R help - Nov 2009 - How to select the part of column name heads?

 
Dear R helpers,
 
Suppose I am reading a csv file as
 
yd    =   read.csv("mydata.csv")
 
The actual data in the mydata.csv file is say for example like this -
 
 
Date             day_1     days_15     day_30    days_60    days_90     
days_180
Nov 11            5             14               1               3             
21               8
Nov 10            7              1                3              11             
5                14                  
Nov 09            2             10               3                6             
4                 2
........
........
 
and so on.
While I have done all the related analysis, 
 
(1) how do I read
 
maturity   <-   c(1, 15, 30, 60, 90, 180)  # these are the part of column
names in numeric class.
 
i.e. I want the no of days appearing in column name heads to be expressed like
this.
 
(2) Also, how do select the subset of maturity e.g.
 
maturity_sub   <-  c(30, 60, 90)
 
 
Thanking you all in advance
 
 
Regards
 
 
Julia

************************************************

Only a man of Worth sees Worth in other men

************************************************


      
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Hi

r-help-bounces at r-project.org napsal dne 12.11.2009 14:59:57:
>  
> Dear R helpers,
>  
> Suppose I am reading a csv file as
>  
> yd    =   read.csv("mydata.csv")
>  
> The actual data in the mydata.csv file is say for example like this -
>  
>  
> Date             day_1     days_15     day_30    days_60    days_90      
days_180
> Nov 11            5             14               1               
> 3              21               8
> Nov 10            7              1                
> 3              11              5                14                   
> Nov 09            2             10               3                
> 6              4                 2
> ........
> ........
>  
> and so on.
> While I have done all the related analysis, 
>  
> (1) how do I read
>  
> maturity   <-   c(1, 15, 30, 60, 90, 180)  # these are the part of 
column 
> names in numeric class.
>  
> i.e. I want the no of days appearing in column name heads to be 
expressed like this.
>  
I had similar problem some time ago. Chuck Taylor helped me with this and 
I suppose you can use it too

x<-names(yd)
maturity <- substring(x, regexpr("[0-9]+$", x))

> (2) Also, how do select the subset of maturity e.g.
>  
> maturity_sub   <-  c(30, 60, 90)
use maturity[maturity>15]

regards
Petr


>  
>  
> Thanking you all in advance
>  
>  
> Regards
>  
>  
> Julia
> 
> ************************************************
> 
> Only a man of Worth sees Worth in other men
> 
> ************************************************
> 
> 
> 
>    [[alternative HTML version deleted]]
> 
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