R Programming - Convert Soil pH Levels to ordered Factors

R Programming: Factors Exercise-5 with Solution

Write a R program to convert a given pH levels of soil to an ordered factor.

Note: Soil pH is a measure of the acidity or basicity of a soil. pH is defined as the negative logarithm of the activity of hydronium ions in a solution.
In soils, it is measured in a slurry of soil mixed with water, and normally falls between 3 and 10, with 7 being neutral.

Sample Solution :

R Programming Code :

# Create a vector with soil pH levels
ph = c(1,3,10,7,5,4,3,7,8,7,5,3,10,10,7)

# Print a message indicating that the following output is the original data
print("Original data:")

# Print the original vector of pH levels
print(ph)

# Convert the pH levels to an ordered factor with specified levels
ph_f = factor(ph, levels=c(3,7,10), ordered=TRUE)

# Print a message indicating that the following output is the ordered factor
print("pH levels of soil to an ordered factor:")

# Print the ordered factor version of the pH levels
print(ph_f)

Output:

[1] "Original data:"
 [1]  1  3 10  7  5  4  3  7  8  7  5  3 10 10  7
[1] "pH levels of soil to an ordered factor:"
 [1] <NA> 3    10   7    <NA> <NA> 3    7    <NA> 7    <NA> 3    10   10   7   
Levels: 3 < 7 < 10                         

Explanation:

• Create a vector ph:
• ph = c(1,3,10,7,5,4,3,7,8,7,5,3,10,10,7)
• Defines a vector containing various pH levels of soil.
• Print original data:
• print("Original data:")
• Outputs a message indicating that the next output will display the original pH data.
• print(ph)
• Displays the vector of pH levels.
• Convert to an ordered factor:
• ph_f = factor(ph, levels=c(3,7,10), ordered=TRUE)
• Converts the ph vector into an ordered factor with specified levels (3, 7, and 10).
• ordered=TRUE ensures that the factor levels have a specific order (3 < 7 < 10).
• Print ordered factor:
• print("pH levels of soil to an ordered factor:")
• Outputs a message indicating that the next output will display the pH levels as an ordered factor.
• print(ph_f)
• Displays the pH levels as an ordered factor with the specified order of levels.

R Programming Code Editor:

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