This is a slightly different formulation of your problem, but you
might find it easier to work with:
Start by making a data frame):
df=data.frame("Father"=c
("Fred","Fred","Fred","Barney","Barney"),"Mother"=c
("Mary","Mary","Mary","Liz","Liz"),"Child.Age"=c(4,7,9,3,5))
If you want to add a "wedding date" column to this data frame, then
df=data.frame(df,"WeddingDate"=c("December 12th, 1980","December
12th, 1980","December 12th, 1980","March 3rd, 2003","March 3rd, 2003"))
If, for example, you wanted to delete row #4, this is what you could do:
df=data.frame(df[-4,])
Similarly for column #4:
df=data.frame(df[,-4])
Kyle H. Ambert
Graduate Student, Dept. Behavioral Neuroscience
Oregon Health & Science University
[EMAIL PROTECTED]
On Mar 26, 2007, at 8:24 AM, Schmitt, Corinna wrote:
Hallo,
I have got an existing data frame and want to add a new column. The
existing data frame was created like this:
df <- rbind( c("Fred", "Mary", 4), c("Fred", "Mary", 7),
+ c("Fred", "Mary", 9), c("Barney", "Liz", 3),
+ c("Barney", "Liz", 5) )
df <- data.frame(df)
colnames(df) <- c("Father", "Mother", "Child.Age")
df
Father Mother Child.Age
1 Fred Mary 4
2 Fred Mary 7
3 Fred Mary 9
4 Barney Liz 3
5 Barney Liz 5
I want to add a column named weddingdate. How does this work and how can
I save the corresponding dates in the cells? (Fred-Mary: 12.12.1980,
Barney-Liz: 3.3.2003)
How can I delet a whole column or row if it is needed?
Thanks, Corinna
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