R Programming: Create an Ordered Factor from Month names

R Programming: Factors Exercise-3 with Solution

Write a R program to create an ordered factor from data consisting of the names of months.

Sample Solution :

R Programming Code :

# Create a vector of month names
mons_v = c("March","April","January","November","January",
"September","October","September","November","August","February",
"January","November","November","February","May","August","February",
"July","December","August","August","September","November","September",
"February","April")

# Print the original vector of month names
print("Original vector:")
print(mons_v)

# Convert the month names into a factor (unordered by default)
f = factor(mons_v)

# Print the ordered factors of the month names
print("Ordered factors of the said vector:")
print(f)

# Print the frequency table of the factors
print(table(f))

Output:

[1] "Original vector:"
 [1] "March"     "April"     "January"   "November"  "January"   "September"
 [7] "October"   "September" "November"  "August"    "February"  "January"  
[13] "November"  "November"  "February"  "May"       "August"    "February" 
[19] "July"      "December"  "August"    "August"    "September" "November" 
[25] "September" "February"  "April"    
[1] "Ordered factors of the said vector:"
 [1] March     April     January   November  January   September October  
 [8] September November  August    February  January   November  November 
[15] February  May       August    February  July      December  August   
[22] August    September November  September February  April    
11 Levels: April August December February January July March May ... September
f
    April    August  December  February   January      July     March       May 
        2         4         1         4         3         1         1         1 
 November   October September 
        5         1         4                         

Explanation:

• mons_v = c(...): Creates a character vector mons_v containing the names of months.
• print("Original vector:"): Displays the label "Original vector:".
• print(mons_v): Prints the contents of the mons_v vector, showing the month names.
• f = factor(mons_v): Converts the vector mons_v into a factor f. A factor is a data structure used to categorize the data and store it as levels.
• print("Ordered factors of the said vector:"): Prints the label "Ordered factors of the said vector:".
• print(f): Displays the factor f, showing the unique levels of the months.
• print(table(f)): Displays a frequency table of the levels in the factor f, showing how many times each month appears in the vector.

R Programming Code Editor:

Have another way to solve this solution? Contribute your code (and comments) through Disqus.

Previous: Write a R program to change the first level of a factor with another level of a given factor.
Next: Write a R program to concatenate two given factor in a single factor.