/usr/share/ncarg/nclex/ngmath/nm14n.ncl is in libncarg-data 6.3.0-6build1.
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; ;
; Copyright (C) 1998 ;
; University Corporation for Atmospheric Research ;
; All Rights Reserved ;
; ;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;
; File: nm14n.ncl
;
; Author: Fred Clare
; National Center for Atmospheric Research
; PO 3000, Boulder, Colorado
;
; Date: Tue Nov 17 15:46:53 MST 1998
;
; Description: Demo of the effect of weighting the input points using csa1xs.
;
load "$NCARG_ROOT/lib/ncarg/nclex/gsun/gsn_code.ncl"
begin
;----------- Define original data and initial weighting array -----------
xi = (/0.0, 0.2, 0.4, 0.6, 0.8, 1.0/)
yi = (/0.0, 1.0, -0.7, -0.2, -0.1, 0.0/)
wts = (/1.0, 1.0, 1.0, 1.0, 1.0, 1.0/)
npts = 101
xo = fspan(0.0,1.0,npts) ; Create the output X coordinate array.
xx = (/0.0, 1.0/) ; Create data for a polyline for marking
yy = (/0.0, 0.0/) ; the Y = 0.0 line in each graph.
;--- Calculate approximated function values using different wieghts.
yo1 = csa1xs(xi,yi,wts,5,0.0,0,xo)
wts(1) = 0.5
yo2 = csa1xs(xi,yi,wts,5,0.0,0,xo)
wts(1) = 0.0
yo3 = csa1xs(xi,yi,wts,5,0.0,0,xo)
;---- Open workstation, define color map ---------------------------
wks_type = "ncgm"
wks = gsn_open_wks(wks_type,"nm14n")
cmap = (/ \
(/1.,1.,1./), \
(/0.,0.,0./), \
(/1.,0.,0./), \
(/0.,0.,1./) \
/)
gsn_define_colormap(wks,cmap)
;---- Specify resources ---------------------------
txres = True ; Set up some variables for
xyres = True ; creating three different
gsres = True ; resource lists.
xyres@gsnFrame = False ; Don't advance the frame.
xyres@tmXTBorderOn = False ; Don't draw top axis.
xyres@tmXTOn = False ; Don't draw top axis tick marks.
xyres@tmBorderThicknessF = 1.0 ; Default thickness is 2.0
xyres@tmXBLabelFont = 21 ; Change X label font.
xyres@tmXBLabelFontHeightF = 0.025 ; Change font size.
xyres@tmXBMajorLengthF = 0.015 ; Default is 0.02.
xyres@tmXBMajorThicknessF = 1.0 ; Default is 2.
xyres@tmXBMinorLengthF = 0.0075 ; Default is 0.01.
xyres@tmXBMinorPerMajor = 4 ; # of minor tick marks per major.
xyres@tmXBMode = "Manual" ; Set tick mark mode.
xyres@tmXBTickStartF = 0.0
xyres@tmXBTickEndF = 1.0
xyres@tmXBTickSpacingF = 0.2
xyres@tmXMajorGridThicknessF = 1.0 ; Default is 2.0
xyres@tmYLLabelFont = 21 ; See explanations for X axes
xyres@tmYLLabelFontHeightF = 0.025 ; resources.
xyres@tmYLMajorLengthF = 0.015
xyres@tmYLMajorThicknessF = 1.0
xyres@tmYLMinorPerMajor = 0
xyres@tmYLMode = "Manual"
xyres@tmYLTickStartF = -1.0
xyres@tmYLTickEndF = 1.0
xyres@tmYLTickSpacingF = 0.5
xyres@tmYRBorderOn = False ; Don't draw right axis.
xyres@tmYROn = False ; Don't draw right axis tick marks.
xyres@trXMinF = 0.0
xyres@trXMaxF = 1.0 ; Specify data limits.
xyres@trYMaxF = 1.0
xyres@trYMinF = -1.0
xyres@vpHeightF = 0.20 ; Specify size and location of plot.
xyres@vpWidthF = 0.80
xyres@vpXF = 0.13
xyres@vpYF = 0.88
;----------- First graph --------------------------------------------
xy = gsn_xy(wks,xo,yo1,xyres) ; Plot the approximzted curve created
; with equal weights.
xyres@xyMarkLineMode = "Markers" ; Set line mode to "Markers".
xyres@xyMarkerColor = 3 ; Set markers to blue.
xyres@xyMarkerSizeF = 0.025 ; Make markers larger.
xy = gsn_xy(wks,xi,yi,xyres) ; Mark the original points with blue Xs.
txres@txFont = 21 ; Change the default font.
txres@txFontHeightF = 0.03 ; Set the font height.
gsn_text(wks,xy,"Weights = (1., 1., 1., 1., 1., 1.)",0.65,0.7,txres)
gsres@gsLineColor = 2 ; Set polyline color to red.
gsn_polyline(wks,xy,xx,yy,gsres) ; Draw polyline at Y=0.
;----------- Second graph, on same picture --------------------------------
xyres@vpYF = 0.58 ; Set Y location of plot.
xyres@xyMarkLineMode = "Lines" ; Set line mode to "Lines".
xy = gsn_xy(wks,xo,yo2,xyres) ; Plot the approximated curve
; created using a weight of 0.5
; to the second input point.
xyres@xyMarkLineMode = "Markers" ; Set line mode to "Markers".
xy = gsn_xy(wks,xi,yi,xyres) ; Mark original points.
txres@txFontHeightF = 0.03 ; Set font height.
gsn_text(wks,xy,"Weights = (1., .5, 1., 1., 1., 1.)",0.65,0.7,txres)
gsn_polyline(wks,xy,xx,yy,gsres) ; Draw polyline at Y=0.
;----------- Third graph, same picture --------------------------------
xyres@vpYF = 0.28 ; Set Y location of plot.
xyres@xyMarkLineMode = "Lines" ; Set line mode.
xy = gsn_xy(wks,xo,yo3,xyres) ; Plot the approximated curve created
; using a zero weight for the second
; input point.
xyres@xyMarkLineMode = "Markers" ; Set line mode.
xy = gsn_xy(wks,xi,yi,xyres) ; Plot the original points with markers.
txres@txFontHeightF = 0.03 ; Set font height.
gsn_text(wks,xy,"Weights = (1., 0., 1., 1., 1., 1.)",0.65,0.7,txres)
gsn_polyline(wks,xy,xx,yy,gsres) ; Draw polyline at Y=0.
;------------- Main title ------------------------------------------
txres@txFontHeightF = 0.04 ; Change the font height.
gsn_text_ndc(wks,"~F21~Effect of data weights",.5,.95,txres)
;------------- Plot and clean up -----------------------------------
frame(wks)
delete(xy)
delete(txres)
delete(gsres)
delete(xyres)
end
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