data.set manipulation  R Documentation 
Like data frames, data.set
objects have
subset
, unique
,
cbind
, rbind
,
merge
methods defined for them.
The semantics are basically the same as the methods defined
for data frames in the base
package, with the only difference
that the return values are data.set
objects.
In fact, the methods described here are frontends to the
corresponding methods for data frames, which are constructed
such that the "extra" information attached to variables within
data.set
objects, that is, to item
objects.
## S3 method for class 'data.set'
subset(x, subset, select, drop = FALSE, ...)
## S4 method for signature 'data.set'
unique(x, incomparables = FALSE, ...)
## S3 method for class 'data.set'
cbind(..., deparse.level = 1)
## S3 method for class 'data.set'
rbind(..., deparse.level = 1)
## S4 method for signature 'data.set,data.set'
merge(x,y, ...)
## S4 method for signature 'data.set,data.frame'
merge(x,y, ...)
## S4 method for signature 'data.frame,data.set'
merge(x,y, ...)
x,y 

subset 
a logical expression, used to select observations from the data set. 
select 
a vector with variablen names, which are retained in the data subset. 
drop 
logical; if 
... 
for 
incomparables 
a vector of values that cannot be compared. See

deparse.level 
an argument retained for
reasons of compatibility of the default methods
of 
ds1 < data.set(
a = rep(1:3,5),
b = rep(1:5,each=3)
)
ds2 < data.set(
a = c(3:1,3,3),
b = 1:5
)
ds1 < within(ds1,{
description(a) < "Example variable 'a'"
description(b) < "Example variable 'b'"
})
ds2 < within(ds2,{
description(a) < "Example variable 'a'"
description(b) < "Example variable 'b'"
})
str(ds3 < rbind(ds1,ds2))
description(ds3)
ds3 < within(ds1,{
c < a
d < b
description(c) < "Copy of variable 'a'"
description(d) < "Copy of variable 'b'"
rm(a,b)
})
str(ds4 < cbind(ds1,ds3))
description(ds4)
ds5 < data.set(
c = 1:3,
d = c(1,1,2)
)
ds5 < within(ds5,{
description(c) < "Example variable 'c'"
description(d) < "Example variable 'd'"
})
str(ds6 < merge(ds1,ds5,by.x="a",by.y="c"))
# Note that the attributes of the lefthand variables
# have priority.
description(ds6)
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