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I've modified (highlighted text) Lines 157 through 189 in xcbar.gs to save the result (a text file called ref_shade_info) of 'q shades' for future use. I'm having trouble figuring out how to use the _shdinfo variable you had suggested for use outside of xcbar.gs.</div>
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I've also attached ref_shade_info to this email for reference.</div>
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My colorbar is</div>
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<u><b>My Attempt:</b></u></div>
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*** get shade information ***
<div> if( cnum = -1 )</div>
<div>* 'q shades'</div>
<div><span style="background-color: rgb(255, 255, 0);"> istat = 0</span></div>
<div><span style="background-color: rgb(255, 255, 0);"> while (istat != 2)</span></div>
<div><br>
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<div><span style="background-color: rgb(255, 255, 0);"> data = read('ref_shade_info')</span></div>
<div><span style="background-color: rgb(255, 255, 0);"> shdinfo = sublin(data,2)</span></div>
<div><span style="background-color: rgb(255, 255, 0);"> say shdinfo</span></div>
<div>* dummy=write('ref_shade_info',shdinfo)</div>
<div> if ( subwrd( shdinfo, 1 ) = 'None' ) </div>
<div> say 'Error in xcbar.gs: No shading information'</div>
<div> return</div>
<div> endif</div>
<div><br>
</div>
<div>* number of colors</div>
<div> cnum = subwrd( shdinfo, 5 )</div>
<div> if( cnum <= 0 )</div>
<div> say 'Error in xcbar.gs: Number of color is zero'</div>
<div> return</div>
<div> endif</div>
<div><br>
</div>
<div>* color and (higher) levels</div>
<div> i = 1</div>
<div> while( i <= cnum )</div>
<div> rec = sublin( shdinfo, i+1 )</div>
<div> col.i = subwrd( rec, 1 )</div>
<div> hi.i = subwrd( rec, 3 )</div>
<div> i = i + 1</div>
<div> endwhile</div>
<div><span style="background-color: rgb(255, 255, 0);"> endwhile</span></div>
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endif<br>
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Am I on the right track?</div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> gradsusr <gradsusr-bounces@gradsusr.org> on behalf of Perry, Aaron <axp09171@alumni.northernvermont.edu><br>
<b>Sent:</b> Tuesday, April 12, 2022 9:08 AM<br>
<b>To:</b> GrADS Users Forum <gradsusr@gradsusr.org><br>
<b>Subject:</b> Re: [gradsusr] [EXTERNAL] Re: Plotting xcbar.gs Even When There is No Valid Data</font>
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Ok, thank you for that clarification!</div>
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I will give the process a try and update back later today.</div>
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<div id="x_divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> gradsusr <gradsusr-bounces@gradsusr.org> on behalf of Adams, Jennifer M. (GSFC-610.2)[ADNET SYSTEMS INC] <jennifer.m.adams@nasa.gov><br>
<b>Sent:</b> Tuesday, April 12, 2022 8:49 AM<br>
<b>To:</b> GrADS Users Forum <gradsusr@gradsusr.org><br>
<b>Subject:</b> Re: [gradsusr] [EXTERNAL] Re: Plotting xcbar.gs Even When There is No Valid Data</font>
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<p class="x_x_MsoNormal">Yes, but you also need to use a modified version of xcbar.gs that uses your saved shade information instead of calling ‘q shades’ again.
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<p class="x_x_MsoNormal"><span style="font-size:9.0pt">-- <span style="color:black"><br>
Jennifer Miletta Adams<br>
Senior Scientific Software Developer<br>
Goddard Earth Sciences Data and Information Services Center (GES DISC)</span></span></p>
<p class="x_x_MsoNormal"><span style="font-size:9.0pt; color:black">NASA/GSFC, Code 610.2</span><span style="font-size:9.0pt">
</span></p>
<p class="x_x_MsoNormal"><span style="font-size:9.0pt; color:#AFABAB">Building 32, Room S159</span></p>
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<p class="x_x_MsoNormal"><b><span style="font-size:12.0pt; color:black">From: </span>
</b><span style="font-size:12.0pt; color:black">gradsusr <gradsusr-bounces@gradsusr.org> on behalf of "Perry, Aaron" <axp09171@alumni.northernvermont.edu><br>
<b>Reply-To: </b>GrADS Users Forum <gradsusr@gradsusr.org><br>
<b>Date: </b>Tuesday, April 12, 2022 at 8:45 AM<br>
<b>To: </b>GrADS Users Forum <gradsusr@gradsusr.org><br>
<b>Subject: </b>[EXTERNAL] Re: [gradsusr] Plotting xcbar.gs Even When There is No Valid Data</span></p>
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<p class="x_x_MsoNormal"> </p>
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<p class="x_x_MsoNormal"><span style="font-size:12.0pt; color:black">Thank you very much for the quick reply, Jennifer!</span></p>
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<p class="x_x_MsoNormal"><span style="font-size:12.0pt; color:black"> </span></p>
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<p class="x_x_MsoNormal"><span style="font-size:12.0pt; color:black">So to reiterate, I need to save the 'q shades' output from a forecast hour with valid data and then use that same output for a forecast hour that has no data, (instead of running 'q shades'
again on the forecast hour with no data) therefore preserving the desired colorbar on the plot.</span></p>
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<p class="x_x_MsoNormal" style="background:white"><b><span style="font-size:14.0pt; color:#006FC9">Aaron Perry</span></b><span style="font-size:10.0pt; font-family:"Tahoma",sans-serif; color:black"></span></p>
