No, PPL CLSPLT is NOT the same as CAN MODE META.Once MODE META is set, it remains in force, writing all plot commands to metafiles.
PPL CLSPLT closes a particular metafile. With MODE META remaining set, additional plotting will write to subsequent metafiles (with filenames metafile.plt.~1~, etc).
CAN MODE META turns off the writing to metafiles, but each individual metafile must still be closed with PPL CLSPLT to be complete. Sometimes the metafiles will be valid anyway, but you may notice the final bits of the plot missing from the output of Fprint. Other times, an error such as you report will result.
By the way, on Macs, BOTH commands must be given after a plot, otherwise Ferret crashes. Subsequent plots must be restarted with SET MODE META again.
Billy K On Feb 25, 2009, at 5:07 PM, Paul Young wrote:
Apologies, forgot to add those lines in my example script (I guess PPL CLSPLT is the same as CAN MODE META) - I had indeed used those....So, my original error still stands. Further info -A suggestion that someone emailed was to use a different symbol (e.g. plot/vs/sym=2). This produces a viable postscript, but then I can't get the effect I want. My script has worked fine with the standard map before (i.e. fill my_var), so I guess it's something going on with the fact that I am using map projections....?I have also tried using mp_line.jnl: let lon = x[gx=my_var1[d=1]] + 0*y[gy=my_var1[d=1]] let lat = 0*x[gx=my_var1[d=1]] + y[gy=my_var1[d=1]] let maskx = lon*signif let masky = lat*signifgo mp_line plot/vs/over/sym=dot/nolab xsequence(maskx) ysequence(masky)but this didn't work either (memory failure, but I think the above must be wrong).Paul On Feb 25, 2009, at 5:41 PM, William S. Kessler wrote:You need to start the metafile with SET MODE META before making the plot, and then close the metafile with PPL CLSPLT after finishing your plot. BKOn Feb 25, 2009, at 2:59 PM, Paul Young wrote:Hi all,I'm having a problem generating a postscript file using Fprint. I get the following error:GKSM item 12121226 is undefined ggetgksm() 163 Metafile item is invalid greadgksm() 162 No item is left in GKS Metafile input which I have not had any luck finding on these forums or via google.Essentially, the problem seems to be related to my "shading" certain areas of a fill/ plot with plot/vs. Here's a sketch of what I am doing:use my_data1.nc !Time series of (e.g.) winter averages use my_data2.nc let variance1 = my_var1[d=1,t=@var] !Standard deviation calculation let sd1 = variance1^0.5 let delta = my_var2[d=2,t=@ave] - my_var1[d=1,t=@ave] let signif = if abs(delta) gt sd1 then 1 else 0 set region/x=0:360/y=-90:-20 !Define SH region set grid delta go mp_stereographic_south 0 -40fill/noaxes/nolab/lev=(-80)(-40,40,10)(80)/y=-90:-20/set delta, x_page, y_pageppl title "1981to1986 - 1979to1980: Dec-May Avg" ppl fill go mp_land plot/vs/over/sym=dot/nolab x_page*signif, y_page*signif -----Removing the plot/vs removes the error, so I guess this is where things are going awry.Btw, I tried using the polymark.jnl script to shade the data, but it just shaded a ring around the south pole - don't think I've got the command quite right:go polymark poly/pal=black/over xsequence(x_page), xsequence(y_page), xsequence(signif), circle, 0.2As usual, thanks for any help, Paul----- Paul Young Chemistry and Climate Processes Chemical Sciences Division NOAA Earth System Research Laboratory 325 Broadway R/CSD8 Boulder CO 80305-3328 USA Tel: +1 303-497-4711 Fax: +1 303-497-5686 Email: paul.j.young@xxxxxxxx Web: http://www.esrl.noaa.gov/csd/