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I have a big contingency table, approximately of size 60*2*500*500, and I need to count the number of cells containing a count of 1 for each of the factors values defining the first dimension. Here is my attempt: tab1<-with(pisa1,table(CNT,GENDER,ISCOF,ISCOM)) tab2<-apply(tab1,1:4,function(x)ifelse(sum(x)==1,1,0)) tab3<-apply(tab2,1,sum) Computing tab2 is very slow. Is there a faster and/or more elegant way of doing this? -- Erich Neuwirth, University of Vienna Faculty of Computer Science Computer Supported Didactics Working Group Visit our Sun...

Well, things might be working. ?I have gotten the upsmon.conf set up so that when I unplugthe wall power I get a message. ?Have not yet tested that I get a system shutdown. ?That iscoming soon. ?? One more thing I would like to know, however, and that is this: ?When I get a shutdown, I doNOT want the system to restart when wall power returns (AC power in Costa Rica can bekind of flaky). ? If I did NOT set up any systemd service will I get the action as I want (ie norestart ), or...