Re: [R] Simple use of dcast (reshape2 package)
On Tue, 22-Jan-2013 at 08:30AM -0500, Ista Zahn wrote:
| Hi,
|
| ID is not the value column. Your casting call should be
|
| dcast(aa, ... ~ Target, value.var = Eaten)
Thanks for that illumination. That does exactly what I wanted. I
knew there were many ways of achieving the result, but I was
particularly interested in understanding how dcast() would do it.
It's also more elegant than any of the other ways of achieving the
same result.
Thanks also for the other suggestions from various other responders.
P
|
| Best,
| Ista
|
| On Tue, Jan 22, 2013 at 4:23 AM, Patrick Connolly
| p_conno...@slingshot.co.nz wrote:
| Suppose I have a small dataframe
|
| aa
| Target Eaten ID
| 50 TPP 0 1
| 51 TPP 1 2
| 52 TPP 3 3
| 53 TPP 1 4
| 54 TPP 2 5
| 50.1GPA 9 1
| 51.1GPA11 2
| 52.1GPA 8 3
| 53.1GPA 8 4
| 54.1GPA10 5
|
| And I want to reshape it into
|
|ID TPP GPA
| 1 1 0 9
| 2 2 1 11
| 3 3 3 8
| 4 4 1 8
| 5 5 2 10
|
| I realise that dcast function in the reshape2 package can handle much
| more complicated tasks than that, but I can't make it do a simple one.
|
| If I simply tried
|
| dcast(aa, ... ~ Target)
| Using ID as value column: use value.var to override.
| Aggregation function missing: defaulting to length
|Eaten GPA TPP
| 1 0 0 1
| 2 1 0 2
| 3 2 0 1
| 4 3 0 1
| 5 8 2 0
| 6 9 1 0
| 710 1 0
| 811 1 0
|
| As per the help file, it's giving counts of the numbers in the Eaten
| column since that's the default fun.aggregate value.
|
| My questions are: what fun.aggregate would work? Alternatively, can
| value.var be set to something useful?
|
| TIA
|
| --
| ~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.
| ___Patrick Connolly
| {~._.~} Great minds discuss ideas
| _( Y )_ Average minds discuss events
| (:_~*~_:) Small minds discuss people
| (_)-(_) . Eleanor Roosevelt
|
| ~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.
|
| __
| R-help@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.
--
~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.
___Patrick Connolly
{~._.~} Great minds discuss ideas
_( Y )_ Average minds discuss events
(:_~*~_:) Small minds discuss people
(_)-(_) . Eleanor Roosevelt
~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.
__
R-help@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.
[R] Simple use of dcast (reshape2 package)
Suppose I have a small dataframe
aa
Target Eaten ID
50 TPP 0 1
51 TPP 1 2
52 TPP 3 3
53 TPP 1 4
54 TPP 2 5
50.1GPA 9 1
51.1GPA11 2
52.1GPA 8 3
53.1GPA 8 4
54.1GPA10 5
And I want to reshape it into
ID TPP GPA
1 1 0 9
2 2 1 11
3 3 3 8
4 4 1 8
5 5 2 10
I realise that dcast function in the reshape2 package can handle much
more complicated tasks than that, but I can't make it do a simple one.
If I simply tried
dcast(aa, ... ~ Target)
Using ID as value column: use value.var to override.
Aggregation function missing: defaulting to length
Eaten GPA TPP
1 0 0 1
2 1 0 2
3 2 0 1
4 3 0 1
5 8 2 0
6 9 1 0
710 1 0
811 1 0
As per the help file, it's giving counts of the numbers in the Eaten
column since that's the default fun.aggregate value.
My questions are: what fun.aggregate would work? Alternatively, can
value.var be set to something useful?
TIA
--
~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.
___Patrick Connolly
{~._.~} Great minds discuss ideas
_( Y )_ Average minds discuss events
(:_~*~_:) Small minds discuss people
(_)-(_) . Eleanor Roosevelt
~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.
