R help - Jan 2005 - How to filter information from a table into a new table

Hello,

 

Say I have a table T as follows

 

A b

1 2

1 3

2 2

2 3

...etc.

 

And I would like create a table C from this existing table T, but only
including rows where A=1.

 

How might I do this?

 

Thanks,

 

K - please reply to kafernan@uwaterloo.ca as well as I am on the digest
version :)

 


	[[alternative HTML version deleted]]

temp <- table(rpois(100,5),rpois(100,1))
temp
temp[temp[,1] > 1,]
temp[temp[,1] == 1,]
temp[temp[,1] == 2,]
temp[temp[,1] == 3,]

Of course you have not made it obvious if you are using the term table to mean
any output that looks like a table, but in general terms you will find
information in the documentation that comes with R, such as "An
Introduction to R."

In your case 

anything.you.like <- T[T[,1] == 1,]

Tom
> -----Original Message-----
> From: K Fernandes [mailto:kafernan at uwaterloo.ca]
> Sent: Thursday, 20 January 2005 7:15 AM
> To: r-help at stat.math.ethz.ch
> Subject: [R] How to filter information from a table into a new table
> 
> 
> Hello,
> 
>  
> 
> Say I have a table T as follows
> 
>  
> 
> A b
> 
> 1 2
> 
> 1 3
> 
> 2 2
> 
> 2 3
> 
> ...etc.
> 
>  
> 
> And I would like create a table C from this existing table T, but only
> including rows where A=1.
> 
>  
> 
> How might I do this?
> 
>  
> 
> Thanks,
> 
>  
> 
> K - please reply to kafernan at uwaterloo.ca as well as I am on 
> the digest
> version :)
> 
>  
> 
> 
> 	[[alternative HTML version deleted]]
> 
> ______________________________________________
> R-help at stat.math.ethz.ch mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide! 
> http://www.R-project.org/posting-guide.html
>

Hello,
I would like to use lm to model the equation y=x^2.

However, when I use

z<-lm(formula=y~x^2)
summary(z)

I obtain results that are equivalent to when I use 

z<-lm(formula=y~x)
summary(z)

That is, using x instead of x^2.

However, I do get different results when I use

z<-lm(formula=y~log(x))
summary(z)

Does anyone know why this might be the case?  Any ideas are appreciated.

Thank you,
K

On Wed, 19 Jan 2005 21:20:22 -0500 K Fernandes wrote:
> Hello,
> I would like to use lm to model the equation y=x^2.
> 
> However, when I use
> 
> z<-lm(formula=y~x^2)
> summary(z)
> 
> I obtain results that are equivalent to when I use 
> 
> z<-lm(formula=y~x)
> summary(z)
In formulas "^" specifies interactions. "^2" selects all
second order
interactions from the preceeding term.

If you want the arithmetic function "^" you have to insulate the term
in
I(), i.e., try to fit
  lm(y ~ I(x^2))

See ?formula for more details.
Z
> That is, using x instead of x^2.
> 
> However, I do get different results when I use
> 
> z<-lm(formula=y~log(x))
> summary(z)
> 
> Does anyone know why this might be the case?  Any ideas are
> appreciated.
> 
> Thank you,
> K
> 
> ______________________________________________
> R-help at stat.math.ethz.ch mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide!
> http://www.R-project.org/posting-guide.html
>

Hello,

I have three vectors defined as follows:
> x<-c(10,20,30,40,50)
> y1<-c(154,143,147,140,148)
> y2<-c(178,178,171,188,180)
I would like to plot y1 vs x and y2 vs x on the same graph.  How might I do
this?  I have looked through a help file on plots but could not find the
answer to plotting multiple plots on the same graph.

Thank you for your help,
K