小白求助~~~

金理旭

刚开始学NCL，现在相出一张多折线图，并在xy折线图中[-40,1]处添加红色星号，在[-30,1]与[-20，两点处绘制任意蓝色折线，但是出现了报错。我把一部分代码写上来，请大家帮帮忙！谢谢了！

;add a mark in [-40,1], just regard this mark as Nanjing
;add a broken line, just regard the typhoon path as broken line
begin
  npts = 500
  x    = fspan(-100,100,npts)   ; 500 values from -100 to 100.

  x1 = -40
  y1 = 1

  x_line = (/-30,-20/)
  y_line = (/1,-1/)

  y = new((/4,500/),"float")
  y(0,:) = sin(0.0628*x)     
  y(1,:) = cos(0.0628*x)
  y(2,:) = cos(0.0628*x)*sin(0.0628*x)  
  y(3,:) = cos(0.0628*x)+sin(0.0628*x)  

  wks = gsn_open_wks("eps","xy_legend_ex")


  ;the range or X/Y aixs

  res = True
  res@trXMinF           = min(x)            
  res@trXMaxF           = max(x)
  res@trYMinF           = min(y)-0.2   ;áô3öêêμ±μÄ¿Õ°×￡¬»æÖÆlegend
  res@trYMaxF           = max(y)+0.6   ;

  ;res part
  ;Line thickness, colors, dash pattern mode, labal of each line,
  ;legend mode, labels, width, height, orthogonal position, parallel position
  res@xyLineThicknesses = (/1,2,3,4/) ;ÿ¸ö¶Ôó|¸ö′Öϸ￡¬èôÖ»óDò»ìõÏß¾íò»¸öÖμ￡¬×￠òaes   
  res@xyLineColors = (/"black","black","black","black"/)
  res@xyDashPatterns = (/0,2,4,6/) ;appendix H.6
  res@pmLegendDisplayMode = "Always" ;ìí¼óí¼ày
  res@xyExplicitLegendLabels = (/"one","two","three","four"/);ÿìõÕÛÏßμÄÃû3Æ
  res@pmLegendWidthF = 0.2 ;í¼àyμÄ¿í¶è
  res@pmLegendHeightF = 0.1 ;í¼àyμĸ߶è
  res@pmLegendOrthogonalPosF = -1.05
  res@pmLegendParallelPosF = 0.82

  plot = gsn_csm_xy(wks,x,y,res)

  ;add marker
  mkres = True
  mkres@gsMarkerColor = "blue"
  mkres@gsMarkerIndex = 12
  mkres@gsMarkerSizeF = 0.02
  dum1 = gsn_add_polymarker(wks, plot, x, y, mkres)

  ;add line
  lnres = True
  lnres@gsLineColor = "red"
  lnres@gsLineDashPattern = 16
  lnres@gsLineThicknessF = 3.0
  dum2 = gsn_add_polyline(wks, plot, x_line, y_line, lnres)

  draw(plot)
  frame(wks)
end

弓长铭

1. dum1 = gsn_add_polymarker(wks, plot, -40, 1, mkres)   ;
   

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ps:
draw(plot)
frame(wks)一般不是与下面两句一起用吗？我也是NCL小白，希望能帮到你，

1. res@gsnDraw           = False
   
2. res@gsnFrame          = False
   

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vantussy

再过几天我也要学了，看着有点难啊