R help - Jun 2008 - convert characters into integers in a matrix

Hello,

 

I will appreciate any suggestion for this simple problem. I have a matrix of
characters "A", "P", "M".

 

I want to convert those characters to integers 0,1, 1 respectively. I am
using the following R statements:

 

exprs.new<-gsub("P",1,exprs)

 exprs.new1 <- gsub("A",0,exprs.new)

 exprs.new2 <- gsub("M",1,exprs.new1)

 

The replaced integers are stored as characters and I cannot find a way to
convert the matrix to an integer matrix.

 

Thanks

manisha

 


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Manisha -

Will this work instead?

if 'a' is your matrix, try

ifelse(a == "A", 0, 1)

Best,
Erik Iverson

Manisha Brahmachary wrote:
> Hello,
> 
>  
> 
> I will appreciate any suggestion for this simple problem. I have a matrix
of
> characters "A", "P", "M".
> 
>  
> 
> I want to convert those characters to integers 0,1, 1 respectively. I am
> using the following R statements:
> 
>  
> 
> exprs.new<-gsub("P",1,exprs)
> 
>  exprs.new1 <- gsub("A",0,exprs.new)
> 
>  exprs.new2 <- gsub("M",1,exprs.new1)
> 
>  
> 
> The replaced integers are stored as characters and I cannot find a way to
> convert the matrix to an integer matrix.
> 
>  
> 
> Thanks
> 
> manisha
> 
>  
> 
> 
> 	[[alternative HTML version deleted]]
> 
> ______________________________________________
> R-help at 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.html
> and provide commented, minimal, self-contained, reproducible code.

Try this:

x <- matrix(c("A", "P", "M", "A",
"P", "M"), 2)
x[] <- as.numeric(as.character(factor(x, labels = c(0,1,1))))
x



On 6/10/08, Manisha Brahmachary <mb3058@c2b2.columbia.edu>
wrote:
>
> Hello,
>
>
>
> I will appreciate any suggestion for this simple problem. I have a matrix
> of
> characters "A", "P", "M".
>
>
>
> I want to convert those characters to integers 0,1, 1 respectively. I am
> using the following R statements:
>
>
>
> exprs.new<-gsub("P",1,exprs)
>
>   exprs.new1 <- gsub("A",0,exprs.new)
>
>   exprs.new2 <- gsub("M",1,exprs.new1)
>
>
>
> The replaced integers are stored as characters and I cannot find a way to
> convert the matrix to an integer matrix.
>
>
>
> Thanks
>
> manisha
>
>
>
>
>         [[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.html
> and provide commented, minimal, self-contained, reproducible code.
>


-- 
Henrique Dallazuanna
Curitiba-Paraná-Brasil
25° 25' 40" S 49° 16' 22" O

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