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Wolfgang Polasek

2009-Aug-28 22:15 UTC

[R] Numeric, 2 ??? as a result of marix???

Strange things are going on in R, if you reshape a matrix in
R:> g=gretldata[1:2,]
> g   Empfang   Versand  Transit  Inland Ausland    SumS
1 787844.0 1307176.6 223395.4 1474726 16199.1 3809341
2 421473.1  306445.4 448801.2 1779402 14445.6 2970567> dim(g)
[1] 2 6> as.vector(g)   Empfang   Versand  Transit  Inland Ausland    SumS
1 787844.0 1307176.6 223395.4 1474726 16199.1 3809341
2 421473.1  306445.4 448801.2 1779402 14445.6 2970567> gg=matrix(as.vector(g),nrow=1,byrow=TRUE)
> gg     [,1]      [,2]      [,3]      [,4]      [,5]      [,6]
[1,] Numeric,2 Numeric,2 Numeric,2 Numeric,2 Numeric,2
Numeric,2> Help please,the docu on thids is lousy!!!.
Wolfgang

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Duncan Murdoch

2009-Aug-29 10:26 UTC

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[R] Numeric, 2 ??? as a result of marix???

Wolfgang Polasek wrote:> Strange things are going on in R, if you reshape a matrix in R:
>   
>> g=gretldata[1:2,]
>> g
>>     
>    Empfang   Versand  Transit  Inland Ausland    SumS
> 1 787844.0 1307176.6 223395.4 1474726 16199.1 3809341
> 2 421473.1  306445.4 448801.2 1779402 14445.6 2970567
>   
>> dim(g)
>>     
> [1] 2 6
>   
>> as.vector(g)
>>     
>    Empfang   Versand  Transit  Inland Ausland    SumS
> 1 787844.0 1307176.6 223395.4 1474726 16199.1 3809341
> 2 421473.1  306445.4 448801.2 1779402 14445.6 2970567
>   
>> gg=matrix(as.vector(g),nrow=1,byrow=TRUE)
>> gg
>>     
>      [,1]      [,2]      [,3]      [,4]      [,5]      [,6]
> [1,] Numeric,2 Numeric,2 Numeric,2 Numeric,2 Numeric,2 Numeric,2
>   
>  Help please,the docu on thids is lousy!!!.
If you don't like the documentation, then improve it.  You don't make 
friends by insulting people who provide you with something for free.

Duncan Murdoch

Stefan Grosse

2009-Aug-29 11:00 UTC

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[R] Numeric, 2 ??? as a result of marix???

On Sat, 29 Aug 2009 00:15:45 +0200 Wolfgang Polasek
<wolfgang.polasek at gmail.com> wrote:

WP> > g=gretldata[1:2,]
WP> > g
WP>    Empfang   Versand  Transit  Inland Ausland    SumS
WP> 1 787844.0 1307176.6 223395.4 1474726 16199.1 3809341
WP> 2 421473.1  306445.4 448801.2 1779402 14445.6 2970567
WP> > dim(g)
WP> [1] 2 6
WP> > as.vector(g)
WP>    Empfang   Versand  Transit  Inland Ausland    SumS
WP> 1 787844.0 1307176.6 223395.4 1474726 16199.1 3809341
WP> 2 421473.1  306445.4 448801.2 1779402 14445.6 2970567
WP> > gg=matrix(as.vector(g),nrow=1,byrow=TRUE)
WP> > gg
WP>      [,1]      [,2]      [,3]      [,4]      [,5]      [,6]
WP> [1,] Numeric,2 Numeric,2 Numeric,2 Numeric,2 Numeric,2 Numeric,2
WP> >
WP>  Help please,the docu on thids is lousy!!!.

Depending on what you want which is not really clear again, you can use 
?reshape
or maybe also 
?stack

to reshape a data-frame which gretldata supposedly is.

Note that with your as.vector(g) you dont create a vector as:
dat1<-data.frame(x=1:3, y=5:7)
v1<-as.vector(dat1)
str(v1)
resp.
is.vector(v1)

clearly shows. So you were also not "debugging" your problem. And you
clearly did not have a look at the "lousy" documentation as this is
shown in the example in ?as.vector, so don't blame others!