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<p class="x_x_MsoNormal" style="background:white"><span style="font-size:12.0pt; color:#006FC9">Meteorologist<br>
Class of '16<br>
Northern Vermont University-Lyndon</span><span style="font-family:"Tahoma",sans-serif; color:black"></span></p>
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<p class="x_x_MsoNormal" style="background:white"><span style="font-size:10.0pt; color:#006FC9">(formerly Lyndon State College)</span><span style="font-size:12.0pt; color:#006FC9"><br>
Boston, Mass.</span><span style="font-size:10.0pt; font-family:"Tahoma",sans-serif; color:black"></span></p>
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<p class="x_x_MsoNormal" style="background:white"><span style="font-size:12.0pt; color:#006FC9">Email: </span><span style="font-size:12.0pt; color:black"><a href="mailto:axp09171@vsc.edu" title="axp09171@vsc.edu">axp09171@vsc.edu</a></span><span style="font-size:10.0pt; font-family:"Tahoma",sans-serif; color:black"></span></p>
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<p class="x_x_MsoNormal"><b><span style="color:black">From:</span></b><span style="color:black"> gradsusr <gradsusr-bounces@gradsusr.org> on behalf of Jennifer M Adams <jadams21@gmu.edu><br>
<b>Sent:</b> Tuesday, April 12, 2022 7:31 AM<br>
<b>To:</b> (gradsusr@gradsusr.org) <gradsusr@gradsusr.org><br>
<b>Subject:</b> Re: [gradsusr] Plotting xcbar.gs Even When There is No Valid Data</span>
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<h4 style="background:white"><span style="color:red">This message is from an external sender. Please be careful when clicking on links and attachments.</span></h4>
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<p class="x_x_MsoNormal"><span style="font-size:12.0pt; color:black">The colorbar scripts generally run 'q shades' and then parse the output in the 'result' variable. I have worked around this by setting up a plot with the contour levels and colors I want,
then saving the output from 'q shades' in a script variable for later use:<br>
'q shades'<br>
_shdinfo = result<br>
<br>
Then I append a modified copy of the colorbar script as a function in my main drawing script that uses _shdinfo instead of running 'q shades' again.
</span></p>
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<p class="x_x_MsoNormal"><span style="font-size:12.0pt; color:black">--Jennifer</span></p>
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<p class="x_x_MsoNormal"><b><span style="color:black">From:</span></b><span style="color:black"> gradsusr <gradsusr-bounces@gradsusr.org> on behalf of Perry, Aaron <axp09171@alumni.northernvermont.edu><br>
<b>Sent:</b> Tuesday, April 12, 2022 4:29 AM<br>
<b>To:</b> (gradsusr@gradsusr.org) <gradsusr@gradsusr.org><br>
<b>Subject:</b> [gradsusr] Plotting xcbar.gs Even When There is No Valid Data</span>
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<p class="x_x_MsoNormal"><span style="font-size:12.0pt; color:black">Good Morning All,</span></p>
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<p class="x_x_MsoNormal"><span style="font-size:12.0pt; color:black">I am trying to figure out a way to plot xcbar.gs even when there is no valid data in the grid to plot.</span></p>
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<p class="x_x_MsoNormal"><span style="font-size:12.0pt; color:black">For instance, there is no GFS precipitation values in a certain domain, say the Northeastern US, for Forecast Hour 12. xcbar.gs says that there is no shading information and therefore, does
not plot a colorbar for that one frame. I want to have that precipitation colorbar plot for every frame regardless of if there is data in the grid or not.</span></p>
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<p class="x_x_MsoNormal"><span style="font-size:12.0pt; color:black">I've tried going into xcbar.gs to see if there is an override to plot regardless of valid data or not but, there doesn't appear to be.</span></p>
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<p class="x_x_MsoNormal"><span style="font-size:12.0pt; color:black">Any and all suggestions would be greatly appreciated.</span></p>
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<p class="x_x_MsoNormal" style="background:white"><b><span style="font-size:14.0pt; color:#006FC9">Aaron Perry</span></b><span style="font-size:10.0pt; font-family:"Tahoma",sans-serif; color:black"></span></p>
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<p class="x_x_MsoNormal" style="background:white"><span style="font-size:12.0pt; color:#006FC9">Meteorologist<br>
Class of '16<br>
Northern Vermont University-Lyndon</span><span style="font-family:"Tahoma",sans-serif; color:black"></span></p>
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<p class="x_x_MsoNormal" style="background:white"><span style="font-size:10.0pt; color:#006FC9">(formerly Lyndon State College)</span><span style="font-size:12.0pt; color:#006FC9"><br>
Boston, Mass.</span><span style="font-size:10.0pt; font-family:"Tahoma",sans-serif; color:black"></span></p>
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<p class="x_x_MsoNormal" style="background:white"><span style="font-size:12.0pt; color:#006FC9">Email: </span><span style="font-size:12.0pt; color:black"><a href="mailto:axp09171@vsc.edu" title="axp09171@vsc.edu">axp09171@vsc.edu</a></span><span style="font-size:10.0pt; font-family:"Tahoma",sans-serif; color:black"></span></p>
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