# Run a specific code block in R

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Run a specific code block in R, We will cover the basic syntax and definitions of the `switch`

function, as well as two examples of how to apply it.

**Definition and Basic R Syntax**

The `switch`

function in R runs a specific code block and returns its result. The basic syntax is:

switch(select_block, "code_block_1", "code_block_2", "code_block_3")

**Example 1: Basic Application of switch() Function**

In this example, we will demonstrate a simple application of the `switch`

function.

We have three code blocks that return the character strings “first”, “second”, and “third”.

We will use the `switch`

function to select one of these code blocks and return its result.

Let’s assume that we want to select the second code block. We can do this using the `switch`

function:

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switch(2, "first", "second", "third") # "second"

**Example 2: Using switch within a for-Loop**

We can also use the `switch`

function within a for-loop. Let’s assume that we have a vector that specifies several different code blocks that we want to run:

my_input <- c(3, 1, 2, 4, 1)

We can then use this vector to return the output of different code blocks:

for(i in 1:length(my_input)) { my_output <- switch(my_input[i], "first", "second", "third") print(my_output) } # [1] "third" # [1] "first" # [1] "second" # NULL # [1] "first"

Note that our input vector contained the value 4, but we have defined only three code blocks within the `switch`

function.

For that reason, the `switch`

statement returned NULL at the index position of the value 4.

**Conclusion**

In this tutorial, we have demonstrated how to apply the `switch`

statement in R.

We have covered two examples of how to use the `switch`

function, including a basic application and using it within a for-loop.

By using the `switch`

function, you can easily choose between different code blocks in your R programming code.

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