[ncl-talk] xy-plot marker color + style

[Kreienkamp Frank]

Hello,

what i have found is an answer from Mary Haley back in the year 2010:

https://www.ncl.ucar.edu/Support/talk_archives/2010/0956.html

' ... The xyMarkerColors resource only works if you have multiple curves.
 It's not a way to take points in a single curve and color them
 differently. ...'

Taking this into account and adding some suggestions from Denis Shea the source code looks like:


; ***********************************************
; xy_4.ncl
;
; Concepts illustrated:
;   - Drawing a scatter plot
;   - Changing the markers in an XY plot
;   - Changing the marker color in an XY plot
;   - Changing the marker size in an XY plot
;   - Creating your own markers for an XY plot
;
; ***********************************************
;
; These files are loaded by default in NCL V6.2.0 and newer
; load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_code.ncl"
; load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_csm.ncl"
;************************************************
;                   MAIN
;************************************************
begin
nln = 2
nmk = 5

data                           = new((/nln,nmk/),float, -999.0)
data(:,0)                      = (/      4.80,     -4.26 /)
data(:,1)                      = (/      4.97,     14.63 /)
data(:,2)                      = (/      4.55,    -22.12 /)
data(:,3)                      = (/      4.47,     -4.51 /)
data(:,4)                      = (/      3.11,     19.09 /)

colors = (/"white","black","blue","green" ,"cyan", "darkorange","chocolate4" /)
Marker = (/16,14,11,7,3 /)

x = new((/nmk,3/),float)
y = new((/nmk,3/),float)
do j = 0 , nmk - 1
  x(j,:) = data (0,j)
  y(j,:) = data (1,j)
end do
print(colors(2:)+"   "+Marker)
;************************************************
; plotting parameters
;************************************************

wks   = gsn_open_wks ("x11","xy-test")                ; send graphics to PNG file
gsn_define_colormap(wks,colors)
res                   = True                     ; plot mods desired
res at tiMainString      = "Scatter Plot"           ; add title
res at xyMarkLineModes   = "Markers"                ; choose which have markers
res at xyMarkers         =  Marker                  ; choose type of marker
res at xyMarkerColors    = colors(2:)               ; Marker color
res at xyMarkerSizeF     = 0.01                     ; Marker size (default 0.01)
;res at tmLabelAutoStride = True                     ; nice tick mark labels
plot  = gsn_csm_xy (wks,x,y,res) ; create plot
end


Unfortunately only one dot is plotted. So still I do something wrong.

Could you please help.

Frank


Von: ncl-talk [mailto:ncl-talk-bounces at ucar.edu] Im Auftrag von Kreienkamp Frank
Gesendet: Donnerstag, 23. November 2017 15:19
An: ncl-talk at ucar.edu<mailto:ncl-talk at ucar.edu>
Betreff: [ncl-talk] xy-plot marker color + style

Hallo,

i am trying to plot a xy-plot. With each marker having a different color and marker style:

; ***********************************************
; xy_4.ncl
;
; Concepts illustrated:
;   - Drawing a scatter plot
;   - Changing the markers in an XY plot
;   - Changing the marker color in an XY plot
;   - Changing the marker size in an XY plot
;   - Creating your own markers for an XY plot
;
; ***********************************************
;
; These files are loaded by default in NCL V6.2.0 and newer
; load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_code.ncl"
; load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_csm.ncl"
;************************************************
begin
;************************************************
data                           = new((/2,5/),float)
data at _FillValue                = -999.
data(:,0)                      = (/      4.80,     -4.26 /)
data(:,1)                      = (/      4.97,     14.63 /)
data(:,2)                      = (/      4.55,    -22.12 /)
data(:,3)                      = (/      4.47,     -4.51 /)
data(:,4)                      = (/      3.11,     19.09 /)

colors = (/"white","black","blue","green" ,"cyan", "darkorange","chocolate4" /)
Marker = new(5,integer)
Marker = (/16,14,11,7,3 /)
print(colors)
print(Marker)
;************************************************
; plotting parameters
;************************************************
wks   = gsn_open_wks ("png","xy-test")                ; send graphics to PNG file
gsn_define_colormap(wks,colors)
res                   = True                     ; plot mods desired
res at tiMainString      = "Scatter Plot"           ; add title
res at xyMarkLineModes   = "Markers"                ; choose which have markers
res at xyMarkers         =  Marker                      ; choose type of marker
 res at xyMarkerColors    = colors (2:)              ; Marker color
res at xyMarkerSizeF     = 0.01                     ; Marker size (default 0.01)
res at tmLabelAutoStride = True                     ; nice tick mark labels
plot  = gsn_csm_xy (wks,data(0,:),data(1,:),res) ; create plot

end

Unfortunately all markers have the same color and style. What am i doing wrong?

Thanks in advance
Frank




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