R Programming Lab - Bsc CS DA and BSC ML And AI -Bharathiar University - Program 4- Data Frames in R

 

B.Sc Computer Science  

R Programming - Lab  

Bharathiar University 

Program 4

Data Frames in R

Program 4- Write a R program to perform various operations in data frame

SOURCE CODE:

# R program for dataframe

# A vector which is a character vector

name = c("Ram", "Raja", "Rani")

# A vector which is a character vector

subject = c("R", "Python", "Java")

# A vector which is a numeric vector

mark = c(64, 72, 80)

df = data.frame(name, subject, mark)

print(df)

# Accessing first and second row

print("Accessing first and second row\n")

print(df[1:2, ])

# Accessing first and second column

print("Accessing first and second column\n")

print(df[, 1:2])

print("Before adding row\n")

print(df)

# Add a new row using rbind()

newDf = rbind(df, data.frame(name = "deepa",

                             subject = "C",

                             mark = 75

))

print("After Added a row\n")

print(newDf)

print("Before adding column\n")

print(df)

# Add a new column using cbind()

newDf = cbind(df, rank=c(3, 5, 1))

print("After Added a column\n")

print(newDf)

print("Before deleting the 3rd row and 2nd column\n")

print(df)

# delete the third row and the second column

newDF = df[-3, -2]

print("After Deleted the 3rd row and 2nd column\n")

print(newDF)

OUTPUT:

name subject mark 1 Ram R 64 2 Raja Python 72 3 Rani Java 80 [1] "Accessing first and second row\n" name subject mark 1 Ram R 64 2 Raja Python 72 [1] "Accessing first and second column\n" name subject 1 Ram R 2 Raja Python 3 Rani Java [1] "Before adding row\n" name subject mark 1 Ram R 64 2 Raja Python 72 3 Rani Java 80 [1] "After Added a row\n" name subject mark 1 Ram R 64 2 Raja Python 72 3 Rani Java 80 4 deepa C 75 [1] "Before adding column\n" name subject mark 1 Ram R 64 2 Raja Python 72 3 Rani Java 80 [1] "After Added a column\n" name subject mark rank 1 Ram R 64 3 2 Raja Python 72 5 3 Rani Java 80 1 [1] "Before deleting the 3rd row and 2nd column\n" name subject mark 1 Ram R 64 2 Raja Python 72 3 Rani Java 80 [1] "After Deleted the 3rd row and 2nd column\n" name mark 1 Ram 64 2 Raja 72