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<div class="moz-cite-prefix">Hi Jennifer,<br>
I've encountered the same issue as Paul with two different
versions of GraDS. My workaround is to split the file into
multiple sub files, but that's undesirable. At some point I will
try to duplicate the error and send the requested info as well. <br>
Eric<br>
On 04/13/2017 11:00 AM, Jennifer M Adams wrote:<br>
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Hi, Paul —
<div>GrADS is having trouble figuring out where to set the pointer
in the data file to read the desired grid — that variable fpos
should not be -2110654536. I would try the following strategy:</div>
<div>1. create a separate non-templated descriptor file for this
particular data file</div>
<div>2. try to display zvort for the first and last time steps and
see if you are still getting the error</div>
<div>3. the fpos variable is calculated based on the current
dimension environment and the structure of the data file (order
of variables, etc.) so if you can duplicate the error with the
one file, please also send the output from ‘q file' and ‘q dims’
before you try your display. </div>
<div>—Jennifer</div>
<div><br>
<div>
<div>On Apr 13, 2017, at 9:48 AM, Paul Markowski <<a
moz-do-not-send="true" href="mailto:pmarkowski@psu.edu">pmarkowski@psu.edu</a>>
wrote:</div>
<br class="Apple-interchange-newline">
<blockquote type="cite">Hello Grads users,<br>
<br>
I was wondering if anyone has ever seen this Grads error
before:<br>
<br>
ga-> d zvort<br>
Low Level I/O Error: Seek error on data file<br>
Data file name = cm1out_00%y4_s.dat<br>
650 rc=-1 fpos=-2110654536 pfi->fhdr=0<br>
Error occurred when seeking to byte -8442618144<br>
Data Request Error: Error for variable 'zvort'<br>
Error ocurred at column 1<br>
DISPLAY error: Invalid expression<br>
Expression = zvort<br>
<br>
In case it matters, I'm trying to display output from George
Bryan's CM1 <br>
model (CM1 is a popular cloud-resolving model used heavily
in the <br>
convective storms community, but is also used by the
boundary layer and <br>
mountain meteorology communities). I've used Grads to
display CM1 <br>
output for 15 years, and this is the first time I've ever
seen this <br>
strange error. It might be noteworthy that I get this error
only for <br>
some of the variables that I'm trying to display. My output
file is ~7 <br>
GB. I've tried both Grads 2.0.1 and 2.1.a3; same error with
both. I <br>
don't know if it has to do with the large file size; perhaps
there's a <br>
"large memory" compile option that wasn't properly used when
the code <br>
was compiled? I'd be grateful for any insight you might
have!<br>
<br>
Paul<br>
<br>
<br>
<br>
<br>
-- <br>
Paul Markowski<br>
Professor of Meteorology<br>
Department of Meteorology and Atmospheric Science<br>
Pennsylvania State University<br>
520 Walker Building<br>
University Park, PA 16802<br>
email: <a moz-do-not-send="true"
href="mailto:pmarkowski@psu.edu">pmarkowski@psu.edu</a><br>
phone: 814.865.9736<br>
web: <a moz-do-not-send="true"
href="http://sites.psu.edu/pmarkowski">http://sites.psu.edu/pmarkowski</a><br>
<br>
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<div style="font-size: 12px; orphans: 2; widows: 2;">--</div>
<div style="font-size: 12px; orphans: 2; widows: 2;">Jennifer
Miletta Adams<br>
Center for Ocean-Land-Atmosphere Studies (COLA)<br>
George Mason University<br>
<br>
<br>
</div>
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<br>
<p><br>
</p>
<pre class="moz-signature" cols="72">--
Dr. Eric Aligo
I. M. Systems Group, Regional Model Developer
NCEP/EMC
5830 University Research Court
College Park, MD 20740, USA
Phone (301) 683-3686
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