<div dir="ltr"><div>Do you see it? That very first error message points to the fact that your data file either was not opened successfully or you are not able to access the data within it.</div><div><br></div><div>First thing you should do is confirm you can plot basic fields from the data file.</div><div><br></div><div>Jeff<br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, May 10, 2021 at 10:05 AM Evgeny Gavrilov <<a href="mailto:eugen420@gmail.com">eugen420@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><img src="cid:ii_koispufl0" alt="778.png" width="474" height="378"><br></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, May 10, 2021 at 6:31 PM Jeff Duda <<a href="mailto:jeffduda319@gmail.com" target="_blank">jeffduda319@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div>at least one of your variables or function calls above is wrong based on the error messages. However, because GrADS throws out more messages than the window you showed can contain, I can't see the first error message, which is likely the most important one. Show us that message.</div><div><br></div><div>Jeff Duda<br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, May 10, 2021 at 3:13 AM Evgeny Gavrilov <<a href="mailto:eugen420@gmail.com" target="_blank">eugen420@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"> the map is not drawn again<div><br></div><div><a href="https://www.youtube.com/watch?v=s8JG6BUVh8c" target="_blank">https://www.youtube.com/watch?v=s8JG6BUVh8c</a><div style="outline:currentcolor none medium;padding:10px 0px;width:22px;margin:2px 0px 0px"><br></div></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, May 10, 2021 at 4:57 AM James Potemra <<a href="mailto:jimp@hawaii.edu" target="_blank">jimp@hawaii.edu</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div>
<p>Evgeny,</p>
<p>You have a lot of curiosities in your script. First, it's never
a good to mix GrADS variables (e.g., "t") with your own:</p>
<p>'set t 1 20'<br>
'define t=tmpprs(lev=850)'</p>
<p>instead of 'define t=' maybe make this 'define temp=' or
something like that. Second, you have <br>
</p>
<p>'define a = thetae'</p>
<p>but thetae is not defined anywhere. Third, no need set time
range every time you define the variables; set it once. Finally,
as Jeff suggested a while back, you'll need to add quotes to get
the time index as a number:</p>
<p>'d a - a(t-1)' --> 'd a - a(t='i-1')</p>
<p>---------------------------</p>
<p>* set URL for data<br>
'sdfopen
<a href="https://nomads.ncep.noaa.gov/dods/gfs_0p25/gfs20210509/gfs_0p25_12z" target="_blank">https://nomads.ncep.noaa.gov/dods/gfs_0p25/gfs20210509/gfs_0p25_12z</a>'<br>
<br>
* define lat/lon/time ranges<br>
'set lon 30 50'<br>
'set lat 40 50'<br>
'set t 1 81'<br>
<br>
* define variables<br>
'define temp=tmpprs(lev=850)'<br>
'define rh=rhprs(lev=850)'<br>
'define
dewp850mb=(t-273.15)-((14.55+0.114*(t-273.15))*(1-0.01*rh)+pow((2.5+0.007*(t-273.15))*(1-0.01*rh),3)+(15.9+0.117*(t-273.15))*pow((1-0.01*rh),14))'<br>
'define vapr850mb=6.112*exp((17.67*dewp850mb)/(dewp850mb+243.5))'<br>
'define e850mb=vapr850mb*1.001+(850-100)/900*0.0034'<br>
'define w850mb=0.62197*(e850mb/(850-e850mb))'<br>
'define te850mb=(t+(2260000*w850mb/1004))'<br>
'define epa=(te850mb*pow((1000/850),(287/1004)))-273.16'<br>
<br>
</p>
* draw maps<br>
maps = 20<br>
'set display color white'<br>
i = 1<br>
while ( i<maps )<br>
'set t ' i<br>
'set gxout shaded'<br>
* I have not idea what you want to do, but this will display the
difference between the current timestep and the one prior <br>
'd temp - temp(t='i-1')'<br>
'cbarn'<br>
'clear'<br>
i=i+1<br>
endwhile
<p>-------------------------<br>
</p>
<p><br>
</p>
<div>On 5/9/21 9:02 AM, Evgeny Gavrilov
wrote:<br>
</div>
<blockquote type="cite">
