

  Hi, all:

  I am trying to plot an xy plot with time label x axis. The time data is UTC in secondes. I called ¡°time_axis_labels¡± precedure. However, it seems that the plot is one hour shifted to the left. My first non-missing data value begins at 14:01:37 and the last ends at 21:37:13. However, the graph shows the time series begins right after 13:00:00 and ends before 21:00:00 . Please see the attached script, data file and plot.

  thanks for any suggestions!

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  Lijun Diao
  ldiao@uh.edu
  Research Assistant
  Department of Earth & Atmospheric Sciences
  University of Houston
  4800 Calhoun RD., Bldg. S&R1-312
  Houston, TX 77204-5007
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Received on Thu Jan 16 12:03:43 2014