[R] Choosing subset of data.frame

[arun]

HI,
You could also use:

beta_results[!is.na(match(beta_results[,1],instru)),]
#  instrument beta_values
#3        JKL       0.529
#6        STU      -1.080
#8        XYZ       0.420


#If there are no duplicates, this could also work

beta_results[match(instru,beta_results[,1]),]
#  instrument beta_values
#3        JKL       0.529
#6        STU      -1.080
#8        XYZ       0.420

A.K.


----- Original Message -----
From: Katherine Gobin <katherine_gobin at yahoo.com>
To: "r-help at r-project.org" <r-help at r-project.org>
Cc: 
Sent: Thursday, June 20, 2013 6:45 AM
Subject: [R] Choosing subset of data.frame

Dear R Forum

I have a data frame as

beta_results = data.frame(instrument = c("ABC", "DEF", "JKL",  "LMN", "PQR", "STU", "UVW", "XYZ"), 

beta_values = c(1.27, -0.22, 0.529, 0.011, 2.31, -1.08, -2.7, 0.42))

> beta_results
  instrument beta_values
1        ABC       1.270
2        DEF      -0.220
3        JKL       0.529
4        LMN       0.011
5        PQR       2.310
6        STU      -1.080
7        UVW      -2.700
8        XYZ       0.420


Through some other process, I am getting instrument names as say (which may change each time I run this process
and hence I can't hard code it).


instru = c("JKL", "STU", "XYZ")

Now I want the subset of beta_results, (say beta_results_A)  pertaining to only instru i.e

beta_results_A = 


  instrument beta_values
3        JKL       0.529
6        STU      -1.080
8        XYZ       0.420


I did try

beta_results_A = beta_results[instru]
or
beta_results_A = subset(beta_results, beta_results$instrument = instru]

but I guess it's failing.

Kindly guide

Regards

Katherine
    [[alternative HTML version deleted]]

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