dear list: I made some corrections in the previous post that had some mistakes.
I need help to achieve a simpler code to complete a task I'm performing. here is an example: dat<-expand.grid(a=seq(1,4),b=seq(1001,1004)) #I want to add a new column dat$c in that: t1<-ifelse(dat$a==1&dat$b==1001,1001,0) t2<-ifelse(dat$a==2&dat$b==1002,1001,0) t3<-ifelse(dat$a==3&dat$b==1003,1001,0) t4<-ifelse(dat$a==4&dat$b==1004,1001,0) t5<-ifelse(dat$a==1&dat$b==1002,1002,0) t6<-ifelse(dat$a==2&dat$b==1003,1002,0) t7<-ifelse(dat$a==3&dat$b==1004,1002,0) t8<-ifelse(dat$a==1&dat$b==1003,1003,0) t9<-ifelse(dat$a==2&dat$b==1004,1003,0) t10<-ifelse(dat$a==1&dat$b==1004,1004,0) dat$c<-t1+t2+t3+t4+t5+t6+t7+t8+t9+t10 My real data frame is much larger... I hope someone can help me with this. thanks for your help a. diaz ------------------------------------------------- Email Enviado utilizando o serviço MegaMail
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