R help - Jul 2009 - how to evaluate character vector within pnorm()

Hi,

I'm trying to evaluate a character vector within pnorm. I have a vector 
with values and names

x = c(2,3)
names(x) = c("mean", "sd")

so that i tried the following

temp = paste(names(x), x, sep = "=")

#gives
#> temp
#[1] "mean=2" "sd=3"

#Problem is that both values 2 and 3 are taken as values for the mean 
argument in pnorm
pnorm(0, eval(parse(text = temp)) )

#but not as
pnorm(0, mean = 2, sd = 3 )


#How can i get

pnorm(0, eval(parse(text = temp)) )

#to do

pnorm(0, mean = 2, sd = 3 )



Thank you for your time

Thomas Roth

Dear Thomas,

You don't need parse()

X <- c(mean = 2, sd = 3)
pnorm(0, mean = X["mean"], sd = X["sd"])

Have a look at

library(fortunes)
fortune(106) 


HTH,

Thierry

------------------------------------------------------------------------
----
ir. Thierry Onkelinx
Instituut voor natuur- en bosonderzoek / Research Institute for Nature
and Forest
Cel biometrie, methodologie en kwaliteitszorg / Section biometrics,
methodology and quality assurance
Gaverstraat 4
9500 Geraardsbergen
Belgium
tel. + 32 54/436 185
Thierry.Onkelinx at inbo.be
www.inbo.be

To call in the statistician after the experiment is done may be no more
than asking him to perform a post-mortem examination: he may be able to
say what the experiment died of.
~ Sir Ronald Aylmer Fisher

The plural of anecdote is not data.
~ Roger Brinner

The combination of some data and an aching desire for an answer does not
ensure that a reasonable answer can be extracted from a given body of
data.
~ John Tukey

-----Oorspronkelijk bericht-----
Van: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org]
Namens Thomas Roth (geb. Kaliwe)
Verzonden: vrijdag 17 juli 2009 10:03
Aan: 'r-help at r-project.org'
Onderwerp: [R] how to evaluate character vector within pnorm()

Hi,

I'm trying to evaluate a character vector within pnorm. I have a vector
with values and names

x = c(2,3)
names(x) = c("mean", "sd")

so that i tried the following

temp = paste(names(x), x, sep = "=")

#gives
#> temp
#[1] "mean=2" "sd=3"

#Problem is that both values 2 and 3 are taken as values for the mean
argument in pnorm pnorm(0, eval(parse(text = temp)) )

#but not as
pnorm(0, mean = 2, sd = 3 )


#How can i get

pnorm(0, eval(parse(text = temp)) )

#to do

pnorm(0, mean = 2, sd = 3 )



Thank you for your time

Thomas Roth

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and provide commented, minimal, self-contained, reproducible code.

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Here is one way:


x <- c(2,3)
names(x) <- c("mean", "sd")

do.call(pnorm, c(list(0), as.list(x)))

 


Bill Venables
http://www.cmis.csiro.au/bill.venables/ 


-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org]
On Behalf Of Thomas Roth (geb. Kaliwe)
Sent: Friday, 17 July 2009 6:03 PM
To: 'r-help at r-project.org'
Subject: [R] how to evaluate character vector within pnorm()

Hi,

I'm trying to evaluate a character vector within pnorm. I have a vector 
with values and names

x = c(2,3)
names(x) = c("mean", "sd")

so that i tried the following

temp = paste(names(x), x, sep = "=")

#gives
#> temp
#[1] "mean=2" "sd=3"

#Problem is that both values 2 and 3 are taken as values for the mean 
argument in pnorm
pnorm(0, eval(parse(text = temp)) )

#but not as
pnorm(0, mean = 2, sd = 3 )


#How can i get

pnorm(0, eval(parse(text = temp)) )

#to do

pnorm(0, mean = 2, sd = 3 )



Thank you for your time

Thomas Roth

______________________________________________
R-help at r-project.org mailing list
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.