<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">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 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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<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>
<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>
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</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>