<div dir="ltr">Sorry, I had some superfluous comments in my last. Stephen</div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, Mar 21, 2019 at 1:41 PM Stephen McMillan <<a href="mailto:smcmillan@planalytics.com">smcmillan@planalytics.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 dir="ltr"><div dir="ltr"><div>Arlindo,</div><div><br></div><div>I have found if_() is particularly useful when any part of the field is undefined (-u), since if() will not work with undefined values. That is well documented in <a href="http://cola.gmu.edu/grads/gadoc/gradfuncif.html" target="_blank">http://cola.gmu.edu/grads/gadoc/gradfuncif.html</a>.<br></div><div><br></div><div>I will use if() when I can but will continue to use if_() when undefined is involved, as is frequently the case. Thanks for keeping that function in opengrads.</div><div><br></div><div>Stephen Mc</div><div><br></div><div>where dt has values >= 0 along with missing values (-u)</div><div><br></div><div>So, it appears that undefined grid values must be changed to a "defined" value representing an undefined value, before one can use the if function on such fields.</div><div><br></div><div>Inter</div></div></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Wed, Mar 20, 2019 at 11:38 PM Arlindo da Silva <<a href="mailto:dasilva@alum.mit.edu" target="_blank">dasilva@alum.mit.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 dir="ltr"><div dir="ltr"><div class="gmail_default" style="font-size:large"><span style="font-size:small">On Fri, Mar 15, 2019 at 9:14 AM Stephen McMillan <<a href="mailto:smcmillan@planalytics.com" target="_blank">smcmillan@planalytics.com</a>> wrote:</span><br></div></div><div class="gmail_quote"><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 dir="ltr">Marian,<div>You are correct, regarding the "if" function in your version of OpenGrADS. The syntax I provided was for the latest (2.2.1) version. In the latest OpenGrADS version, you can either use "if" with the syntax as I provided, or use "if_" with the syntax you provided. Either way, you're good to go!</div><div><br></div></div></div></blockquote><div><br></div><div><div class="gmail_default" style="font-size:large">This is a subtle point. OpenGrADS has included an if() function for many years. Recently, COLA introduced an if() function, but unfortunately with a different syntax so it broke the code of people that had been using the OpenGrADS version. In 2.2.1 I renamed the OpenGrADS version if_() so they two can co-exist, although I strongly recommend that everyone migrate to the COLA version.</div><br></div><div><div class="gmail_default" style="font-size:large"> Arlindo</div><br></div><div><br></div><div><br></div><div> </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 dir="ltr"><div></div><div>Best wishes--</div><div>Stephen</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, Mar 14, 2019 at 10:53 PM AMS EmsiWx Bytča <<a href="mailto:emsiwx@pocasie-bytca.sk" target="_blank">emsiwx@pocasie-bytca.sk</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 bgcolor="#FFFFFF">
<p>Once again thank you both guys, gave up const/maskout after
sveral hours combining :D , used IF (did not know that it is
already in 2.1.x version which I have), the correct syntax is:<br>
</p>
<p><br>
</p>
<p>'define A=if(tempdif,>,25,0,if(tempdif,>=,22,2,6))'</p>
<p><br>
</p>
<p>Marian</p>
<p><br>
</p>
<p><br>
</p>
<div class="gmail-m_5296192303080297337gmail-m_-2444167908894083680gmail-m_3790593821196822103gmail-m_1754790531933285173moz-cite-prefix">Dňa 14. 3. 2019 o 20:04 AMS EmsiWx
Bytča napísal(a):<br>
</div>
<blockquote type="cite">
<p>Thank you Jeff and Stephen, will try to play with const/maskout
first, then I will reinstall my Opengrads and try the if
statement.</p>
<p><br>
</p>
<p>Marian<br>
</p>
<div class="gmail-m_5296192303080297337gmail-m_-2444167908894083680gmail-m_3790593821196822103gmail-m_1754790531933285173moz-cite-prefix">Dňa 14. 3. 2019 o 15:09 Stephen
McMillan napísal(a):<br>
</div>
<blockquote type="cite">
<div dir="ltr">Marian,
<div><br>
</div>
<div>One correction to what I sent...</div>
<div><br>
</div>
<div>'define A=if(dt>25,0,if(dt>=22,2,6))' added the
second )</div>
<div><br>
</div>
<div>Stephen</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Thu, Mar 14, 2019 at
10:06 AM Stephen McMillan <<a href="mailto:smcmillan@planalytics.com" target="_blank">smcmillan@planalytics.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">Marian,
<div><br>
</div>
<div>If you have the latest version of GrADS or OpenGrADS,
you could do something like this:</div>
<div><br>
</div>
<div>'define dt=t850-t500'</div>
<div>'define A=if(dt>25,0,if(dt>=22,2,6)'</div>
<div>'d A'</div>
<div><br>
</div>
<div>Stephen McMillan</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Wed, Mar 13, 2019 at
4:14 PM AMS EmsiWx Bytča <<a href="mailto:emsiwx@pocasie-bytca.sk" target="_blank">emsiwx@pocasie-bytca.sk</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">Dear all,<br>
<br>
<br>
I am going crazy combining const/maskout to get what I
need.<br>
<br>
I need to set A according the following:<br>
<br>
A= 0 when T850-T500 >25<br>
<br>
A= 2 when T850-T500 22-25<br>
<br>
A= 6 when T850-T500 <22<br>
<br>
<br>
Would like to ask any master of const/maskout for help.<br>
<br>
<br>
Thank you very much in advance.<br>
<br>
<br>
Marian<br>
<br>
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</blockquote></div><br clear="all"><div><br></div>-- <br><div dir="ltr" class="gmail-m_5296192303080297337gmail-m_-2444167908894083680gmail_signature"><font face="'comic sans ms', sans-serif" size="6" color="#006600"><span style="font-family:Helvetica;font-size:12px"></span><span></span><span></span>Arlindo da Silva</font><br><font size="4"><i><a href="mailto:dasilva@alum.mit.edu" target="_blank">dasilva@alum.mit.edu</a></i></font></div></div>
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