  Hi,

Well, it works for me:

x <- matrix(1:20, nrow=5, ncol=4)
data.frame(x[1:5,2:4])
   X1 X2 X3
1  6 11 16
2  7 12 17
3  8 13 18
4  9 14 19
5 10 15 20

Maybe with as.data.frame(), or set the drop argument to FALSE:
data.frame(x[1:5,2:4,drop=FALSE])

Not sure why it doesn't work for you. Check the output of str(stocks1)

HTH,
Ivan

Le 9/16/2010 17:18, Leigh E. Lommen a écrit :
> First I have a matrix called stocks1:
>
>
>
>> class(stocks1)
> [1] "matrix"
>
>
>
> Here are the first 5 rows of the last 4 columns:
>
>> stocks1[1:5,2:5]
>        [,1]  [,2]  [,3]  [,4]
>
> [1,] 80.73 31.95 25.4  25.69
>
> [2,] 83.66 31.95 27.12 25.2
>
> [3,] 83.27 32.93 28.74 26.29
>
> [4,] 83.9  34.07 29.77 26.6
>
> [5,] 82.74 35.18 30.24 27.41
>
>
>
> Now, why can't I convert this into a dataframe?  It automatically
> converts the columns into 1 long row??
>
>> newdata.df<-data.frame(stocks1[1:5,2:5])
>> newdata.df
>     X1.1  X1.2  X1.3 X1.4  X1.5  X1.6  X1.7  X1.8  X1.9 X1.10 X1.11 X1.12
>
>
> 1 80.73 83.66 83.27 83.9 82.74 31.95 31.95 32.93 34.07 35.18  25.4 27.12
>
>
>
>    X1.13 X1.14 X1.15 X1.16 X1.17 X1.18 X1.19 X1.20
>
> 1 28.74 29.77 30.24 25.69  25.2 26.29  26.6 27.41
>
>
>
> Regards,
>
> Leigh
>
>
> 	[[alternative HTML version deleted]]
>
> ______________________________________________
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> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>

-- 
Ivan CALANDRA
PhD Student
University of Hamburg
Biozentrum Grindel und Zoologisches Museum
Abt. Säugetiere
Martin-Luther-King-Platz 3
D-20146 Hamburg, GERMANY
+49(0)40 42838 6231
ivan.calandra@uni-hamburg.de

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