[R] Problem with List() Inside Function

[Patrick Burns]

My solution when I run into mysteries like this
is to put

browser()

in the function just before or after the line of interest.
The magnitude and direction of my stupidity usually
become clear quickly.

Patrick Burns
patrick at burns-stat.com
+44 (0)20 8525 0696
http://www.burns-stat.com
(home of S Poetry and "A Guide for the Unwilling S User")

Peter Lauren wrote:

>I have a function declared thus.
>FirstEigenvectorBoundary.Training <-
>function(InputFileName='C:/Samples2/PT_Amp.txt',
>Header=TRUE, Colour="red")
>
>Inside the function, I have the following call
>
>out<-list(x=Eigenvectors[2:(NumMetricsSelected+1),1],
>y=-0.8, z=NumMetricsSelected);
>
>NumMetricsSelected has the value 2 and Eigenvectors
>has the following form
>           [,1]       [,2]       [,3]
>[1,]  0.6404630 -0.2153989  0.7371638
>[2,] -0.6081319  0.4439621  0.6580830
>[3,]  0.4690231  0.8697706 -0.1533503
>
>When I do it manually at the console, I get the
>correct result.  I.e.
>  
>
>>out
>>    
>>
>$x
>[1] -0.6081319  0.4690231
>
>$y
>[1] -0.8
>
>$z
>[1] 2
>
>However, when I call the function like this
>  
>
>>Training<-FirstEigenvectorBoundary.Training()
>>    
>>
>
>I get
>  
>
>>Training
>>    
>>
>$x
>[1] 0.658083
>
>$y
>[1] -0.8
>
>$z
>[1] 2
>
>That is, the $x element has only one value (instead of
>2) and it is from the wrong part of the matrix.
>
>Can anyone see what I am doing wrong?
>
>Thanks very much,
>Peter.
>
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