Re: [R] strsplit and sapply

From: Jonathan Baron <baron_at_psych.upenn.edu>
Date: Fri, 11 Apr 2008 07:26:22 -0400

Here is a command I wrote to get the part of the email address before the @ sign. It works, but I don't know why. The variable called email is a vector of email addresses (not yet in character form, so that is why I need "as character").

names(Score) <- sapply(email,function(x)  (strsplit(as.character(x),"@")[[1]]))[1,]

On 04/11/08 04:12, Dennis Fisher wrote:
> Colleagues,
>
> I have some text:
> TEXT <- c("a", "bb;ccc", "dddd;eeeee;ffffff")
>
> I want to retrieve the portion of each element before the first
> semicolon. I can split each element using strsplit:
>
> SPLIT <- strsplit(TEXT, ";")
>
> This yields:
> > SPLIT
> [[1]]
> [1] "a"
>
> [[2]]
> [1] "bb" "ccc"
>
> [[3]]
> [1] "dddd" "eeeee" "ffffff"
>
> Now I need to access the [1] portions of [[n]] - ("a", "bb",
> "dddd"). I suspect that sapply is the correct tool here but the
> syntax eludes me. Can anyone direct me to the correct syntax?
>
> Dennis
>
>
> Dennis Fisher MD
> P < (The "P Less Than" Company)
> Phone: 1-866-PLessThan (1-866-753-7784)
> Fax: 1-415-564-2220
> www.PLessThan.com
>
>
> [[alternative HTML version deleted]]
>
> ______________________________________________
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-- 
Jonathan Baron, Professor of Psychology, University of Pennsylvania
Home page: http://www.sas.upenn.edu/~baron
Editor: Judgment and Decision Making (http://journal.sjdm.org)

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Received on Fri 11 Apr 2008 - 11:41:26 GMT

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