Apologies for bringing up an old topic, but I am not finding working answers. I am also an R newbie, so I'm still on the steep part of the learning curve. I have a character string : "0.5 1 2 3 4" I need to convert it to a vector of numbers. I get as far as strsplit(), which gives me "0.5" "1" "2" "3" "4" this is still treated by R as a single item. I need to get it to look like this: "0.5", "1", "2", "3", "4" so that I can use as.numeric() and make it into a vector of numbers... I have been going mad because for text operations, commas and quotes are loaded with meaning, and I keep going around in circles. Any help would be appreciated Thanks Paul -- View this message in context: http://r.789695.n4.nabble.com/Converting-charter-string-to-vector-of-numbers-tp4705097.html Sent from the R help mailing list archive at Nabble.com.
No, you don't need the commas. All data in R are vectors, and as.numeric
handles vectors just fine.
Keep in mind that what you see on the console is not necessarily what is in
memory... the syntax you see or use to input data is just that... a tool for
helping you communicate. For example, there are no actual quote marks around
character strings in memory either, but they get printed to help us understand
that they are character strings. Once you are referring to these values with
variables they just work under the hood.
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On March 25, 2015 10:27:40 AM PDT, Turgidson <epw at upenn.edu>
wrote:>Apologies for bringing up an old topic, but I am not finding working
>answers.
>I am also an R newbie, so I'm still on the steep part of the learning
>curve.
>
>I have a character string : "0.5 1 2 3 4"
>
>I need to convert it to a vector of numbers. I get as far as
>strsplit(),
>which gives me
>
> "0.5" "1" "2" "3" "4"
>
>this is still treated by R as a single item. I need to get it to look
>like
>this: "0.5", "1", "2", "3",
"4"
>
>so that I can use as.numeric() and make it into a vector of numbers...
> I
>have been going mad because for text operations, commas and quotes are
>loaded with meaning, and I keep going around in circles.
>
>Any help would be appreciated
>
>Thanks
>
>Paul
>
>
>
>
>
>--
>View this message in context:
>http://r.789695.n4.nabble.com/Converting-charter-string-to-vector-of-numbers-tp4705097.html
>Sent from the R help mailing list archive at Nabble.com.
>
>______________________________________________
>R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see
>https://stat.ethz.ch/mailman/listinfo/r-help
>PLEASE do read the posting guide
>http://www.R-project.org/posting-guide.html
>and provide commented, minimal, self-contained, reproducible code.
On Mar 25, 2015, at 10:27 AM, Turgidson wrote:> Apologies for bringing up an old topic, but I am not finding working answers. > I am also an R newbie, so I'm still on the steep part of the learning curve. > > I have a character string : "0.5 1 2 3 4" > > I need to convert it to a vector of numbers.The releatively recent additon of teh text parameter to scan lets you do this: scan(text="0.5 1 2 3 4" ) #Read 5 items #[1] 0.5 1.0 2.0 3.0 4.0 And the values are of course assign()-able: num <- scan(text="0.5 1 2 3 4") #Read 5 items num #[1] 0.5 1.0 2.0 3.0 4.0 In the old days one needed to use textConnection() and one still needs to do so for readLines which does not use scan().> I get as far as strsplit(), > which gives me > > "0.5" "1" "2" "3" "4" > > this is still treated by R as a single item. I need to get it to look like > this: "0.5", "1", "2", "3", "4" > > so that I can use as.numeric() and make it into a vector of numbers... I > have been going mad because for text operations, commas and quotes are > loaded with meaning, and I keep going around in circles. > > Any help would be appreciated > > Thanks > > Paul > > > > > > -- > View this message in context: http://r.789695.n4.nabble.com/Converting-charter-string-to-vector-of-numbers-tp4705097.html > Sent from the R help mailing list archive at Nabble.com. > > ______________________________________________ > R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code.David Winsemius Alameda, CA, USA