Re: [R] Choosing a column for analysis in a function

From: Junnila, Jouni <Jouni.Junnila_at_PERKINELMER.COM>
Date: Fri, 01 Jun 2007 06:21:28 +0100


Thank you for the tip.
I already got a tip from Steve Ellison and it works for me. I'm now using

data.whole$Analyte.Values <- data.whole[[analyte]]

and everything goes smoothly!
I tested also your suggestion, but got the following error: "attempt to apply non-function" So I'm sticking with Steve's suggestion. Thanks anyway!!

-Jouni

-----Original Message-----
From: Adaikalavan Ramasamy [mailto:ramasamy_at_cancer.org.uk] Sent: 31. toukokuuta 2007 16:57
To: Junnila, Jouni
Cc: r-help_at_stat.math.ethz.ch
Subject: Re: [R] Choosing a column for analysis in a function

Perhaps the use of as.character() like following might help?

  data.whole$Analyte.Values <- data.whole$as.character(analyte)

Junnila, Jouni wrote:
> Hello all,
>
> I'm having a problem concerning choosing columns from a dataset in a
> function.
>
> I'm writing a function for data input etc., which first reads the
> data, and then does several data manipulation tasks.
> The function can be then used, with just giving the path of the .txt
> file where the data is being held.
>
> These datasets consists of over 20 different analytes. Though,
> statistical analyses should be made seperately analyte by analyte. So
> the function needs to be able to choose a certain analyte based on
> what the user of the function gives as a parameter when calling the
function.
> The name of the analyte user gives, is the same as a name of a column
> in the data set.
>
> The question is: how can I refer to the parameter which the user
> gives, inside the function? I cannot give the name of the analyte
> directly inside the function, as the same function should work for all

> the 20 analytes.
> I'm giving some code for clarification:
>

>> datainput <- function(data1,data2,data3,data4,data5,data6,analyte)
>> {

> ...
> ##data1-data6 being the paths of the six datasets I want to combine
> and analyte being the special analyte I want to analyze and which can
> be found on each of the datasets as a columnname.## ##Then:## ...
>> data.whole <- subset(data.whole,

> select=c(Sample.Name,Analyte.Values,Day,Plate))
>
> ##Is for choosing the columns needed for analysis. The "Analyte"
> should now be the column of the analyte, the users is referring to
> when calling the datainput-function. How to do it? ## I've tried
> something like
>> data.whole$Analyte.Values <- data.whole$analyte ##(Or in quotes

> "analyte")
> But this does not work. I've tried several other "tricks" also, but
> cannot get it to work. Can someone help?
>
> Thanks in advance,
>
> Jouni
>
> ______________________________________________
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> PLEASE do read the posting guide
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>
>

R-help_at_stat.math.ethz.ch 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. Received on Fri 01 Jun 2007 - 06:04:00 GMT

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