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Soluzione esercizi su Vettori e Fattori

Soluzione esercizi su Vettori e Fattori. Vettori ------------------------- Es.3: > s<-rep(c("C","G","T","C"),times=3) > sub <- s[s!="C"] > sub[(length(sub)+1):(length(sub)+3)] <- NA > sub <- sub[!is.na(sub)] Es.5 > vet <- runif(100) > subvet <- vet[vet>0.2 & vet <0.6]

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Soluzione esercizi su Vettori e Fattori

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  1. Soluzione esercizi su Vettori e Fattori Vettori ------------------------- Es.3: > s<-rep(c("C","G","T","C"),times=3) > sub <- s[s!="C"] > sub[(length(sub)+1):(length(sub)+3)] <- NA > sub <- sub[!is.na(sub)] Es.5 > vet <- runif(100) > subvet <- vet[vet>0.2 & vet <0.6] > w <- subvet[seq(2,length(subvet),by=2)] > w <- (w-mean(w))/sd(w) Fattori ------------------ Es.1: > f <- factor( rep( c("Level1", "Level2","Level3"), c(10,10,5))) Es.2: of <- ordered( rep( c("Basso", "Medio","Alto"), c(5,5,5)), + levels = c("Basso", "Medio","Alto")) > mis <- runif(15); mis <- sort(mis) > tapply(mis,of,mean) Basso Medio Alto 0.1517416 0.5048905 0.7578302 > tapply(mis,of,sd) Basso Medio Alto 0.02882301 0.06776671 0.12875503

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