R help - Jan 2006 - matrix math

I am using R 2.1.1 in an windows XP environment.
   
  I have 2 dataframes, temp1 and temp2.
   
  Each dataframe has 20 variables (“cocolumns") and 525 observations
(“rows”).  All variables are numeric.
   
  I want to create a new dataframe that also has 20 columns and 525 rows.  The
values in this dataframe should be the sum of the 2 other dataframe.
   
  (i.e. temp1$column 1+temp2$column1, temp1$column2+temp2$column2, etc)
   
  What is the best/easiest way to accomplish this?
   
  Is I wish to "multiply" (instead of sum) the columns, how do I?
   
  I tried:
   
  temp3<-as.matrix(temp1)+as.matrix(temp2)
   
  I get the following error message: “Error in as.matrix(temp1) +
as.matrix(temp2) :
          non-numeric argument to binary operator” 


		
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>   I am using R 2.1.1 in an windows XP environment.
>    
>   I have 2 dataframes, temp1 and temp2.
>    
>   Each dataframe has 20 variables (?cocolumns") and
> 525 observations (?rows?).  All variables are
> numeric.
>    
>   I want to create a new dataframe that also has 20
> columns and 525 rows.  The values in this dataframe
> should be the sum of the 2 other dataframe.
>    
>   (i.e. temp1$column 1+temp2$column1,
> temp1$column2+temp2$column2, etc)
>    
>   What is the best/easiest way to accomplish this?
>    
>   Is I wish to "multiply" (instead of sum) the
> columns, how do I?
>    
>   I tried:
>    
>   temp3<-as.matrix(temp1)+as.matrix(temp2)
>    
>   I get the following error message: ?Error in
> as.matrix(temp1) + as.matrix(temp2) : 
>           non-numeric argument to binary operator? 
> 
> 
> 		
> ---------------------------------
> $16.99/mo. or less

>  I have 2 dataframes, temp1 and temp2.
>
>  Each dataframe has 20 variables (“cocolumns") and 525
observations
>(“rows”).  All variables are numeric.
>
>  I want to create a new dataframe that also has 20 columns and 525 rows.  
>The values in this dataframe should be
>the sum of the 2 other dataframe.
>foo <- data.frame(c(1,1,1,1),c(2,2,2,2))
>bar <- data.frame(c(1,2,3,4),c(5,6,7,8))
>foo+bar
  c.1..1..1..1. c.2..2..2..2.
1             2             7
2             3             8
3             4             9
4             5            10

If your data frames are actually data frames, it should
work.
>class(foo)
[1] "data.frame"

On 4 Jan 2006 at 14:10, r user wrote:

Date sent:      	Wed, 4 Jan 2006 14:10:24 -0800 (PST)
From:           	r user <ruser2006 at yahoo.com>
To:             	rhelp <r-help at stat.math.ethz.ch>
Subject:        	[R] matrix math
>   I am using R 2.1.1 in an windows XP environment.
> 
>   I have 2 dataframes, temp1 and temp2.
> 
>   Each dataframe has 20 variables (?cocolumns") and 525 observations
>   (?rows?).  All variables are numeric.
> 
>   I want to create a new dataframe that also has 20 columns and 525
>   rows.  The values in this dataframe should be the sum of the 2 other
>   dataframe.
> 
>   (i.e. temp1$column 1+temp2$column1, temp1$column2+temp2$column2,
>   etc)
> 
>   What is the best/easiest way to accomplish this?
> 
>   Is I wish to "multiply" (instead of sum) the columns, how do I?
> 
>   I tried:
> 
>   temp3<-as.matrix(temp1)+as.matrix(temp2)
> 
>   I get the following error message: ?Error in as.matrix(temp1) +
>   as.matrix(temp2) : 
>           non-numeric argument to binary operator? 
Hi

although you think all variables are numeric they probably are not.

what does

str(temp1) or str(temp2)

tells you

HTH
Petr




> 
> 
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>  [[alternative HTML version deleted]]
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Petr Pikal
petr.pikal at precheza.cz