Question

I have a big data.frame. I have to count how many times a word ending with _xxsgt occurs, column by column.

  Col1             Col2  
  a               54_xxsgt   
  123_xxsgt       e     
  d               f  
  429_s_xxsgt     g 

Desired output:

Col1: 2 (123_xxsgt and 429_s_xxsgt occur)
Col2: 1 (54_xxsgt occur)
….

Answer 1

Try this:

> DF <- read.table(text=" Col1             Col2  
    a               54_xxsgt   
    123_xxsgt       e     
    d               f  
    429_s_xxsgt     g ", header=T)
> 
> apply(DF, 2, function(x) sum(grepl('_xxsgt', x)))
Col1 Col2 
   2    1