Hi,
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You could use the XML package to modify the attributes of a given node.
> library(XML)
# make an reproducible example
> z <- newXMLNode("BLABLA",
+ attrs = c(version = "XXX"),
+ .children = list(
+ newXMLNode("A1",
+ attrs = c(X1=2, X2="0", X3 = "100")),
+ newXMLNode("A2",
+ attrs = c(X1=133.708, X2=36.28558)),
+ newXMLNode("A3",
+ attrs = c(X1=1, X2 = 2, X3 = 3, X4 = 4))
+ ))
> z
<BLABLA version="XXX">
<A1 X1="2" X2="0" X3="100"/>
<A2 X1="133.708" X2="36.28558"/>
<A3 X1="1" X2="2" X3="3" X4="4"/>
</BLABLA>
# XML child nodes can be access using like a list
# z[['A1']] will extract the first node with that name
# then use the XML::xmlAttrs() function to get and set the attributes
> a1_atts <- xmlAttrs(z[["A1"]])
> a1_atts
X1 X2 X3
"2" "0" "100"
> a1_atts[['X3']] <- "boo"
> xmlAttrs(z[["A1"]]) <- a1_atts
> z
<BLABLA version="XXX">
<A1 X1="2" X2="0" X3="boo"/>
<A2 X1="133.708" X2="36.28558"/>
<A3 X1="1" X2="2" X3="3" X4="4"/>
</BLABLA>
Is that what you want to do?
Cheers,
Ben
On Aug 13, 2015, at 8:51 AM, Robert U <tacsun...@yahoo.fr> wrote:
> Dear RUser,I’m tryingto operate some very slight editing to the values of an
> XML file. I looked abit everywhere and it appears that dealing with XML files
> is not that easy… besidemy XML files might be a bit weirdly structured.
> Anyway, let me give you an exampleof it :
> Root(xmlfile)<BLABLA version="XXX"> <A1 X1="2" X2="0"X3="100"> <A2
> X1="133.708" X2="36.28558"/> <A3 X1="0" X2="0" X3="0" X4="0"/> <A4
> mode="0"/> … ……… </ A1 ></ BLABLA > I’d like to modify the value of
> say,X1 in A1 line, or X1 in A2 line. Unfortunately the structure of this
> datasetdoes not really look like the examples I’ve seen on the internet,
> where youhave something that look like that : <A1> something to change </A1>
> In my case as you noticed, thevalues I want to edit are inside de <>, which
> is pretty odd… Any tips? Regards
> [[alternative HTML version deleted]]
>
> ______________________________________________
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> and provide commented, minimal, self-contained, reproducible code.
Ben Tupper
Bigelow Laboratory for Ocean Sciences
60 Bigelow Drive, P.O. Box 380
East Boothbay, Maine 04544
http://www.bigelow.org
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