__
R-help@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.
Re: [R] Simple use of dcast (reshape2 package)
you could try the following: DF - read.table(textConnection( Target Eaten ID 50 TPP 0 1 51 TPP 1 2 52 TPP 3 3 53 TPP 1 4 54 TPP 2 5 50.1GPA 9 1 51.1GPA11 2 52.1GPA 8 3 53.1GPA 8 4 54.1GPA10 5), header = TRUE) newDF - as.data.frame(with(DF, tapply(Eaten, list(ID, Target), c))) newDF$ID - unique(DF$ID) newDF I hope it helps. Best, Dimitris On 1/22/2013 10:23 AM, Patrick Connolly wrote: Suppose I have a small dataframe aa Target Eaten ID 50 TPP 0 1 51 TPP 1 2 52 TPP 3 3 53 TPP 1 4 54 TPP 2 5 50.1GPA 9 1 51.1GPA11 2 52.1GPA 8 3 53.1GPA 8 4 54.1GPA10 5 And I want to reshape it into ID TPP GPA 1 1 0 9 2 2 1 11 3 3 3 8 4 4 1 8 5 5 2 10 I realise that dcast function in the reshape2 package can handle much more complicated tasks than that, but I can't make it do a simple one. If I simply tried dcast(aa, ... ~ Target) Using ID as value column: use value.var to override. Aggregation function missing: defaulting to length Eaten GPA TPP 1 0 0 1 2 1 0 2 3 2 0 1 4 3 0 1 5 8 2 0 6 9 1 0 710 1 0 811 1 0 As per the help file, it's giving counts of the numbers in the Eaten column since that's the default fun.aggregate value. My questions are: what fun.aggregate would work? Alternatively, can value.var be set to something useful? TIA -- Dimitris Rizopoulos Assistant Professor Department of Biostatistics Erasmus University Medical Center Address: PO Box 2040, 3000 CA Rotterdam, the Netherlands Tel: +31/(0)10/7043478 Fax: +31/(0)10/7043014 Web: http://www.erasmusmc.nl/biostatistiek/ __ R-help@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.
Re: [R] Simple use of dcast (reshape2 package)
Hi, Patrick,
I think (with reshape from the stats package)
reshape( aa, idvar = ID, v.names = Eaten, timevar = Target,
direction = wide)
does the trick (followed by renaming the columns of the resulting data
frame).
Hth -- Gerrit
On Tue, 22 Jan 2013, Patrick Connolly wrote:
Suppose I have a small dataframe
aa
Target Eaten ID
50 TPP 0 1
51 TPP 1 2
52 TPP 3 3
53 TPP 1 4
54 TPP 2 5
50.1GPA 9 1
51.1GPA11 2
52.1GPA 8 3
53.1GPA 8 4
54.1GPA10 5
And I want to reshape it into
ID TPP GPA
1 1 0 9
2 2 1 11
3 3 3 8
4 4 1 8
5 5 2 10
I realise that dcast function in the reshape2 package can handle much
more complicated tasks than that, but I can't make it do a simple one.
If I simply tried
dcast(aa, ... ~ Target)
Using ID as value column: use value.var to override.
Aggregation function missing: defaulting to length
Eaten GPA TPP
1 0 0 1
2 1 0 2
3 2 0 1
4 3 0 1
5 8 2 0
6 9 1 0
710 1 0
811 1 0
As per the help file, it's giving counts of the numbers in the Eaten
column since that's the default fun.aggregate value.
My questions are: what fun.aggregate would work? Alternatively, can
value.var be set to something useful?
TIA
--
~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.
___Patrick Connolly
{~._.~} Great minds discuss ideas
_( Y )_ Average minds discuss events
(:_~*~_:) Small minds discuss people
(_)-(_) . Eleanor Roosevelt
~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.
__
R-help@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.
