**To**:**Andrew Wittenberg <atw@xxxxxxxxxxxxx>****Subject**:**RE: deepest depth****From**:**"Clement, Jaclyn USA" <jlclemen@xxxxxxxxxxxx>**- Date: Wed, 29 Jan 2003 12:08:30 -0800
- Cc: Ferret Users <ferret_users@xxxxxxxxxxxxxxxxxxx>
- Sender: owner-ferret_users@xxxxxxxxxxxxxxxxxxx
- Thread-index: AcLHKq6sdswDFs0PSK+ps7sXTPQNXQApUTGA
- Thread-topic: deepest depth

Hi Dr. Wittenberg and Ferreters, Thank you for your response. However, I am still having trouble getting the deepest depth. This is most likely due to my own inexperience with Ferret. When I tried the commands that you sent, I got an error message: **ERROR: command syntax: "," is illegal in 'temp,r=kend' I'm not sure how to fix the problem and again, it may be only my inexperience that is a problem. It is possible that I was supposed to insert something where you place a ' in the commands, but I'm not sure what. Also if you (or anyone else) could give me an explanation of the commands and what they are doing I would really appreciate it. Thanks, Jaclyn Clement -----Original Message----- From: Andrew Wittenberg [mailto:atw@gfdl.noaa.gov] Sent: Tuesday, January 28, 2003 4:10 PM To: Clement, Jaclyn USA Cc: Ferret Users Subject: Re: deepest depth On Tue, 28 Jan 2003, Clement, Jaclyn USA wrote: > I'm trying to shade a variable (e.g. temp) at the deepest depth (highest > k level) not including missing values. I've been able to define and > shade a variable (kmax) by using the following: let kmax3D = k[g=temp] + > 0*temp ! an XYZ field of K masked by bottom let kmax = > kmax3D[k=1:33@max] ! if 33 is number of vertical levels This variable > (kmax) correctly represents the deepest depth at each x,y data point, > but how do I tell Ferret to use kmax as the k when shading temp? Hi Jaclyn, The @WEQ ("weighted equal") transformation does the trick (see the User's Guide, Ch3 Sec2.4.27, Ex. 5): let kvals = k[g=temp] + 0*temp let kzero = kvals - kvals[k=1:`temp,r=kend`@max] let integrand = temp * kzero[k=@weq:0] let temp_bottom = integrand[k=1:`temp,r=kend`@sum] Andrew +--------------------------------------------------------+ | Dr. Andrew T. Wittenberg | GFDL/NOAA | | atw@gfdl.noaa.gov | Princeton, NJ | +--------------------------------------------------------+

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