[ncl-talk] Need help for plotting multiple regression lines in one plot

Thu Mar 3 09:41:24 MST 2016

```Hi Sun,
It looks to me like all three of the regression lines (shown on Global.pdf,
Global1.pdf and Global2.pdf) look quite similar if not the same, as they
all run from (0.0,0.001) to (0.3,0.0). Thus, the composite plot
(Global3.pdf) might be showing all 3 lines. Looking at your coding you have
these three lines that all use rc to construct the regression lines:
pltarry(1,:) = rc*(calextd-rc at xave) + rc at yintercept
pltarry1(1,:) = rc*(camMextd-rc at xave) + rc at yintercept
pltarry2(1,:) = rc*(camextd-rc at xave) + rc at yintercept

I think those lines should read like this:
pltarry(1,:) = rc*(calextd-rc at xave) + rc at yintercept
pltarry1(1,:) = rc1*(camMextd-rc1 at xave) + rc1 at yintercept
pltarry2(1,:) = rc2*(camextd-rc2 at xave) + rc2 at yintercept

If you have any further questions please let ncl-talk know.

On Wed, Mar 2, 2016 at 8:48 PM, mireiyue <mireiyue at gmail.com> wrote:

>
>
> On Mar 2, 2016, at 3:01 PM, Adam Phillips <asphilli at ucar.edu> wrote:
>
> Hi Sun,
> (Please always include the ncl-talk email list on any replies.) As you do
> have a frame(wks) call at the end of your script, can you set gsnDraw  and
> gsnFrame = True, and send the resulting 4 images to the ncl-talk email list
> so all can see?
> Thanks,
>
> On Wed, Mar 2, 2016 at 2:47 PM, mireiyue <mireiyue at gmail.com> wrote:
>
>> Dear NCL users
>>
>> I am trying to plot three different data with three regression lines in
>> one plot. I can plot all data in one plot but the regression line only plot
>> the first one.  How I can plot all three regression lines in one plot? I do
>> appreciate any helps!! Thank you!!
>>
>> Sun-
>>
>>  rc =  regline_stats(calextd,merracmf)
>>  print(rc)
>>  pltarry   = new((/2,dimsizes(calextd)/),typeof(calextd))
>>  pltarry(0,:) = merracmf                                ; use markers
>>  pltarry(1,:) = rc*(calextd-rc at xave) + rc at yintercept          ; use
>> solid line
>>  printVarSummary(pltarry)
>>
>>  rc1 = regline_stats(camMextd,camMcmf)
>>  print(rc1)
>>  pltarry1   = new((/2,dimsizes(camMextd)/),typeof(camMextd))
>>  pltarry1(0,:) = camMcmf                                ; use markers
>>  pltarry1(1,:) = rc*(camMextd-rc at xave) + rc at yintercept          ; use
>> solid line
>>  printVarSummary(pltarry1)
>>
>>  rc2 = regline_stats(camextd,camcmf)
>>  print(rc2)
>>  pltarry2   = new((/2,dimsizes(camextd)/),typeof(camextd))
>>  pltarry2(0,:) = camcmf                                ; use markers
>>  pltarry2(1,:) = rc*(camextd-rc at xave) + rc at yintercept          ; use
>> solid line
>>  printVarSummary(pltarry2)
>>
>> wks   = gsn_open_wks("eps","Global")
>> res                   = True                     ; plot mods desired
>> res at gsnDraw     = False      ; Will draw later, after overlaying
>> res at gsnFrame    = False      ; all plots
>> ; res at gsnMaximize       = False
>> res at trXMinF              = 0.
>> res at trYMinF              = 0.
>>
>> res at xyMarkLineModes   = (/“Markers”,”Lines”/) ; choose which have markers
>> res at xyExplicitLegendLabels = “A"
>> res at pmLegendParallelPosF   = 0.35
>> res at xyMarkers         = "16"                     ; choose type of marker
>> res at xyMarkerColor     = "darkgreen"              ; Marker color
>> res at xyMarkerSizeF       = 0.01                  ; Marker size (default
>> 0.01)
>> res at xyLineColor         = "black"
>> res at xyLineThicknesses   = 1 ;(/1,2/)
>> res at xyDashPatterns      = 0                      ; solid line
>> plot2  = gsn_csm_xy (wks,calextd,pltarry(0:1,:),res)
>>
>> res at xyMarkers         = "7"                     ; choose type of marker
>> res at xyMarkerColor     = "blue"              ; Marker color
>> res at xyMarkerSizeF       = 0.01                  ; Marker size (default
>> 0.01)
>> res at xyExplicitLegendLabels = “B"
>> res at pmLegendParallelPosF   = 0.79
>> res at xyLineColor         = "red"
>> res at xyLineThicknesses   = 1 ;(/1,2/)
>> res at xyDashPatterns      = 0                      ; solid line
>> plot1  = gsn_csm_xy (wks,camMextd,pltarry1(0:1,:),res)
>>
>> res at xyExplicitLegendLabels = “C"
>> res at pmLegendParallelPosF   = 1.2
>> res at xyMarkers         = "12"                     ; choose type of marker
>> res at xyMarkerColor     = "red"              ; Marker color
>> res at xyMarkerSizeF       = 0.01                  ; Marker size (default
>> 0.01)
>> res at xyLineColor         = "blue"
>> res at xyLineThicknesses   = 1 ;(/1,2/)
>> res at xyDashPatterns      = 0                      ; solid line
>> plot =gsn_csm_xy (wks,camextd,pltarry2(0:1,:),res)
>>
>> overlay(plot,plot1)
>> overlay(plot,plot2)
>> draw(plot)            ; This will draw all four plots
>>
>>
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>
>
> --
> Associate Scientist,  Climate and Global Dynamics Laboratory, NCAR
> www.cgd.ucar.edu/staff/asphilli/   303-497-1726
>
>
>
>

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