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While Loop in R - r - learn r - r programming

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.

while loop

Syntax:

while (test_expression)
{
   statement
}

Syntax Explanation

test_expression is evaluated and the body of the loop is entered if the condition is TRUE. This process is repeated until test_expression evaluates to FALSE, in which case, the loop exits.

while-loop

Sample Code:

x <- 5
while(x< 10) 
{ 
    x <- x+ 1
    print(x)  
}

Code Explanation

while loop structure

x is specifying to string variable. Here x is initialized to value as 5.
The test_expression is x < 10 which evaluates to TRUE since 5 is less than 10.
In the next iteration, the value of incrementing x is 5 and the loop continues. This will continue until x takes the value 10. The condition 10 < 10 will give FALSE, and then loop is exits.
Here print() is used to print the value, that value stored in x variable.

Output

while loop output

Here in this output, the while loop will continue to run as long as x=5 is less than (x < 10) which will increase by 1 each time the loop runs (x+1) till 10.

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