(R Tutorials for Citizen Data Scientist)
Beginners tutorial with R – Loops
There may be a situation when you need to execute a block of code several number of times. In general, statements are executed sequentially. The first statement in a function is executed first, followed by the second, and so on.
Programming languages provide various control structures that allow for more complicated execution paths.
A loop statement allows us to execute a statement or group of statements multiple times and the following is the general form of a loop statement in most of the programming languages −
R programming language provides the following kinds of loop to handle looping requirements. Click the following links to check their detail.
| Sr.No. | Loop Type & Description |
|---|---|
| 1 | repeat loopExecutes a sequence of statements multiple times and abbreviates the code that manages the loop variable. |
| 2 | while loopRepeats a statement or group of statements while a given condition is true. It tests the condition before executing the loop body. |
| 3 | for loopLike a while statement, except that it tests the condition at the end of the loop body. |
Loop Control Statements
Loop control statements change execution from its normal sequence. When execution leaves a scope, all automatic objects that were created in that scope are destroyed.
R supports the following control statements. Click the following links to check their detail.
| Sr.No. | Control Statement & Description |
|---|---|
| 1 | break statementTerminates the loop statement and transfers execution to the statement immediately following the loop. |
| 2 | Next statementThe next statement simulates the behavior of R switch. |
Beginners tutorial with R – Loops
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