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Andy, There is no problem with grids for different dates so long as you specify the full gempak time, and not just fxxx. The following are the settings I used to generate a difference plot using gdplot2, which should similarly work in other gd programs (I'd suggest migrating to gdplot2 away from gdplot anyhow). The output (quick and dirty) is shown at: http://www.unidata.ucar.edu/staff/chiz/gifs/aveeu_avemrf_sub.gif GDFILE = mrf_ecna.gem GDATTIM = 020218/1200F156:020218/1200F240 GLEVEL = 850 GVCORD = pres PANEL = 0 SKIP = 0 SCALE = 999 GDPFUN = sub(AVEEU,AVEMRF^020219/0000F144:020219/0000F228) TYPE = C CONTUR = 0 CINT = 0 LINE = 3 FINT = 0 FLINE = 10-20 HILO = HLSYM = CLRBAR = WIND = BM1 REFVEC = TITLE = 1 TEXT = 1 CLEAR = YES GAREA = uslcc PROJ = lcc MAP = 1 LATLON = DEVICE = gif STNPLT = SATFIL = RADFIL = LUTFIL = STREAM = POSN = 0 COLORS = 1 MARKER = 0 GRDLBL = 0 FILTER = YES GEMPAK-GDPLOT2> Steve Chiswell >From: "Siffert, Andy" <address@hidden> >Organization: UCAR/Unidata >Keywords: 200202192223.g1JMNBx05696 >This message is in MIME format. Since your mail reader does not understand >this format, some or all of this message may not be legible. > >------_=_NextPart_000_01C1B993.EA399D60 >Content-Type: text/plain; > charset="iso-8859-1" > > >Steve, >I cannot seem to get this to work in gdplot. >I understand if you specify a time in gfunc that it overrides what you >specify in gdattim. >However, I think my problem is that the dates are different. >What else might I try. Attached is the .gem file it's two megs roughly > > GEMPAK-GDPLOT>l > GDFILE = mrf_ecna.gem > GDATTIM = 020218/1200F156:020218/1200F240 > GLEVEL = 850 > GVCORD = pres > PANEL = > SKIP = 0 > SCALE = 999 > GFUNC = sub(AVEEU,AVEMRF^020219/0000F144:020219/0000F228) > CTYPE = C/F > CONTUR = 0 > CINT = 4/-30/30 > LINE = 32/10/0.5/1 > FINT = -30;-28;-26;-24;-22;-20;-18;-16;-14;-12;-10;-8;-6;-4;-2;0 > FLINE = 16-11;31-28;4;24-27;6;0 > HILO = > HLSYM = > CLRBAR = > GVECT = > WIND = > REFVEC = > TITLE = 31/-1/MRF /ECMWF 7-10 day Avg 850 mb Temp c > TEXT = 1 > CLEAR = yes > GAREA = US > PROJ = str/90;-100;-3 > MAP = 23 > LATLON = 0 > DEVICE = xw > STNPLT = > >-----Original Message----- >From: Unidata Support [mailto:address@hidden] >Sent: Tuesday, February 19, 2002 3:48 PM >To: Siffert, Andy >Cc: 'Unidata Support' >Subject: 20020219: Plotting two differnt PARM at two diff. times > > >>From: "Siffert, Andy" <address@hidden> >>Organization: UCAR/Unidata >>Keywords: 200202192141.g1JLfjx00339 > >> >> >>Hello, >>I'm trying to figure out how to plot the difference between two different >>PARM at two different times on to one plot. In this case I have created and >>.gem file with AVEEU which is the Avg. of the ECMWF from the given times. >>AVEMRF is the Avg. of the MRF from the given times. >> >> >>GEMPAK-GDINFO>: >>NUM TIME1 TIME2 LEVL1 LEVL2 VCORD PARM >>2 020218/1200F156 020218/1200F240 850 PRES AVEEU >>13 020219/0000F144 020219/0000F228 850 PRES AVEMRF >> >>I'm not sure how and what I can use to plot the differences between the two >>PARM. >> >>gdplot will not work because I have two different times. >> >>that or I'm not specifying my >>gddattim and gfunc properly. >> >>Any idea's would be greatly appreciated. >> >>Thanks, >>Andy >> > >Andy, > >Use an any gempak program (including gdplot): > >GVCORD=PRES >GLEVEL=850 >GDATTIM=020218/1200F156:020218/1200F240 >GFUNC=sub(AVEEU,AVEMRF^020219/0000F144:020219/0000F228) > >You can override time, vertical coordinate and level for any >paremeter using the ^, @, and % parameters as specified in >the "phelp gparm" help. > >Also, review the tutorial: >http://www.unidata.ucar.edu/packages/gempak/tutorial/diagnostics.html > >Steve Chiswell >**************************************************************************** >< >Unidata User Support UCAR Unidata Program >< >(303)497-8644 P.O. Box 3000 >< >address@hidden Boulder, CO 80307 >< >---------------------------------------------------------------------------- >< >Unidata WWW Service http://www.unidata.ucar.edu/ >< >**************************************************************************** >< > > >