Thanks. I have another question:
In the following data frame df, I want to replace all values in col1 that are
higher than 3 with NA.
df= data.frame(col1=c(1:5, NA),col2= c(2,NA,4:7))
----- Original Message ----
From: John Kane <[EMAIL PROTECTED]>
To: joseph <[EMAIL PROTECTED]>; r-help@r-project.org
Cc: r-help@r-project.org
Sent: Thursday, February 14, 2008 3:09:40 PM
Subject: Re: [R] data frame question
Create
the
new
data.frame
and
do
the
muliplying
on
it?
df2
<-
df1
df2[,1]
<-
df2[,1]*2
---
joseph
<[EMAIL PROTECTED]>
wrote:
>
>
>
Hi
>
>
I
have
a
data
frame
df1
in
which
I
would
like
to
>
multiply
col1
>
by
2.
>
>
>
The
way
I
did
it
does
not
allow
me
to
keep
the
old
>
data
>
frame.
>
>
>
How
can
I
do
this
and
be
able
to
create
a
new
data
>
frame
>
df2?
>
>
>
>
df1=
data.frame(col1=
c(3,
5,
NA,
1),
col2=
c(4,
>
NA,6,
>
2))
>
>
>
>
df1
>
>
>
col1
col2
>
>
>
1
3
4
>
>
>
2
5
NA
>
>
>
3
NA
6
>
>
>
4
1
2
>
>
>
>
df1$col1=df1$col1*2
>
>
>
>
df1
>
>
>
col1
col2
>
>
>
1
6
4
>
>
>
2
10
NA
>
>
>
3
NA
6
>
>
>
4
2
2
>
>
>
>
>
>
>
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