[R] trouble in (scan -- read.table)

[Jonathan Baron]

On 05/05/02 16:21, hkimscil wrote:
>Hello all -
>I must be wrong in using commands...  

Yes.  scan() reads data horizontally, but matrix() fills up one
column at a time starting at the left.  You can change the
behavior of matrix() with byrow=T.

>The below is my data (test.data). Its size is 10 X 15.
>1 1 1 1 1 1 0 1 1 1 1 1 0 1 0
>1 1 1 0 0 1 0 0 0 1 0 0 1 1 1
>1 1 1 0 0 1 0 1 0 0 0 1 1 1 1
>0 0 0 0 1 1 0 0 0 1 1 0 0 1 1
>1 1 1 1 0 1 0 1 0 1 0 0 0 1 1
>0 1 0 0 0 1 0 0 0 1 1 0 1 0 0
>1 1 0 1 0 1 1 1 0 0 1 0 1 0 0
>1 1 0 1 0 1 1 1 0 1 0 1 1 0 0
>0 1 1 1 1 1 1 0 1 1 0 1 1 0 0
>1 1 0 0 0 1 0 0 1 0 1 1 1 0 0
>
>I am importing the data into a matrix test1, using scan.
>> test1<-matrix(scan("test.data"),nrow=10,ncol=15)

This should work if you say
test1<-matrix(scan("test.data"),nrow=10,ncol=15,byrow=T)

>Then, I do the same thing with read.table
>> test2<-as.matrix(read.table("test.data"))
>
>Now, test1 and test2 are different (test2 is the correct one).
>
>test1:
>1 1 1 1 0 1 1 0 1 1 1 1 0 0 1
>1 1 0 1 1 0 1 0 0 1 0 1 1 1 0
>1 0 0 1 1 0 1 0 0 0 1 1 1 1 0
>1 1 0 0 1 0 1 1 0 1 0 0 1 0 1
>1 0 1 0 1 1 0 1 1 0 0 1 1 0 0
>1 1 0 1 0 1 1 0 1 1 1 0 1 1 1
>0 1 0 0 0 0 0 1 0 1 1 1 1 1 1
>1 1 1 1 0 0 1 0 1 1 0 1 0 0 1
>1 0 1 0 0 1 0 0 0 0 1 0 1 0 0
>1 0 1 0 1 1 1 0 0 0 0 0 1 0 0
>
>test2
>1 1 1 1 1 1 0 1 1 1 1 1 0 1 0
>1 1 1 0 0 1 0 0 0 1 0 0 1 1 1
>1 1 1 0 0 1 0 1 0 0 0 1 1 1 1
>0 0 0 0 1 1 0 0 0 1 1 0 0 1 1
>1 1 1 1 0 1 0 1 0 1 0 0 0 1 1
>0 1 0 0 0 1 0 0 0 1 1 0 1 0 0
>1 1 0 1 0 1 1 1 0 0 1 0 1 0 0
>1 1 0 1 0 1 1 1 0 1 0 1 1 0 0
>0 1 1 1 1 1 1 0 1 1 0 1 1 0 0
>1 1 0 0 0 1 0 0 1 0 1 1 1 0 0

-- 
Jonathan Baron, Professor of Psychology, University of Pennsylvania
Home page: http://www.sas.upenn.edu/~baron
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