R Switch
R switch statement
R Switchhax
In this tutorial, we shall learn R switch statement based on index and matching value, its syntax and examples to demonstrate the realization of decision making using switch statement.
R switch statement provides decision making capability. It allows to select one of the cases based on the value of an expression.
There are two ways in which one of the cases is selected.
R is a programming language and software environment for statistical analysis, graphics representation and reporting. R was created by Ross Ihaka and Robert Gentleman at the University of Auckland, New Zealand, and is currently developed by the R Development Core Team. Package ‘MSwM’ July 16, 2018 Type Package Title Fitting Markov Switching Models Version 1.4 Date 2018-06-25 Author Josep A. Sanchez-Espigares, Alberto Lopez-Moreno.
- Based on Index – If the cases are just values (like a Character Vector), and if the expression is evaluated to a number, the expression’s result is used as index to select the case.
- Based on Matching Value – If the cases have both case value and output value like [“case_1″=”value1”], then the expression value is matched against case values. When there is a match with the case, the corresponding value is the output.
R Switch Case
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We shall see about these two ways in detail.
R switch statement – Based on Index
The syntax of Switch statement in R is
Example 1 – Switch in R
In this example, we will use switch statement based on index. The value of y, is taken as index.
Output
Example 2 – Switch Expression
In the following R switch statement, we used expression with multiple variables. The expression is evaluated to an integer and this integer is used as index to select one of the many values.
Output
R switch statement – Based on Matching Value
The syntax of switch statement based on matching value is
Example 3 – R Switch – Matching Value
In this example, we will write a switch statement that selects on of the many values by matching expression’s value with the cases.
Output
Example 4 – R Switch – Matching Value
In the following R switch statement, we used a string concatenation expression.
Output
Conclusion
In this R Tutorial, we have learnt R switch statement, its syntax and examples to demonstrate the realisation of decision making using switch statement.