From: Bert Jacobs <b.jacobs_at_pandora.be>

Date: Thu, 15 May 2008 21:04:22 +0200

F4

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Date: Thu, 15 May 2008 21:04:22 +0200

Jim,

The problem with your solution is that the columnames are not in the same order as in the dataframe SDF2

From: jim holtman [mailto:jholtman_at_gmail.com]
Sent: 15 May 2008 18:12

To: Bert Jacobs

Subject: Re: [R] Adding columns to dataframe

Will somethink like this work to just add dummy columns:

*> x <- data.frame(a=1:10, b=1:10)
**> y <- data.frame(a=1, c=1, d=1, e=1, f=1)
**> # get unique names in y
**> uniq <- setdiff(names(y), names(x))
**> # add dummy columns to x
*

> x[uniq] <- 0

*> x
*

a b c d e f

1 1 1 0 0 0 0

2 2 2 0 0 0 0

3 3 3 0 0 0 0

4 4 4 0 0 0 0

5 5 5 0 0 0 0

6 6 6 0 0 0 0

7 7 7 0 0 0 0

8 8 8 0 0 0 0

9 9 9 0 0 0 0

10 10 10 0 0 0 0

*>
*

On Thu, May 15, 2008 at 12:07 PM, Bert Jacobs <b.jacobs_at_pandora.be> wrote:

Apparently the formula I use at the moment didn't pass through. As you see I use some kind of merge function.

DFNEW <- merge(SDF2[,4:163],SDF1[,4:ncol(SDF1)], all.y = TRUE,all.x = FALSE)[names(SDF2[,4:163])]

Bert

From: Bert Jacobs [mailto:b.jacobs_at_pandora.be]
Sent: 15 May 2008 18:02

To: 'jim holtman'

Subject: RE: [R] Adding columns to dataframe

Hi Jim,

The data in the new created dataframe looks OK to me, it's only a the row position that has been changed, as if the merge evolve in some kind of sorting system.

The idea is simply to add empty dummy columns, but the order of the column names should be the same as in the dataframe SDF2

Bert

From: jim holtman [mailto:jholtman_at_gmail.com]
Sent: 15 May 2008 17:41

To: Bert Jacobs

Subject: Re: [R] Adding columns to dataframe

Does the data in the two dataframes match so that as the new columns are added the data is correct? Or do you just want dummy (empty) columns added? Can you use 'merge'?

On Thu, May 15, 2008 at 11:34 AM, Bert Jacobs <b.jacobs_at_pandora.be> wrote:

Hi,

I have a dataframe SDF1 that looks like this:

Char1 Char2 Char 3 W.2007.02 W.2007.09 W.2007.16 W.2008.13

A C1 F1 F2 F3 A C2

F4

B C3 F5F6

I have another dataframe SDF2 with 163 cols that has the following column names

Char1 Char2 Char 3 W.2007.02 W.2007.03 W.2007.04 W.2007.05 W.2007.06 .W.2007.52 W.2008.01 . W.2008.13

Now I would like to add the missing period names to SDF1 as new columns and in the same order as in SDF2.

Therefore I use the following formula:

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-- Jim Holtman Cincinnati, OH +1 513 646 9390 What is the problem you are trying to solve? -- Jim Holtman Cincinnati, OH +1 513 646 9390 What is the problem you are trying to solve? [[alternative HTML version deleted]] ______________________________________________ R-help_at_r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.Received on Thu 15 May 2008 - 19:05:36 GMT

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