Introduction to Probability, Second Edition, 2nd Edition

B

R

B.1    Vectors

Command	What it does
c(1,1,0,2.7,3.1)	creates the vector $\left(1,1,0,2.7,3.1\right)$
1:100	creates the vector $\left(1,2,\dots ,100\right)$
(1:100)^3	creates the vector $\left(1^3,2^3,\dots ,100^3\right)$
rep(0,50)	creates the vector $\left(0,0,\dots ,0\right)$ of length $50$
seq(0,99,3)	creates the vector $\left(0,3,6,9,\dots ,99\right)$
v[5]	$5$th entry of vector $v$ (index starts at 1)
v[-5]	all but the $5$th entry of $v$
v[c(3,1,4)]	$3$rd, 1st, $4$th entries of vector $v$
v[v>2]	entries of $v$ that exceed 2
which(v>2)	indices of $v$ such that entry exceeds 2
which(v==7)	indices of $v$ such that entry equals $7$
min(v)	minimum of $v$
max(v)	maximum of $v$
which.max(v)	indices where $max\left(v\right)$ is achieved
sum(v)	sum of the entries in $v$
cumsum(v)	cumulative sums of the entries in $v$
prod(v)	product ...