Re: [R] Can't get sample function from "An Introduction to R" to work

From: Spencer Graves <spencer.graves_at_pdf.com>
Date: Sat 16 Jul 2005 - 23:04:10 EST

          When you copied it into MS Word, did you "Copy -> "paste special" -> "unformatted text"? This trick sometimes might expose (or eliminate) nonprinting characters or characters with special attributes that might have created the problem.

          spencer graves

David Groos wrote:

> Thank you-all very much for your help, your responses and help has been
> very encouraging. The following doesn't close the case but it tables
> it...
>
> First I copied Ken's code into my R Console and...it worked great!
> That was baffling as it looked identical to mine.
>
> I did not explicitly say earlier that the code I sent out I had copied
> from the console, pasted into MS Word, changed font size, then pasted
> it into the e-mail--in other words, that was a copy of one of the codes
> that didn't work.
>
> Anyway, I then copied the non-working, pasted it into Console,
> expecting that it would say "Error: syntax error" upon pressing the
> return key at the end of this line:
>

>>>+ tst<-(yb1-yb2)/sqrt(s*(1/n1+1/n2))

>
> but it didn't! and the code worked this time, also!
> I then went about doing what I could to replicate the error from before
> and was as unsuccessful in doing that as I was in making it work,
> earlier.
>
>
> On Jul 15, 2005, at 4:43 PM, Peter Dalgaard wrote:
>
>
>>"Bret Collier" <bret@tamu.edu> writes:
>>
>>
>>>David,
>>>If below is exactly what you typed, check your code again, I think you
>>>are missing a '}' after the last 2 parentheses.
>>
>>That's not supposed to cause a syntax error, just another '+'.

>
> (right! that's what I thought...)
>
>>I can copy and paste the code as written and not get an error:
>>
>>
>>>twosam<-function(y1, y2) {
>>
>>+ n1<-length(y1);n2 <-length(y2)
>>+ yb1<-mean(y1); yb2<-mean(y2)
>>+ s1<-var(y1);s2<-var(y2)
>>+ s<-((n1-1)*s1 + (n2-1)*s2)/(n1+n2-2)
>>+ tst<-(yb1-yb2)/sqrt(s*(1/n1+1/n2))
>>+ }
>>
>>Perhaps this was the 1st time David got his typing right? The error is
>>of the sort you'd get if you had
>>
>> s<-((n1-1)*s1 + (n2-1)*s2/(n1+n2-2)

>
> Interestingly enough, I did try this line when first I was trying to
> make the code work and with just 1 ")" at the end I didn't get the
> error message, but then again I wasn't able to make the whole program
> work, either.
>
> In conclusion, I can't explain why it didn't first work time nor why I
> couldn't replicate the error. I think I ought to e-mail the Mac R
> folks about this.
>
> Again, Thanks,
>
> -David
>
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Spencer Graves, PhD
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Received on Sat Jul 16 23:09:05 2005

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