how to filter and reverse the values using vector

 

How to filtering vector values

 Filtering a vector means getting the values from the vector by removing the others, we can also say that getting the required elements is known as filtering.

Method 1: Using %in%

Here we can filter the elements in a vector by using the %in% operator

Syntax:

 vec[vec %in% c(elements)]

where

·         vec is the input vector

·         elements are the vector elements that we want to get

Example:  R program to filter the vector by getting only some values

 

# create a vector with id and names

vector=c(1,2,3,4,5,"sravan","boby","ojaswi","gnanesh","rohith")

 # display vector

print(vector)

 print("=======")

 # get the data  - "sravan","rohith",3 from

# the vector

print(vector[vector %in% c("sravan","rohith",3)])

 print("=======")

 # get the data  - "sravan","ojaswi",3,1,2 from

# the vector

print(vector[vector %in% c("sravan","ojaswi",3,1,2)])

 print("=======")

 # get the data  - 1,2,3,4,5 from the vector

print(vector[vector %in% c(1,2,3,4,5)])


Method 2: Using Index


We can also specify the condition from the index operator.
 

Syntax:

vector[condition(s)]

where the vector is the input vector and condition defines the condition to follow for filtering. 

Example: R program to filter vector using the conditions

# create a vector with id and names

vector=c(1,2,3,4,5,"sravan","boby","ojaswi","gnanesh","rohith")

 # display vector

print(vector)

 print("=======")

 # get the data where element not equal to 1

print(vector[vector != 1])

 print("=======")

 # get the data where element  equal to 1

print(vector[vector == 1])

How to reverse the order of given vector in R?


It can be done using the rev() function. It returns the reverse version of data objects.

Syntax: rev(x)

Parameter: x: Data object

Returns: Reverse of the data object passed 

# create vector with names

vec = c("sravan", "mohan", "sudheer",

         "radha", "vani", "mohan")

  print("Original vector-1:")

print(vec)

rv = rev(vec)

  print("The said vector in reverse order:")

print(rv)

 Example 2: Here we will create multiple vectors and then reverse them.

# create vector with names

name = c("sravan", "mohan", "sudheer",

         "radha", "vani", "mohan")

  # create vector with subjects

subjects = c(".net", "Python", "java", 

             "dbms", "os", "dbms")

  # create a vector with marks

marks = c(98, 97, 89, 90, 87, 90)

  # create vector with height

height = c(5.97, 6.11, 5.89,

           5.45, 5.78, 6.0)

  # create vector with weight

weight = c(67, 65, 78,  65, 81, 76)

  # pass these vectors to the vector

data = c(name, subjects, marks, height, weight)

# display

print("Original vector-1:")

print(data)

rv = rev(data)

  print("The said vector in reverse order:")

print(rv)

 


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