<div dir="ltr">All the same. The maps are not drawn
<div><br>
</div>
<div>You can run my script: </div>
<div><br>
</div>
<div>'reinit'</div>
<div><br>
</div>
'sdfopen <a href="https://nomads.ncep.noaa.gov/dods/gfs_0p25/gfs20210509/gfs_0p25_12z" target="_blank">https://nomads.ncep.noaa.gov/dods/gfs_0p25/gfs20210509/gfs_0p25_12z</a>'<br>
<br>
'set lon 30 50'<br>
'set lat 40 50'<br>
<br>
'set display color white'<br>
<br>
maps = 20<br>
i = 1<br>
while ( i<maps )<br>
'set t ' i<br>
<br>
'set t 1 20'<br>
'define t=tmpprs(lev=850)'
<div>'set t 1 20' <br>
'define rh=rhprs(lev=850)'<br>
'set t 1 20' <br>
'define
dewp850mb=(t-273.15)-((14.55+0.114*(t-273.15))*(1-0.01*rh)+pow((2.5+0.007*(t-273.15))*(1-0.01*rh),3)+(15.9+0.117*(t-273.15))*pow((1-0.01*rh),14))'<br>
'set t 1 20' <br>
'define
vapr850mb=6.112*exp((17.67*dewp850mb)/(dewp850mb+243.5))'<br>
'set t 1 20' <br>
'define e850mb=vapr850mb*1.001+(850-100)/900*0.0034'<br>
'set t 1 20' <br>
'define w850mb=0.62197*(e850mb/(850-e850mb))'<br>
'set t 1 20' <br>
'define te850mb=(t+(2260000*w850mb/1004))'<br>
'set t 1 20'<br>
'define epa=(te850mb*pow((1000/850),(287/1004)))-273.16'<br>
<br>
'set gxout shaded'
<div>'define a = thetae'
<div>'d a - a(t-1)'<br>
'cbarm'<br>
<br>
'printim C:\Users\123\for\temp_'i'.png x800 y600'<br>
<br>
'clear'<br>
<br>
i=i+1<br>
endwhile<br>
<br>
<div>return <br>
</div>
</div>
</div>
</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Sun, May 9, 2021 at 8:54 PM
Jeff Duda <<a href="mailto:jeffduda319@gmail.com" target="_blank">jeffduda319@gmail.com</a>> wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div dir="ltr">
<div>Oh, yeah...I missed that. Good catch, James!</div>
<div><br>
</div>
<div>But the display command I suggested to him (d a -
a(t-1)) certainly is valid for plotting the 1-time-step
change in thetae, which I presume is what he wanted
originally. It depends on the final graphic type he is
trying to produce.<br>
</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Sun, May 9, 2021 at
10:41 AM James Potemra <<a href="mailto:jimp@hawaii.edu" target="_blank">jimp@hawaii.edu</a>> wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div>
<p>You are not defining the time correctly. In this new
script you define "thetae", and this is still only
defined for a single time-step. You need to put the
"set t 1 81" before any variable you want to be a
function of time. Also, your statement "d a-a(t-1)"
doesn't make sense since "a" (if defined properly)
will be a function of time/lat/lon. If you want to
plot 81 contour plots, each one as a different between
current time and time before, you'll have to script
that like you did in your first example.</p>
<p>Jim<span style="color:rgb(80,0,80)"><br>
</span></p>
<div>On 5/8/21 12:52 PM, Evgeny Gavrilov wrote:<br>
</div>
<blockquote type="cite">
<div dir="ltr">this command: 'set t 1 81' before
'define' does not solve this problem<br>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Sun, May 9,
2021 at 1:11 AM Jeff Duda <<a href="mailto:jeffduda319@gmail.com" target="_blank">jeffduda319@gmail.com</a>>
wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div dir="ltr">
<div>What do you mean by "doesn't help"? We need
specifics to be able to fully help you.</div>
<div><br>
</div>
<div>Jeff Duda<br>
</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Sat, May 8,
2021 at 1:53 PM Evgeny Gavrilov <<a href="mailto:eugen420@gmail.com" target="_blank">eugen420@gmail.com</a>>
wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div dir="ltr"> still doesn't help 'set t 1
81'
<div><br>
</div>
<div><span style="color:rgb(80,0,80)">'reinit'<br>
<br>
'sdfopen <a href="https://nomads.ncep.noaa.gov/dods/gfs_0p25/gfs20210508/gfs_0p25_12z" target="_blank">https://nomads.ncep.noaa.gov/dods/gfs_0p25/gfs20210508/gfs_0p25_12z</a>'<br>
