Le 16/06/10 18:54, Andrej a écrit :
Thanks David for your fast reply, but now I realized tat "string" is
of type:
class(string)
[1] "jobjRef"
attr(,"package")
[1] "rJava"
so I get an error when i try with gsub or sub:
sub("^.+\\t(\\d+)\\n.+$", "\\1", string)
Error in as.character.default(x) :
no method for coercing this S4 class to a vector
"string" is a java object, you can get the character vector like this:
> string$toString()
but I bet there are other methods in the java class that would let you
access the information you are after without doing text demangling. Try
completion:
> string$<TAB>
replace <TAB> by the tab key, you should see the list of java methods
associated with the java class. you can also call .jmethods
> .jmethods( string )
Romain
I think that there should be trivial solution, but... Any further
idea?
Regards, Andrej
On Jun 16, 6:47 pm, David Winsemius<dwinsem...@comcast.net> wrote:
On Jun 16, 2010, at 12:04 PM, Andrej wrote:
Dear all,
I'm trying to filter out the "number of leaves" (it should be 1 in the
example below) from the following string:
string
[1] "Java-Object{J48 pruned tree\n------------------\n: 0 (15.0/3.0)\n
\nNumber of Leaves : \t1\n\nSize of the tree : \t1\n}"
Any idea how to do that as simple as possible? Thanks in advance for
any advice.
?sub # or ?gsub if you need more than one pattern matched (they are
on the same page).
This should find the first occurrence of digits following a tab
terminated by a line feed and then return only the digits:
string<- "Java-Object{J48 pruned tree\n------------------\n: 0
(15.0/3.0)\n \nNumber of Leaves : \t1\n\nSize of the tree : \t1\n}"
sub("^.+\\t(\\d+)\\n.+$", "\\1", string)
[1] "1"
The parens within the search pattern are matched to "\\1". Need to
double backslashed within patterns.
Regards, Andrej
--
David Winsemius, MD
West Hartford, CT
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Romain Francois
Professional R Enthusiast
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http://romainfrancois.blog.free.fr
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