Loop in r - r - learn r - r programming
- A loop is a way to repeat a sequence of instructions under certain conditions.
- They allow we to automate parts of our code that are in need of repetition.
- In R Programming, we have to follow three conditional loops:
- For Loop
- While Loop
- Repeated loop
For Loop:
- In R programming, a for loop is used to iterate over a vectors.
- A for loop is a repetition control structure that permits we to efficiently write a loop that wants to execute an exact number of times.
Syntax:
for (value in vector)
{
statements
}
While Loop:
- In R programming, while loops are used to loop until a specific condition is satisfied.
- These is similar to for loop, but the iterations are controlled by a conditional statement.
Syntax:
while (test_expression)
{
statement
}
Repeat Loop:
- In general, the Repeat loop executes the same condition many times until a stop condition is satisfied.
- A repeat loop is used to iterate over a block of code multiple number of times.
Repeat Loop: Syntax:
repeat
{
commands
if(condition)
{
break
}
}
Loop Control Statements in R programming:
- Loop control statements modification execution from its standard sequence.
- once execution leaves a scope, all automatic objects that were created there in scope area unit destroyed.
- R supports the following two control statements such as,
- Break Statement
- Next statement
Break Statement:
- A break statement is used inside a loop to stop the iterations and flow the control external of the loop.
- In a nested looping situation, where there is a loop inside another loop, this statement exits from the innermost loop that is being evaluated.
- It can be used to terminate a case in the switch statement.
Syntax:
break
Next Statement:
- A next statement is useful when we want to skip the current iteration of a loop without terminating it.
- On come across next, the R parser skips additional evaluation and starts next iteration of the loop.
Syntax:
next