<br>
'set mpdset hires'<br>
'set lon 10 30'<br>
'set lat 40 50'<br>
<br>
'set display color white'<br>
<br>
'set gxout shaded'<br>
</span>'define tc = tmpprs(lev=850)'<br>
'define rh = rhprs(lev=850)'<br>
'define dewp850mb =
(tc-273.15)-((14.55+0.114*(tc-273.15))*(1-0.01*rh)+pow((2.5+0.007*(tc-273.15))*(1-0.01*rh),3)+(15.9+0.117*(tc-273.15))*pow((1-0.01*rh),14))'<br>
'define vapr850mb =
6.112*exp((17.67*dewp850mb)/(dewp850mb+243.5))'<br>
'define e850mb =
vapr850mb*1.001+(850-100)/900*0.0034'<br>
'define w850mb =
0.62197*(e850mb/(850-e850mb))'<br>
'define te850mb =
(tc+(2260000*w850mb/1004))'<br>
'define thetae =
(te850mb*pow((1000/850),(287/1004)))-273.16'<br>
<br>
'set t 1 81'<br>
'define a = thetae'<span style="color:rgb(80,0,80)"><br>
'd a-a(t-1)'<br>
'cbarm'<br>
<br>
'printim C:\Users\for\temp.png x800
y600'<br>
<br>
'clear'<br>
<br>
return</span></div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Sat,
May 8, 2021 at 11:15 PM Evgeny Gavrilov
<<a href="mailto:eugen420@gmail.com" target="_blank">eugen420@gmail.com</a>>
wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div dir="ltr">still doesn't help 'set t 1
81'
<div><br>
</div>
<div>'reinit'<br>
<br>
'sdfopen <a href="https://nomads.ncep.noaa.gov/dods/gfs_0p25/gfs20210508/gfs_0p25_12z" target="_blank">https://nomads.ncep.noaa.gov/dods/gfs_0p25/gfs20210508/gfs_0p25_12z</a>'<br>
<br>
'set mpdset hires'<br>
'set lon 10 30'<br>
'set lat 40 50'<br>
<br>
'set display color white'<br>
<br>
'set gxout shaded'<br>
'define tc = tmpprs(lev=850)'<br>
'define rh = rhprs(lev=850)'<br>
'define dewp850mb =
(tc-273.15)-((14.55+0.114*(tc-273.15))*(1-0.01*rh)+pow((2.5+0.007*(tc-273.15))*(1-0.01*rh),3)+(15.9+0.117*(tc-273.15))*pow((1-0.01*rh),14))'<br>
'define vapr850mb =
6.112*exp((17.67*dewp850mb)/(dewp850mb+243.5))'<br>
'define e850mb =
vapr850mb*1.001+(850-100)/900*0.0034'<br>
'define w850mb =
0.62197*(e850mb/(850-e850mb))'<br>
'define te850mb =
(tc+(2260000*w850mb/1004))'<br>
'define thetae =
(te850mb*pow((1000/850),(287/1004)))-273.16'<br>
<br>
'set t 1 81'<br>
'define a = thetae'<br>
'd a-a(t-1)'<br>
'cbarm'<br>
<br>
'printim C:\Users\for\temp.png x800
y600'<br>
<br>
'clear'<br>
<br>
return<br>
</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On
Sat, May 8, 2021 at 10:54 PM James T.
Potemra <<a href="mailto:jimp@hawaii.edu" target="_blank">jimp@hawaii.edu</a>>
wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div>
<p>You will have to set the time
range before defining variable
'a', otherwise it will only be
defined for a single time step.
Try add 'set t 1 81' before
defining 'a'.</p>
<p>Jim<br>
</p>
<div>On 5/8/21 8:42 AM, Evgeny
Gavrilov wrote:<br>
</div>
<blockquote type="cite">
<div dir="ltr">"i" from while.
<div><br>
</div>
<div>maps = 20<br>
i = 1<br>
while ( i<maps )<br>
'set t ' i <br>
</div>
<div><br>
</div>
<div>2) a-a(t=1) also has a
report about constant field
(value=0) </div>
<div><br>
</div>
<div>'reinit'<br>
<br>
'sdfopen <a href="https://nomads.ncep.noaa.gov/dods/gfs_0p25/gfs20210508/gfs_0p25_12z" target="_blank">https://nomads.ncep.noaa.gov/dods/gfs_0p25/gfs20210508/gfs_0p25_12z</a>'<br>
<br>
'set mpdset hires'<br>
'set lon 10 30'<br>
'set lat 40 50'<br>
<br>
'set display color white'<br>
<br>
'set gxout shaded'<br>
'define a = tmp2m'<br>
'd a-a(t-1)'<br>
'cbarm'<br>
<br>
'printim C:\Users\for\temp.png
x800 y600'<br>
<br>
'clear'<br>
<br>
return<br>
</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Sat, May
8, 2021 at 10:11 PM Jeff Duda
<<a href="mailto:jeffduda319@gmail.com" target="_blank">jeffduda319@gmail.com</a>>
wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div dir="ltr">
<div>1a) How is 'i' set?</div>
<div>1b) I don't think the
grads scripting language
supports math in a command
line command like that.