__
R-help@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.
Re: [R] Simple use of dcast (reshape2 package)
Hi,
ID is not the value column. Your casting call should be
dcast(aa, ... ~ Target, value.var = Eaten)
Best,
Ista
On Tue, Jan 22, 2013 at 4:23 AM, Patrick Connolly
p_conno...@slingshot.co.nz wrote:
Suppose I have a small dataframe
aa
Target Eaten ID
50 TPP 0 1
51 TPP 1 2
52 TPP 3 3
53 TPP 1 4
54 TPP 2 5
50.1GPA 9 1
51.1GPA11 2
52.1GPA 8 3
53.1GPA 8 4
54.1GPA10 5
And I want to reshape it into
ID TPP GPA
1 1 0 9
2 2 1 11
3 3 3 8
4 4 1 8
5 5 2 10
I realise that dcast function in the reshape2 package can handle much
more complicated tasks than that, but I can't make it do a simple one.
If I simply tried
dcast(aa, ... ~ Target)
Using ID as value column: use value.var to override.
Aggregation function missing: defaulting to length
Eaten GPA TPP
1 0 0 1
2 1 0 2
3 2 0 1
4 3 0 1
5 8 2 0
6 9 1 0
710 1 0
811 1 0
As per the help file, it's giving counts of the numbers in the Eaten
column since that's the default fun.aggregate value.
My questions are: what fun.aggregate would work? Alternatively, can
value.var be set to something useful?
TIA
--
~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.
___Patrick Connolly
{~._.~} Great minds discuss ideas
_( Y )_ Average minds discuss events
(:_~*~_:) Small minds discuss people
(_)-(_) . Eleanor Roosevelt
~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.
__
R-help@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.
__
R-help@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.
Re: [R] Simple use of dcast (reshape2 package)
Hi,
This could be done with ?aggregate()
res-aggregate(aa$Eaten,by=list(ID=aa$ID),FUN=function(x) x)
res1-data.frame(ID=res[,1],data.frame(res[[2]]))
names(res1)[2:3]-unique(aa$Target)
res1
# ID TPP GPA
#1 1 0 9
#2 2 1 11
#3 3 3 8
#4 4 1 8
#5 5 2 10
A.K.
- Original Message -
From: Patrick Connolly p_conno...@slingshot.co.nz
To: R-help r-help@r-project.org
Cc:
Sent: Tuesday, January 22, 2013 4:23 AM
Subject: [R] Simple use of dcast (reshape2 package)
Suppose I have a small dataframe
aa
Target Eaten ID
50 TPP 0 1
51 TPP 1 2
52 TPP 3 3
53 TPP 1 4
54 TPP 2 5
50.1 GPA 9 1
51.1 GPA 11 2
52.1 GPA 8 3
53.1 GPA 8 4
54.1 GPA 10 5
And I want to reshape it into
ID TPP GPA
1 1 0 9
2 2 1 11
3 3 3 8
4 4 1 8
5 5 2 10
I realise that dcast function in the reshape2 package can handle much
more complicated tasks than that, but I can't make it do a simple one.
If I simply tried
dcast(aa, ... ~ Target)
Using ID as value column: use value.var to override.
Aggregation function missing: defaulting to length
Eaten GPA TPP
1 0 0 1
2 1 0 2
3 2 0 1
4 3 0 1
5 8 2 0
6 9 1 0
7 10 1 0
8 11 1 0
As per the help file, it's giving counts of the numbers in the Eaten
column since that's the default fun.aggregate value.
My questions are: what fun.aggregate would work? Alternatively, can
value.var be set to something useful?
TIA
--
~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.
___ Patrick Connolly
{~._.~} Great minds discuss ideas
_( Y )_ Average minds discuss events
(:_~*~_:) Small minds discuss people
(_)-(_) . Eleanor Roosevelt
~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.
__
R-help@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.
__
R-help@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.
