Looking at the results that you are expecing I think that you just want to
have only the record from black colored people. If that't the case, for
this dataset the easiest way is to subset the data i.e
data(HairEyeColor)
x=as.data.frame(HairEyeColor)
x2=x[x$Hair==Black,1:3]
x2
Hair EyeSex
1 Black Brown Male
5 Black Blue Male
9 Black Hazel Male
13 Black Green Male
17 Black Brown Female
21 Black Blue Female
25 Black Hazel Female
29 Black Green Female
Is this what you needed?
Francisco
From: Muhammad Subianto [EMAIL PROTECTED]
To: r-help@stat.math.ethz.ch
Subject: [R] how to make automatically each level from data.frame to vector
Date: Sat, 12 Nov 2005 21:37:27 +0100
Dear R-helpers,
Suppose I have dataset like this below:
data(HairEyeColor)
dfHEC - as.data.frame(as.table(HairEyeColor))
my.dfHEC - data.frame(Hair=rep(dfHEC$Hair,dfHEC$Freq),
Eye=rep(dfHEC$Eye,dfHEC$Freq),
Sex=rep(dfHEC$Sex,dfHEC$Freq))
my.dfHEC
my.dfHEC$Hair
my.dfHEC$Eye
my.dfHEC$Sex
and I know all levels for Hair, Eye and Sex.
In my case, I want to expand.grid all attributes but in Hair I only
include Black hair:
Hair.e - c(Black)
Eye.e - c(Brown,Blue,Hazel,Green)
Sex.e - c(Male,Female)
#I can do like,
dfHEC.Black - expand.grid(Hair.e,Eye.e,Sex.e)
dfHEC.Black
My question is how to make automatically each level from data.frame to
vector.
I don't want to make definition for each level again (Hair.e, Eye.e,
Sex.e).
In the others word, how can I make expand.grid (each level) from
data.frame automatically if Hair is only (Black).
The result I need like,
Var1 Var2 Var3
1 Black Brown Male
2 Black Blue Male
3 Black Hazel Male
4 Black Green Male
5 Black Brown Female
6 Black Blue Female
7 Black Hazel Female
8 Black Green Female
Thanks in advance.
Best, Muhammad Subianto
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