CODEWITHSUNDEEP
rvectorextract
Silke
Silke

Reputation: 177

Extracting objects from table

I've worked with table(vector) to see what the frequency is of each element from my vector. But now I want to use the frequency of a number. I've tried the following code but it didn't work:

table(vector)[2]

Then I get for example 

7
2

So the number 7 attend 2 times in the vector. But I want to work with the "2", how do I do that?

Silke

Upvotes: 0

Views: 61

Answers (2)

Rohit Das
Rohit Das

Reputation: 2032

Lets say we have the following

vector <- sample(c(5:10),100,replace=T)
> table(vector)
vector
 5  6  7  8  9 10 
22 17 20 14 10 17

The first row is just the names and the bottom row is the values so if you do

x <- table(vector)
str(x)
 'table' int [1:6(1d)] 22 17 20 14 10 17
 - attr(*, "dimnames")=List of 1
  ..$ vector: chr [1:6] "5" "6" "7" "8" ...

you get the actual frequency values itself in a vector with names. Why are you not able to work with this? Can you give an example of the problem you are facing.

Upvotes: 0

agstudy
agstudy

Reputation: 121568

tt <- table(vector)

To get the frequency of "7" (column name here) , you can do this:

tt[["7"]]

You can also transform your table to a data.frame:

dat <- as.data.frame(tt)
dat[dat$Var1==7]$Freq

Upvotes: 2

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