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<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 class="moz-cite-prefix">On 5/8/21 8:42 AM, Evgeny Gavrilov
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAKh9uO8G_VS365rvfuXY87ZpEkjkbaqLz_SUF4F3SpCAj_XS3A@mail.gmail.com">
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<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"
moz-do-not-send="true">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>
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<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"
moz-do-not-send="true">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"
moz-do-not-send="true">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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<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>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
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