Re: [R] Fw: Evaluating strings as variables

2004-06-20 Thread Peter Dalgaard 
[EMAIL PROTECTED] writes:

> > sapply(colors, get)
> >
> 
> or?
> unlist(mget(colors, envir = as.environment(-1), inherits = TRUE))

Ah, yes, forgot about mget. Doesn't seem to make things much cleaner
though... (although get() also needs a bit more care about
environments). 

-- 
   O__   Peter Dalgaard Blegdamsvej 3  
  c/ /'_ --- Dept. of Biostatistics 2200 Cph. N   
 (*) \(*) -- University of Copenhagen   Denmark  Ph: (+45) 35327918
~~ - ([EMAIL PROTECTED]) FAX: (+45) 35327907

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Re: [R] Fw: Evaluating strings as variables

2004-06-20 Thread Matthias . Kohl 
> "Robin Gruna" <[EMAIL PROTECTED]> writes:
>
>> I have the following problem: I have a list as follows,
>>
>> > values <- list(red = 1, yellow = 2, blue = 3)
>>
>> > values
>> $red
>> [1] 1
>>
>> $yellow
>> [1] 2
>>
>> $blue
>> [1] 3
>>
>> There is also a vector containing the diffrent "colors" as character
>> strings:
>>
>> > colors <- c("red", "red", "blue", "yellow", "red", "blue")
>> > colors
>> [1] "red""red""blue"   "yellow" "red""blue"
>>
>> Now i can attach the list values to R:
>>
>> > attach(values)
>> > red
>> [1] 1
>>
>> etc...
>>
>> Now to my problem: How can I make R in a simple way to evaluate the
>> strings "red", "blue" etc. as variables, returning their numeric
>> values ? As result I want to get a vector containing the values of the
>> colors like this one:
>>
>> > values.colors
>> [1] 1 1 3 2 1 3
>
> Forget about the attach() business, and do
>
> values <- unlist(values) # or values <- c(red = 1, yellow = 2, blue = 3)
> values.colors <- values[colors]
>
> If you insist on going via variables, try
>
> sapply(colors, get)
>

or?
unlist(mget(colors, envir = as.environment(-1), inherits = TRUE))

Matthias

> --
>O__   Peter Dalgaard Blegdamsvej 3
>   c/ /'_ --- Dept. of Biostatistics 2200 Cph. N
>  (*) \(*) -- University of Copenhagen   Denmark  Ph: (+45) 35327918
> ~~ - ([EMAIL PROTECTED]) FAX: (+45) 35327907
>
> __
> [EMAIL PROTECTED] mailing list
> https://www.stat.math.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide!
> http://www.R-project.org/posting-guide.html

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Re: [R] Fw: Evaluating strings as variables

2004-06-20 Thread Peter Dalgaard 
"Robin Gruna" <[EMAIL PROTECTED]> writes:

> I have the following problem: I have a list as follows,
> 
> > values <- list(red = 1, yellow = 2, blue = 3)
> 
> > values
> $red
> [1] 1
> 
> $yellow
> [1] 2
> 
> $blue
> [1] 3
> 
> There is also a vector containing the diffrent "colors" as character strings:
> 
> > colors <- c("red", "red", "blue", "yellow", "red", "blue")
> > colors
> [1] "red""red""blue"   "yellow" "red""blue"  
> 
> Now i can attach the list values to R:
> 
> > attach(values)
> > red
> [1] 1
> 
> etc...
> 
> Now to my problem: How can I make R in a simple way to evaluate the strings "red", 
> "blue" etc. as variables, returning their numeric values ?
> As result I want to get a vector containing the values of the colors like this one:
> 
> > values.colors
> [1] 1 1 3 2 1 3

Forget about the attach() business, and do

values <- unlist(values) # or values <- c(red = 1, yellow = 2, blue = 3)
values.colors <- values[colors]

If you insist on going via variables, try

sapply(colors, get)

-- 
   O__   Peter Dalgaard Blegdamsvej 3  
  c/ /'_ --- Dept. of Biostatistics 2200 Cph. N   
 (*) \(*) -- University of Copenhagen   Denmark  Ph: (+45) 35327918
~~ - ([EMAIL PROTECTED]) FAX: (+45) 35327907

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[R] Fw: Evaluating strings as variables

2004-06-20 Thread Robin Gruna 

- Original Message - 
From: Robin Gruna 
To: [EMAIL PROTECTED] 
Sent: Sunday, June 20, 2004 5:42 PM
Subject: Evaluating strings as variables


Hello,
I have the following problem: I have a list as follows,

> values <- list(red = 1, yellow = 2, blue = 3)

> values
$red
[1] 1

$yellow
[1] 2

$blue
[1] 3

There is also a vector containing the diffrent "colors" as character strings:

> colors <- c("red", "red", "blue", "yellow", "red", "blue")
> colors
[1] "red""red""blue"   "yellow" "red""blue"  

Now i can attach the list values to R:

> attach(values)
> red
[1] 1

etc...

Now to my problem: How can I make R in a simple way to evaluate the strings "red", 
"blue" etc. as variables, returning their numeric values ?
As result I want to get a vector containing the values of the colors like this one:

> values.colors
[1] 1 1 3 2 1 3

Thanks a lot,
greetings Robin











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