alenaStar1k0va

All things Data Science & Big Data Analytics

  • For Loops [R,Python]

    for loops are dedicated to iterate though a specific number of things. Those things can be lists, vectors, etc. We can either set a specific number of iterations or have a loop go though a set list of something and perform a set operations on each element of the list. For example, we can go through a list of values and perform a specific operation such as adding/subtracting/dividing etc. or capitalizing each of the elements. Let’s see how thing can be done with R and Python: 

    [R]
values <- c(1,2,3,4,5)
# Let's create a for loop
for (i in values){
    print(i + 1)
}

[output]
[1] 2
[1] 3
[1] 4
[1] 5
[1] 6

# The output of the above for loop is a value with an added 1 to it. 
    [Python]
values = [1,2,3,4,5]

# Let's create a for loop
for i in values:
  print(i + 1)

[output]
2
3
4
5
6

  • While Loops [R,Python]

    In programming, loops allow us to perform repetitive actions without having to write repetitive code. Here are a few examples:

    [R]

# Let's declare and initialize a variable temp
temp <- 75
# Let's write a loop
while (temp > 65) {
    print(paste("The temperature is:",temp))
    if (temp > 80) {
        print("Too hot!")
        temp <- temp - 20
        print(paste("Temperature has been reset to:",temp))
    } else {
        print("Still too warm!")
        temp <- temp - 10
        print(paste("Temperature has been reset to:",temp)) 
    }
}

[output]
[1] "The temperature is: 75"
[1] "Still too warm!"
[1] "Temperature has been reset to: 65"
    [Python]

# Let's declare and initialize a variable temp
temp = 75

#Now, let's create a loop
while (temp > 65):
  print(f'The temperature is: {temp}')
  if (temp > 80):
    print("Too hot!")
    temp -= 20
    print(f'Temperature has been reset to {temp}')
  else:
    print("Still too warm!")
    temp -= 10
    print(f'Temperature has been reset to {temp}')

[output]
The temperature is: 75
Still too warm!
Temperature has been reset to 65