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1. R Switch Statement
2. R Select Case

In thistutorial you will learn about switch function in R programming withexamples. You will learn how to use switch() with text and integervalues.

Switchstatement is a selection structure which checks a value for equalityagainst a list of values. Each value in the list is called case. In Rthe behavior of switch varies, for integers it returns the respectiveindexed item however in case of text it executes the matchingcase.

Syntax of switch()

Generalsyntax of switch is

switch(value,case1, case2, case3,..)

If switchis used with a text value the syntax is

switch(value,

case 1:Code to be executed

case 3:Code to be executed

Executethis if no match

)

For aninteger value the syntax is

Example: switch() function

# switchfunction in R

R Switch Statement

num <- '3'

Simple tableadd a table to your website. switch(num,

'1'=print('One'),

'2' =print('Two'),

'3' =print('Three'),

'4' =print('Four'),

'5' =print('Five'),

'You didnot enter a number from 1 to 5:'

)

> [1] 'Three'

In thisexample num is a text variable. This variable is used in switchstatement. In case if the value of num matches '1' then the block ofcode print('One') will be executed. If num matches '2' then the secondline will be executed. In this case the value of num is '3' hence thethird line will be executed or 'Three' will be printed as output. Inthe end a default case is given, which is executed if there is nomatch.

Nextexample is for integer values.

x <-4

switch(x,'Apple', 'Mango', 'Guava', 'Orange', 'Pear')

>[1] 'Orange'

In this example a numeric value is testedfor a match against a list ofvalues. If the value is entered is a number that item of list isreturned. In case of a no match, NULL is returned.

x <-9

Word equivalent for mac. val <-switch(x, 'Apple', 'Mango', 'Guava', 'Orange', 'Pear')

print(val)

R Select Case

>[1] NULL