How to extract specific columns from a dataframe in R

Question

Hi Guys,

I am new in R. I have one data frame in R. I want to extract some specific columns from that data frame. How can I do that?

Answer 1

Hi@akhtar,

You can use the select method to extract any columns from a data frame. I have attached one example below for your reference.

> df
  IND snp1 snp2 snp3 snp4 snp5
1   1  A/G  T/T  T/C  G/C  G/G
2   2  A/A  C/C  G/G  G/G  A/A
3   3  T/T  G/G  C/C  C/C  T/T

This is a data frame that has six columns. Now to extract particular columns we can use the select method.

> select(df, snp1,snp3,snp4)
  snp1 snp3 snp4
1  A/G  T/C  G/C
2  A/A  G/G  G/G
3  T/T  C/C  C/C