R Program to convert given pH levels of soil to an ordered factor


February 25, 2023, Learn eTutorial
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How to convert given pH levels of soil to an ordered factor using the R program?

To convert a value to an ordered factor using the R program, we are using built-in functions levels(), and factor() for this conversion. The levels(), factor() functions in R compute the levels of factors of the vector in a single function.

Using the function factor() we can create a factor of the vector and by using the level() function we can find levels of a factor. Factors are stored as integer vectors and which is closely related to vectors. The syntax of these functions are 

levels(x) #where x is an object, for example, a factor
factor(x = character(), levels, labels = levels,exclude = NA, ordered = is.ordered(x), nmax = NA) 
#Where x is a vector of data, usually taking a small number of distinct values
 

In this R program, We are printing the original values to understand the values and then we directly give the values to built-in functions. And print the function result. Here we used variable PH for assigning ph values and variable PHF for finding the ordered factor value of the given ph values.

ALGORITHM

STEP 1: Assign variable PH with soil ph values

STEP 2: Display the original values

STEP 3:Call the built-in function factor with level as factor(PH, levels=c(3,7,10),ordered=TRUE)

STEP 4: Assign variable PHF with the function result

STEP 5: Print the ordered factor

R Source Code

                                          PH = c(1,3,10,7,5,4,3,7,8,7,5,3,10,10,7)
print("Original values of PH:")
print(PH)
PHF = factor(PH, levels=c(3,7,10),ordered=TRUE)
print("pH value to an ordered factor:")
print(PHF)
                                      

OUTPUT

[1] "Original values of PH:"
[1]  1  3 10  7  5  4  3  7  8  7  5  3 10 10  7
[1] "pH value to an ordered factor:"
[1]  3    10   7      3    7     7     3    10   10   7   
Levels: 3 < 7 < 10