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
