exists finds objects lots of places! (PR#142)
oncley@ucar.edu
oncley@ucar.edu
Thu, 11 Mar 1999 17:34:36 +0100
Full_Name: Steve Oncley
Version: 0.63.3
OS: Redhat5.2 i386
Submission from: 128.117.80.159 (128.117.80.159)
"exists" finds object UP TO the position it is in
> search()
[1] ".GlobalEnv" "Autoloads" "package:base"
> exists("ls",1)
[1] TRUE
> exists("ls",2)
[1] TRUE
> exists("ls",3)
[1] TRUE
> x <- 1
> exists("x",1)
[1] TRUE
> exists("x",2)
[1] FALSE
> exists("x",3)
[1] FALSE
whereas, S+ only finds the one position where the object is:
> search()
[1] ".Data"
[2] "/net/aster/splus3.4/local/.Data"
[3] "/net/aster/splus3.4/splus/.Functions"
[4] "/net/aster/splus3.4/stat/.Functions"
[5] "/net/aster/splus3.4/s/.Functions"
[6] "/net/aster/splus3.4/s/.Datasets"
[7] "/net/aster/splus3.4/stat/.Datasets"
[8] "/net/aster/splus3.4/splus/.Datasets"
[9] "/net/aster/splus3.4/library/Matrix/.Data"
[10] "/net/aster/splus3.4/library/trellis/.Data"
> exists("ls",1)
[1] F
> exists("ls",2)
[1] F
> exists("ls",3)
[1] F
> exists("ls",4)
[1] F
> exists("ls",5)
[1] T
> exists("ls",6)
[1] F
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