<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=Windows-1252">
</head>
<body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;">
Ciao, Davide —
<div>From the doc page on variables: </div>
<div><br>
</div>
<div>"<b>An important note:</b> When you specify a dimension in grid units, GrADS always converts it to world coordinates. In general, this conversion is done using the scaling of the
<i>default file</i>. The only exception to this rule is when a grid coordinate (x, y, z, t, or e) is supplied within a
<code>dimexpr</code> as part of a variable specification. In the case of this special exception, the conversion is done using the scaling for the file that variable is to be taken from (i.e., file number
<code>file#</code>)."</div>
<br>
<div>So, an expression like </div>
<div><font face="Courier" style="font-size: 14px;"> ‘set dfile 1’</font></div>
<div><font face="Courier" style="font-size: 14px;"> ‘set e 1'</font></div>
<div><font face="Courier" style="font-size: 14px;"> ‘d temp.1-temp.2(e=2)’</font></div>
<div>should work if file #2 is the one with ensembles and file #1 has no E dimension. </div>
<div><br>
</div>
<div>Bye Bye ;-)</div>
<div>-Jennifer</div>
<div><br>
</div>
<div><br>
<div>
<div>On Mar 15, 2017, at 1:57 PM, Davide Sacchetti <<a href="mailto:davide.sacchetti@arpal.gov.it">davide.sacchetti@arpal.gov.it</a>> wrote:</div>
<br class="Apple-interchange-newline">
<blockquote type="cite">Dears, I'd like to define a variable from more than one expression, but<br>
I don't know how.<br>
<br>
I mean: I have different files with temperature (on the same grid), I<br>
could compare temp.1 vs temp.2 but I'd like to compare something like<br>
temp(e=1) vs temp(e=2) without writing a new ctl with ens dimension: <br>
I'd prefere to do it on the fly, as defining a variable, let's say<br>
tempdef that links to temp.1 for e=1 and temp.2 for e=2, but I don't<br>
know how to do it.<br>
Any ideas?<br>
<br>
Bye<br>
Davide<br>
<br>
_______________________________________________<br>
gradsusr mailing list<br>
<a href="mailto:gradsusr@gradsusr.org">gradsusr@gradsusr.org</a><br>
http://gradsusr.org/mailman/listinfo/gradsusr<br>
</blockquote>
</div>
<br>
<div apple-content-edited="true">
<div style="color: rgb(0, 0, 0); letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;">
<div style="color: rgb(0, 0, 0); letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;">
<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>
</div>
</div>
</div>
<br>
</div>
</body>
</html>