grepFn {sos} | R Documentation |
Search for pattern
in a column
of a matrix or
data.frame using grep
. If value
= TRUE (the default),
return the selected subset of x
.
grepFn(pattern, x, column='Function', ignore.case=FALSE, perl=FALSE, value=TRUE, fixed=FALSE, useBytes=FALSE, invert=FALSE)
x |
a matrix or data.frame containing a column named column .
|
pattern, ignore.case, perl, fixed, useBytes, invert |
as for grep
|
column |
character string giving the column of x in which to search
for pattern .
|
value |
logical: If TRUE, return the selected subset of x . If
FALSE, return the row numbers returned by grep .
|
1. g <- grep(pattern, x[, column])
2. if(value)return(x[g, ]) else return(g)
If(value) return an object of the same class as x
containing
those rows of x
with x[, column]
matching
pattern
.
Else, return an integer vector identifying the rows of x
with
x[, column]
matching pattern
.
Spencer Graves, Sundar Dorai-Raj
z <- cbind(a=1:2, Function=c('s', 'spline')) z. <- grepFn("spline", z) all.equal(z., z[2,,drop=FALSE])