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Class 15

Functions

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AGENDA

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Today’s Class …

  • Functions

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During Class …

  • Function and control structure activity

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Next Class …

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Overview

  • Often, when working on a project, you will find yourself doing the same thing over and over again
  • Functions allow you to automatic common tasks
  • If you are copy and pasting code more than twice, you might want to use a function

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Julia’s Examples

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Julia’s Examples

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Benefits of Functions

  • More organized, more understandable code
  • Less errors
  • Increased productivity over time (you can reuse functions and if you need to make a change you only need to make a change in one place)

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Parts of a function

A name

The arguments- The arguments are things that vary across calls

The body- The body is the code that’s repeated across all the calls.

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Parts of a function

name <- function(arguments)

{ body

}

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Function Example

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# function to add 2 numbers

add_num <- function(a,b)

{

  sum_result <- a+b

  return(sum_result)

  }

# calling add_num function

 sum = add_num(35,34)

#printing result

print(sum)