You'd have to do something
like</div>
<div>i = 1</div>
<div>i2 = i-1</div>
<div>'d a(t='i') -
a(t='i2')'</div>
<div><br>
</div>
<div>2) This command is
equivalent and does not
require a script variable
(provided your dimension
environment is set
appropriately): 'd a -
a(t-1)'</div>
<div><br>
</div>
<div>Jeff Duda<br>
</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Sat,
May 8, 2021 at 12:01 PM
Evgeny Gavrilov <<a href="mailto:eugen420@gmail.com" target="_blank">eugen420@gmail.com</a>>
wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div dir="ltr">why this
method does not
working? <br>
<div><br>
</div>
<div>'set gxout shaded'<br>
'define a=tmp2m'<br>
'd a(t='i') -
a(t='i-1')' <br>
</div>
<div><br>
</div>
<div>report: constant
field. value = 0 </div>
</div>
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<div>
<div dir="ltr">
<div>
<div dir="ltr">
<div dir="ltr">
<div dir="ltr">
<div dir="ltr">
<div dir="ltr"><font size="2"><span>Jeff
Duda, Research
Scientist</span></font></div>
<div dir="ltr"><font size="2"><span></span></font>University
of Colorado
Boulder</div>
<div dir="ltr"><font size="2"><span></span></font>Cooperative
Institute for
Research in
Environmental
Sciences</div>
<div dir="ltr">NOAA/OAR/ESRL/Global
Systems
Laboratory<br>
<font size="2"><span>
<span>Boulder,
CO<br>
</span></span></font>
</div>
</div>
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<div dir="ltr">
<div>
<div dir="ltr">
<div>
<div dir="ltr">
<div dir="ltr">
<div dir="ltr">
<div dir="ltr">
<div dir="ltr"><font size="2"><span>Jeff
Duda, Research Scientist</span></font></div>
<div dir="ltr"><font size="2"><span></span></font>University
of Colorado Boulder</div>
<div dir="ltr"><font size="2"><span></span></font>Cooperative
Institute for Research in
Environmental Sciences</div>
<div dir="ltr">NOAA/OAR/ESRL/Global
Systems Laboratory<br>
<font size="2"><span> <span>Boulder,
CO<br>
</span></span></font> </div>
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<div dir="ltr">
<div>
<div dir="ltr">
<div>
<div dir="ltr">
<div dir="ltr">
<div dir="ltr">
<div dir="ltr">
<div dir="ltr"><font size="2"><span>Jeff
Duda, Research Scientist</span></font></div>
<div dir="ltr"><font size="2"><span></span></font>University
of Colorado Boulder</div>
<div dir="ltr"><font size="2"><span></span></font>Cooperative
Institute for Research in Environmental
Sciences</div>
<div dir="ltr">NOAA/OAR/ESRL/Global Systems
Laboratory<br>
<font size="2"><span>
<span>Boulder, CO<br>
</span></span></font>
</div>
</div>
</div>
</div>
</div>
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</blockquote>
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</blockquote></div>
_______________________________________________<br>
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<a href="mailto:gradsusr@gradsusr.org" target="_blank">gradsusr@gradsusr.org</a><br>
<a href="http://gradsusr.org/mailman/listinfo/gradsusr" rel="noreferrer" target="_blank">http://gradsusr.org/mailman/listinfo/gradsusr</a><br>
</blockquote></div><br clear="all"><br>-- <br><div dir="ltr"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><font size="2"><span>Jeff Duda, Research Scientist</span></font></div><div dir="ltr"><font size="2"><span></span></font>University of Colorado Boulder</div><div dir="ltr"><font size="2"><span></span></font>Cooperative Institute for Research in Environmental Sciences</div><div dir="ltr">NOAA/OAR/ESRL/Global Systems Laboratory<br><font size="2"><span>
<span>Boulder, CO<br></span></span></font>
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_______________________________________________<br>
gradsusr mailing list<br>
<a href="mailto:gradsusr@gradsusr.org" target="_blank">gradsusr@gradsusr.org</a><br>
<a href="http://gradsusr.org/mailman/listinfo/gradsusr" rel="noreferrer" target="_blank">http://gradsusr.org/mailman/listinfo/gradsusr</a><br>
</blockquote></div>
</blockquote></div><br clear="all"><br>-- <br><div dir="ltr" class="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><font size="2"><span>Jeff Duda, Research Scientist</span></font></div><div dir="ltr"><font size="2"><span></span></font>University of Colorado Boulder</div><div dir="ltr"><font size="2"><span></span></font>Cooperative Institute for Research in Environmental Sciences</div><div dir="ltr">NOAA/OAR/ESRL/Global Systems Laboratory<br><font size="2"><span>
<span>Boulder, CO<br></span></span></font>
</div></div></div></div></div></div></div></div></div></div>