sort data frame columns according to a list

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So your second dataframe, say DF2, has sample IDs in one of its  
columns, say "colnames", (or are they in in the names?)

( Examples and output of str() are requested to avoid exactly such  
ambiguity.)

If it is the former, then;

DF1[ , DF2colnames ]   # could do it.
David Winsemius

On Mar 16, 2009, at 4:41 PM, Jie Zhang wrote:

> HI,
>
> I have searched the R-help achive, trying to find a way to sort  
> columns in a data frame according to a specific list, but not be  
> able to find a general way to do it.
>
> My data frame contains columns, with each one named from a sample  
> ID, and each sample was measured in a specific time, generating one  
> column of data, now I would like to sort the columns according to  
> the time course, so I have the second data frame containing sample  
> IDs with time point, but how should I do the sorting?
>
> Thanks a lot!
>
> Jie
>
>
>
> 	[[alternative HTML version deleted]]
>
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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.

David Winsemius, MD
Heritage Laboratories
West Hartford, CT

So your second dataframe, say DF2, has sample IDs in one of its  
columns, say "colnames", (or are they in in the names?)

( Examples and output of str() are requested to avoid exactly such  
ambiguity.)

If it is the former, then;

DF1[ , DF2colnames ]   # could do it.
^
DF1[ , DF2$colnames ]

-- 
David Winsemius

On Mar 16, 2009, at 4:41 PM, Jie Zhang wrote:

HI,

I have searched the R-help achive, trying to find a way to sort  
columns in a data frame according to a specific list, but not be  
able to find a general way to do it.

My data frame contains columns, with each one named from a sample  
ID, and each sample was measured in a specific time, generating one  
column of data, now I would like to sort the columns according to  
the time course, so I have the second data frame containing sample  
IDs with time point, but how should I do the sorting?

Thanks a lot!

Jie

David Winsemius, MD
Heritage Laboratories
West Hartford, CT
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