Michel- Rob Harris at INCO pointed out a flaw in my logic (see below). Lorraine- I didn't know about the UXDetect profile picker. I'd probably find some good use for it as a general feature.
-Jeff At 11:32 AM 1/8/02 , you wrote: >I think it would have to be: > >new=ch1; >new=(ch2>new)?ch2:new; >new=(ch3>new)?ch3:new; >etc. > >I'm not sure if you can use "new" in the expression like that, so you might >need another channel or variable. > > ---------- > From: Jeff Gamey [SMTP:[EMAIL PROTECTED]] > Sent: Tuesday, January 08, 2002 10:14 AM > To: [EMAIL PROTECTED] > Subject: Re: [geonet]: Applying a math expression to data clusters > > Michel- > > How about this as a work around? > You run a sequence such as: > > new=ch1; > new=(ch2>ch1)?ch2:new; > new=(ch3>ch2)?ch3:new; > new=(ch4>ch3)?ch4:new; > > and then pick local peaks from the profile. I don't think there's a > > profile peak picker in Oasis, but you can build a simple one using >lags. > > "new_m1" is "new" with a -1 lag > "new_p1" is "new" with a +1 lag > > final=(new>new_m1)&(new>new_p1)?new:dummy; > > I'm not sure I've got the "&" format right, but you get the idea. > > An messier alternative would be to assign XY values (X=fid, Y=ch#) >to each > data point, grid them, then use the grid peak picker. > > Good luck. > > -Jeff > > At 06:31 PM 1/7/02 , you wrote: > >I need to isolate a single point within each cluster of data points > >distributed over several channels. There are multiple clusters of >data > >throughout the survey. > > > >ie. Channel_1 Channel_2 Channel_3 Channel_4 > >New_Channel > > * * * * > >* > > * * * * > >* > > * * * * > >* > > 8.5 7.2 7.3 7.2 > >* > > 9.5 7.3 6.3 7.1 > >* > > 18.5 17.2 16.3 17.1 > >* > > 28.5 37.2 26.3 15.1 > >37.2 > > 8.9 7.9 6.3 7.1 > >* > > * * * * > >* > > * * * * > >* > > * * * * > >* > > > >Do you have an example of an expression that would achieve the >result above? > >In this case the > >highest value has been picked and placed into "new_channel". > > > >Michel Godbout > >Condor Consulting Inc. > >www.condorconsult.com > >(303) 423-8475 (303) 423-9729 fax > >mailto:[EMAIL PROTECTED] > > > > > > > > > > > > > >_______________________________________________________ > >More mailing list info >http://www.geosoft.com/support/listserv/index.html > > ********************** > * Jeff Gamey (4tj) > * Environmental Sciences Division [EMAIL PROTECTED] > * Oak Ridge National Laboratory (865) 574-6316 tel > * POBox 2008, Bldg 1505, MS6038 (865) 576-8646 fax > * Bethel Valley Rd., Oak Ridge, TN (865) 599-0820 cell > * 37831-6038 > > _______________________________________________________ > More mailing list info >http://www.geosoft.com/support/listserv/index.html ********************** * Jeff Gamey (4tj) * Environmental Sciences Division [EMAIL PROTECTED] * Oak Ridge National Laboratory (865) 574-6316 tel * POBox 2008, Bldg 1505, MS6038 (865) 576-8646 fax * Bethel Valley Rd., Oak Ridge, TN (865) 599-0820 cell * 37831-6038 _______________________________________________________ More mailing list info http://www.geosoft.com/support/listserv/index.html
