R子集一个数据帧，不包括列中的某些值

Question

i have a data frame that has certain values ending in (SP1) or (SP2) along with other values that do not end with (SP1) or (SP2) . what i am trying to accomplish is to create a new data frame that contains only the values that do not end on (SP1) or (SP2)

i can subset the values containing (SP1) or (SP2) as below:

Loc.Z.End = subset(location.simple, grepl("(SP1)|(SP2)", location.simple$Location_Name))

i thought that adding the ! operator would do the trick as below but it does not!

Loc.Z.End = subset(location.simple, [!grepl("(SP1)|(SP2)", location.simple$Location_Name)])

but this does not do the trick! what am i doing wrong?

here is an exaple of the data

Location_Name City AMEM01 London BANY01 Leeds HSBC Dubai (SP1) Dubai Leeds(SP2) Leeds

Thanks for your help!

Answer 1

The argument that takes the grepl logical expression is subset and according to ?subset

subset - logical expression indicating elements or rows to keep: missing values are taken as false.

We don't need any []

subset(location.simple, !grepl("(SP1)|(SP2)", location.simple$Location_Name))
#  Location_Name   City
#1        AMEM01 London
#2        BANY01  Leeds