Cheers
Stefan

Gabor Grothendieck

2009-Aug-29 11:31 UTC

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[R] Numeric, 2 ??? as a result of marix???

g does not appear to be a matrix, as described.   Its more
likely a data frame.   If that is the case then as.matrix(g)
will create a matrix from it.

Also depending on what you want to do ?unlist, ?t or ?c
may be of help.  Also try str(g) and dput(g) to see
internals of object as they seem not to be what you
believe them to be.

On Fri, Aug 28, 2009 at 6:15 PM, Wolfgang
Polasek<wolfgang.polasek at gmail.com> wrote:> Strange things are going on in R, if you reshape a matrix in R:
>> g=gretldata[1:2,]
>> g
> ? Empfang ? Versand ?Transit ?Inland Ausland ? ?SumS
> 1 787844.0 1307176.6 223395.4 1474726 16199.1 3809341
> 2 421473.1 ?306445.4 448801.2 1779402 14445.6 2970567
>> dim(g)
> [1] 2 6
>> as.vector(g)
> ? Empfang ? Versand ?Transit ?Inland Ausland ? ?SumS
> 1 787844.0 1307176.6 223395.4 1474726 16199.1 3809341
> 2 421473.1 ?306445.4 448801.2 1779402 14445.6 2970567
>> gg=matrix(as.vector(g),nrow=1,byrow=TRUE)
>> gg
> ? ? [,1] ? ? ?[,2] ? ? ?[,3] ? ? ?[,4] ? ? ?[,5] ? ? ?[,6]
> [1,] Numeric,2 Numeric,2 Numeric,2 Numeric,2 Numeric,2 Numeric,2
>>
> ?Help please,the docu on thids is lousy!!!.
> Wolfgang
>
> ? ? ? ?[[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.
>

William Dunlap

2009-Aug-29 17:28 UTC

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[R] Numeric, 2 ??? as a result of marix???

> -----Original Message-----
> From: r-help-bounces at r-project.org 
> [mailto:r-help-bounces at r-project.org] On Behalf Of Wolfgang Polasek
> Sent: Friday, August 28, 2009 3:16 PM
> To: r-help at r-project.org
> Subject: [R] Numeric, 2 ??? as a result of marix???
> 
> Strange things are going on in R, if you reshape a matrix in R:
> > g=gretldata[1:2,]
> > g
>    Empfang   Versand  Transit  Inland Ausland    SumS
> 1 787844.0 1307176.6 223395.4 1474726 16199.1 3809341
> 2 421473.1  306445.4 448801.2 1779402 14445.6 2970567
> > dim(g)
> [1] 2 6
> > as.vector(g)
>    Empfang   Versand  Transit  Inland Ausland    SumS
> 1 787844.0 1307176.6 223395.4 1474726 16199.1 3809341
> 2 421473.1  306445.4 448801.2 1779402 14445.6 2970567
> > gg=matrix(as.vector(g),nrow=1,byrow=TRUE)
> > gg
>      [,1]      [,2]      [,3]      [,4]      [,5]      [,6]
> [1,] Numeric,2 Numeric,2 Numeric,2 Numeric,2 Numeric,2 Numeric,2
> >
This last printout is how R prints a matrix whose contents
are a "list".  Rouughly, if a list element has length 1 its value
is printed; otherwise its type and, usually, length are printed.
E.g.,
> z<-matrix(list(one=1, two=exp(0:1),
three=c("i","ii","iii"),
four=quote(log(x))), nrow=2)> z     [,1]      [,2]       
[1,] 1         Character,3
[2,] Numeric,2 Expression 

When you see a printout that you cannot interepret, try using the str()
function to print the object and you may be able to make sense of it.
> str(z)List of 4
 $ : num 1
 $ : num [1:2] 1 2.72
 $ : chr [1:3] "i" "ii" "iii"
 $ : language log(x)
 - attr(*, "dim")= int [1:2] 2 2

matrix(data.frame(...)) strips the attributes from the data.frame,
making
it a list, then attaches dimensions to the list, making an object like
'z'
above.  as.matrix(data.frame()) makes a matrix that is roughly
equivalent
to the data.frame input.

Bill Dunlap
TIBCO Software Inc - Spotfire Division
wdunlap tibco.com  
>  Help please,the docu on thids is lousy!!!.
> Wolfgang
> 
> 	[[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.
>

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