if else & for loop

if else

if ( condition ) {

command1

} else {

command2

}

if ( condition ) {

command1

} else if (cond) {

command2

} else if (cond) {

command3

} else command4

if ( x > 100 ) y=1 else y=0

if ( x > 100 ) { y=1 } else { y=0 }

if ( is.character(x) ) 1 else 5

for loop

for (i in 1:20) command

for (i in 1:length(x))

for (i in v) {

command1

command2

}