Soluzione esercizi su Array - 1

1
Soluzione esercizi su Array - 1

• Array -------------------------
• Es.1
• gt m lt- matrix (runif(100), nrow10)
• gt m lt- matrix (runif(100), ncol10)
• gt m lt- array(runif(100), c(10,10))
• Es.2
• gt x lt- matrix (rep(c("T","A","C"),c(4,5,3)),
  nrow3)
• gt y lt- matrix (rep(c("A","G","C"),c(4,9,2)),
  nrow5)
• gt x,12 lt- t(y),45
• Es.3
• gt a lt-array(160, c(3,4,5))
• gt b lt-array(round(runif(60)9), c(3,4,5))
• gt c lt- ab
• gt v lt-160
• gt x lt- av si ottiene un array
• gt is.array(x)
• 1 TRUE
• gt dim(a) lt- c(3,5,2,2)
• gt attributes(a)

2
Soluzione esercizi su Array -2

• Array -------------------------
• Es.4
• gt M lt- matrix(120,ncol5)
• gt N lt- matrix(115,ncol5)
• gt MN lt- rbind(M,N)
• gt MN2 lt- cbind(M,N)
• Error in cbind(...) number of rows of matrices
  must match (see arg 2)
• Es.5
• gt A lt- matrix(runif(9),nrow3)
• gt B lt- matrix(runif(9),nrow3)
• gt Pel lt- AB
• gt P lt- AB
• gt b lt- runif(3)
• gt x lt- solve(A,b)

3
Soluzione esercizi sulle Liste -1

• Es.1
• lilt-list(matrix(116,nrow4),rep(NO",times32),"
  topo",list(110,TRUE))
• Es.2
• gt lim,2 opp. li1,2
• gt lislis"G"
• gt li3 lt- list(runif(10))
• Es.3
• gt li2 lt- list(15, matrix(14,nrow2),vc(TRUE,FAL
  SE))
• gt li3 lt- list(factor(rep(c("Q","T"),times3)),
  matrix(14,nrow2), vc(TRUE,FALSE))
• gt vect lt- c(li,li2,li3)
• gt is.vector(vect)
• 1 TRUE
• gt is.list(vect)
• 1 TRUE
• Es.4
• gt li2
• 1 "T" "T" "T" "G" "G" "G" "G" "G"
• gt lis
• 1 "T" "T" "T" "G" "G" "G" "G" "G"

4
Soluzione esercizi sulle Liste - 2

• Es.5
• gt diag(li1)
• 1 -0.7145504 1.2088036 0.5635183 0.5549922
  -0.5632107 -1.9878782 0.8712786 -0.3021831
• gt diag(li1)
• Error in as.integer.default(x) (list) object
  cannot be coerced to integer