[ncl-talk] Limiting X-axis for a line in the Spectrum analysis

[Adam Phillips]

As you are overlaying plot3 onto plot(0), NCL will use the X-axis range
used in plot(0) to display the overlaid plot.
I believe Rick is recommending that you set spec3 at spcx to _FillValue when
p3 > 40.
Adam

On Fri, Jun 28, 2019 at 1:32 PM S Br via ncl-talk <ncl-talk at ucar.edu> wrote:

> Hi Rick,
> To calculate spectrum we need full length of data which is about 500
> years. Which parameter do you ask me to _FillValue for years greater than
> 40?
>
> Thanks.
> SB
>
> On Fri, Jun 28, 2019 at 5:17 PM Rick Brownrigg <brownrig at ucar.edu> wrote:
>
>> I don't know for certain, but what about setting the data for the 3rd
>> line to _FillValue for years greater than 40?
>>
>> Rick
>> On Fri, Jun 28, 2019 at 10:02 AM S Br via ncl-talk <ncl-talk at ucar.edu>
>> wrote:
>>
>>> Hi All,
>>> I have generated the attached spectrum analysis with three series of
>>> data. I have used overlay to plot three lines for this figure. In this, the
>>> X-axis ranges from 0 to 100. However, I don't want to show one of the
>>> spectrum line (e.g. Var3) beyond year 40. The first two series should show
>>> the spectrum with the X-axis 0 to 100 year but third spectrum line should
>>> plot up to year 40 (not beyond that).
>>>
>>> I have tried by limiting the X-axis as shown below but doesn't work.
>>>
>>>  res = True                                      ; no plot mods desired
>>>    res at gsnDraw                =  False
>>>    res at gsnFrame               =  False
>>>    res at trYMinF              = 0                 ; manually set lower
>>> limit Y axis
>>>    res at trYMaxF              = 15             ; manually set upper limit
>>> Y axis
>>>    res at trXMinF              = 0                 ; manually set lower
>>> limit X axis
>>>    res at trXMaxF              = 100             ; manually set upper
>>>
>>>   res at xyLineColors        = (/"green4"/) ; Line colours (white-to
>>> invisible the markov line)
>>>    plot(0) = gsn_csm_xy(wks, p1, spec1 at spcx, res)
>>>    delete(res at gsnCenterString)    ; no center string for the following
>>> plot
>>>    delete(res at gsnLeftString)    ; no center string for the following
>>> plot
>>>    res at xyLineColors        = (/"red"/) ; Line colours (white-to
>>> invisible the markov line)
>>>    plot2 = gsn_csm_xy(wks, p2, spec2 at spcx, res)
>>>
>>>    delete(res at trXMinF)
>>>    delete(res at trXMaxF)
>>>    res at trXMinF              = 0                 ; manually set lower
>>> limit X axis
>>>    res at trXMaxF              = 40             ; manually set upper limit
>>> X axis
>>>    res at xyLineColors        = (/"blue"/) ; Line colours (white-to
>>> invisible the markov line)
>>>    plot3 = gsn_csm_xy(wks, p3, spec3 at spcx, res)
>>>
>>>    overlay(plot(0),plot2)
>>>    overlay(plot(0),plot3)
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>> Thank you.
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-- 
Adam Phillips
Associate Scientist,  Climate and Global Dynamics Laboratory, NCAR
www.cgd.ucar.edu/staff/asphilli/   303-497-1726

<http://www.cgd.ucar.edu/staff/asphilli>
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