Re: as.character problem

[Sundar Dorai-Raj <sundar.dorai-raj@pdf.com>]

Kyle,

I still cannot replicate this:

> z <- data.frame(x = rnorm(10), y = rnorm(10))
> x <- readline("Enter a formula:  ")
Enter a formula:  y ~ x
> x
[1] "y ~ x"
> lm(x, z)
Call:
lm(formula = x, data = z)

Coefficients:
 (Intercept)          x
  -0.4199697 -0.2295711

Degrees of freedom: 10 total; 8 residual
Residual standard error: 0.8161149
>
> version
Professional Edition Version 6.2.1  for Microsoft Windows : 2003
>

--sundar


Kyle Roberts wrote:
> Chuck and others,
>
> Here is an example of what I am trying to do - I want the user to enter
> in a formula into the readline command and then use that formula in a
> function later such that:
>
>
> > x <- readline("Enter a formula:  ")
> Enter a formula:  MATHACH~VISUAL+GENDER
>
> > x
> [1] "MATHACH~VISUAL+GENDER"
>
> But then when I try something like:
>
> > lm(x, data)
>
> I get the following error:
> 1 missing values generated coercing from character to numeric in:
> as.numeric(x)
>
> Any suggestions?????
>
> *****************************************************
> J. Kyle Roberts, Ph.D.
> Assistant Professor of Educational Research
> University of North Texas
> P.O.Box 311335
> Denton, TX   76203-1335
> voice - 940-369-7168
> fax - 940-565-2185
> kroberts@unt.edu
> *****************************************************
>
>
> > > > "Chuck Taylor" <chuck@insightful.com> 11/10/2004 3:51:09 PM >>>
> Kyle,
>
> I would be interested to see what you did to get that error message.  
> I tried to reproduce it, but I don't get that error.  And what does 
> this have to do with as.character()?
>
> > x <- readline("Enter a number:  ")
> Enter a number:  12.5
>
> > x
> [1] "12.5"
>
> > as.numeric(x)
> [1] 12.5
>
> > as.integer(x)
> [1] 12
>
> > x <- readline("Enter a number:  ")
> Enter a number:  abc
>
> > x
> [1] "abc"
>
> > as.numeric(x)
> [1] NA
> Warning messages:
>     1 missing values generated coercing from character to numeric in:
> as.numeric(x)
>
>
> --
> Chuck
>
> Chuck Taylor
> Sr. Quality Assurance Engineer
> Insightful Corporation
> Seattle, WA, USA
>  
>
> > -----Original Message-----
> > From: Kyle Roberts [mailto:kroberts@unt.edu] 
> > Sent: Wednesday, November 10, 2004 11:35 AM
> > To: s-news@lists.biostat.wustl.edu 
> > Subject: [S] as.character problem
> >
> > Dear All,
> >
> > I am trying to make a more user-friendly program and am using the
> > readline command to accept information from the user.  I then want
> to
>
> > use this information in a function, but keep getting an error
> message
>
> > saying "Invalid data for conversion from character to integer" when
> I
>
> > try and use their information from the readline command in another
> > function.  Is there a quick solution to this??
> >
> > Thanks,
> > Kyle
> >
> > *****************************************************
> > J. Kyle Roberts, Ph.D.
> > Assistant Professor of Educational Research
> > University of North Texas
> > P.O.Box 311335
> > Denton, TX   76203-1335
> > voice - 940-369-7168
> > fax - 940-565-2185
> > kroberts@unt.edu 
> > *****************************************************
> > --------------------------------------------------------------------
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