Selecting data frame rows based on partial string match in a column

Question

I want to select rows from a data frame based on partial match of a string in a column, e.g. column \'x\' contains the string "hsa". Using sqldf -

Answer 1

Another option would be to simply use grepl function:

df[grepl('er', df$name), ]
CO2[grepl('non', CO2$Treatment), ]

df <- data.frame(name = c('bob','robert','peter'),
                 id = c(1,2,3)
                 )

# name id
# 2 robert  2
# 3  peter  3