R help - Jul 2015 - Error in "rownames"

Hello,

When I type the code *rownames(gene_exp_matrix)<-levels(geneidfactor)*,the
error happens: Error in "rownames<-(*tmp*,value=character(0)):can not
set
object to 'rownames'.

I am using Mac OS X10.10.2.

How can I fix this problem?

Thank a lot.

Yao



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View this message in context:
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Sent from the R help mailing list archive at Nabble.com.

Without a reproducible example that includes some sample data (fake is
fine), the code you used, and some clear idea of what output you
expect, it's impossible to figure out how to help you. Here are some
suggestions for creating a good reproducible example:
http://stackoverflow.com/questions/5963269/how-to-make-a-great-r-reproducible-example



On Wed, Jul 22, 2015 at 3:50 AM, JIALU YAO <YAOJIALU at foxmail.com>
wrote:
> Hello,
>
> When I type the code
*rownames(gene_exp_matrix)<-levels(geneidfactor)*,the
> error happens: Error in "rownames<-(*tmp*,value=character(0)):can
not set
> object to 'rownames'.
>
> I am using Mac OS X10.10.2.
>
> How can I fix this problem?
>
> Thank a lot.
>
> Yao
>
>
>
> --
> View this message in context:
http://r.789695.n4.nabble.com/Error-in-rownames-tp4710183.html
> Sent from the R help mailing list archive at Nabble.com.
>
> ______________________________________________
> R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see
> https://stat.ethz.ch/mailman/listinfo/r-help
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> and provide commented, minimal, self-contained, reproducible code.


-- 
Sarah Goslee
http://www.functionaldiversity.org

On Jul 22, 2015, at 12:50 AM, JIALU YAO wrote:
> Hello,
> 
> When I type the code
*rownames(gene_exp_matrix)<-levels(geneidfactor)*,the
> error happens: Error in "rownames<-(*tmp*,value=character(0)):can
not set
> object to 'rownames'.
> 
> I am using Mac OS X10.10.2.
> 
> How can I fix this problem?
> 
The error suggests that levels(geneidfactor) is returning a vector of length 0.

How do you fix that? The first thing I would do is check to see if spelling
might be an issue and then see what str(geneidfactor) returns. If this process
makes any sense (noting that the order of a dataframe factor variable might not
be the same as the level-names), then my guess is that you failed to include the
dataframe name where the factor vector resides.
> 
-- 

David Winsemius
Alameda, CA, USA