[R] Converting Strings to Variable names

2010-11-04 Thread Anand Bambhania 
Hi all,

I am processing 24 samples data and combine them in single table called
CombinedSamples using following:

CombinedSamples-rbind(Sample1,Sample2,Sample3)

Now variables Sample1, Sample2 and Sample3 have many different columns.

To make it more flexible for other samples I'm replacing above code with a
for loop:

#Sample is a string vector containing all 24 sample names

for (k in 1:length(Sample))
{
  CombinedSamples-rbind(get(Sample[k]))
}

This code only stores last sample data as CombinedSample gets overwritten
every time. Using CombinedSamples[k] or CombinedSamples[k,] causes
dimension related errors as each Sample has several rows and not just 24. So
how can I assign data of all 24 samples to CombinedSamples?

Thanks,

Anand

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Re: [R] Converting Strings to Variable names

2010-11-04 Thread Erik Iverson 



Anand Bambhania wrote:

Hi all,

I am processing 24 samples data and combine them in single table called
CombinedSamples using following:

CombinedSamples-rbind(Sample1,Sample2,Sample3)


Please use reproducible examples.



Now variables Sample1, Sample2 and Sample3 have many different columns.


Then you can't 'rbind' them, correct?

From ?rbind:

 If there are several matrix arguments, they must all have the same
 number of columns (or rows) and this will be the number of columns
 (or rows) of the result.


To make it more flexible for other samples I'm replacing above code with a
for loop:

#Sample is a string vector containing all 24 sample names

for (k in 1:length(Sample))
{
  CombinedSamples-rbind(get(Sample[k]))
}

This code only stores last sample data as CombinedSample gets overwritten
every time. Using CombinedSamples[k] or CombinedSamples[k,] causes
dimension related errors as each Sample has several rows and not just 24. So
how can I assign data of all 24 samples to CombinedSamples?


I don't know since I'm unsure of the structure of these objects.

If they all have the same structure, I'd store them in a list and
do:

CombinedSamples - do.call(rbind, sampleList)

otherwise perhaps using

?Reduce and ?merge.  If you can provide a more complete example
to the list, please do. You need not resort to a for loop/get
hack for this.

Best,
--Erik





Thanks,

Anand

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


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

Re: [R] Converting Strings to Variable names

2010-11-04 Thread Mike Rennie 
Hi Anand,

Try creating a variable where you can store your data, and append it in your
loop. See added lines of code to include below...

On Thu, Nov 4, 2010 at 9:43 AM, Anand Bambhania amb1netwo...@gmail.comwrote:

 Hi all,

 I am processing 24 samples data and combine them in single table called
 CombinedSamples using following:

 CombinedSamples-rbind(Sample1,Sample2,Sample3)

 Now variables Sample1, Sample2 and Sample3 have many different columns.

 To make it more flexible for other samples I'm replacing above code with a
 for loop:

 #Sample is a string vector containing all 24 sample names


#create a variable to stick your results

res- NULL


 for (k in 1:length(Sample))
 {
  CombinedSamples-rbind(get(Sample[k]))

  res-c(res, CombinedSamples)

 }

 Now, every iteration of your loop should append CombinedSamples to res, and
you won't overwrite your results every time.

HTH,

Mike



 This code only stores last sample data as CombinedSample gets overwritten
 every time. Using CombinedSamples[k] or CombinedSamples[k,] causes
 dimension related errors as each Sample has several rows and not just 24.
 So
 how can I assign data of all 24 samples to CombinedSamples?

 Thanks,

 Anand

[[alternative HTML version deleted]]

 __
 R-help@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.htmlhttp://www.r-project.org/posting-guide.html
 and provide commented, minimal, self-contained, reproducible code.


[[alternative HTML version deleted]]

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R-help@r-project.org mailing list
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.