How to control the y-axis when using gsn_csm_xy?

All,

I want to control the value of Y-axis to range 0. to 0.5. I add two lines:

 res@tiYMin = 0.0

 res@tiYMaxF = 0.5

But it doesn't work:

warning:tiYMin is not a valid resource in pdf_xy at this time

warning:tiYMaxF is not a valid resource in pdf_xy at this time

Thank for any suggestions or solutions!

Hongli

-------------------------

http://www.ncl.ucar.edu/Applications/Scripts/pdf_1.ncl

begin

 a = random_normal (0,50, (/64,128/))

 b = random_chi (2 , (/1000/))

 c = random_gamma (75,2, (/50,100/))

 ap = pdfx(a, 0, False) ; default number of bins

 bp = pdfx(b, 0, False)

 cp = pdfx(c, 0, False)

;------------------------------------------------

; Plot each PDF

;------------------------------------------------

 nVar = 3

 plot = new ( nVar, "graphic")

 wks = gsn_open_wks ("x11","pdf")

 res = True

 res@gsnDraw = False

 res@gsnFrame = False

 res@xyLineThicknessF = 2

 res@tiYAxisString = "PDF (%)"

 res@tiYMin = 0.0

 res@tiYMaxF = 0.5

 res@gsnCenterString = "Univariate PDF: Normal"

 plot(0) = gsn_csm_xy (wks, ap@bin_center, ap, res)

 res@gsnCenterString = "Univariate PDF: Chi (df=2)"

 plot(1) = gsn_csm_xy (wks, bp@bin_center, bp, res)

 res@gsnCenterString = "Univariate PDF: Gamma (75,2)"

 plot(2) = gsn_csm_xy (wks, cp@bin_center, cp, res)

 resP = True

 resP@txString = "Univariate PDFs of Three Variables"

 resP@gsnPanelRowSpec = True ; tell panel what order to
plt

 gsn_panel(wks,plot,(/1,2/),resP)

end

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Received on Mon Mar 1 16:22:33 2010