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R Introduction: Part I

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Variables

Saving and reusing data effectively in programming often requires the use of variables.

To ensure clear and error-free programming, certain rules must be followed when naming variables. Here are some guidelines:

  • Variable names must not start with a number or with a period followed by a number;

  • They should not include the % symbol;

  • They must not begin with an underscore _;

  • They can start with a period if it is not followed by a number.

Choosing meaningful variable names is considered best practice. For instance, naming a variable year to store the value 2020 is more intuitive than using nondescript names like a or b. While this isn't mandatory, it significantly enhances code readability for both the author and others.

To assign a value to a variable, the assignment operator = is used. For example, year = 2020 assigns the value 2020 to the variable named year:

year = 2020
cat(year)

              
12

            
year = 2020
cat(year)
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Regarding the deposit task, let's assign the relevant data to variables using the assignment operator:

  1. Assign the initial amount of money, 2000, to the variable named initial_money.
  2. Assign the interest rate, 13, to the variable named interest_rate.
  3. Assign the number of years, 4, to the variable named n_years.
  4. Use the cat() function to display the values of initial_money, interest_rate, and n_years in the order they were created.

Soluzione

# Create initial_money variable
initial_money = 2000
# Create interest_rate variable
interest_rate = 13
# Create n_years variable
n_years = 4
# Output variables' values
cat(initial_money, interest_rate, n_years)

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Sezione 1. Capitolo 8
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# Create initial_money variable
___
# Create interest_rate variable
___
# Create n_years variable
___
# Output variables' values
cat(___, ___, ___)

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