2 messages · Thomas Lumley, Martin Wegmann
hello Berwin, thanks for your help, I haven't considered this x-naming problem (pretty stupid mistake :-) ) - now it is working.
Because I can't keep track of this sort of thing I like to use with() rather than attach() when there isn't a data= argument. x<-with(diabetes, lars(x,y)) doesn't cause the same problem. -thomas
hello Berwin, thanks for your help, I haven't considered this x-naming problem (pretty stupid mistake :-) ) - now it is working. cheers to Oz, Martin
G'day Martin,
"MW" == Martin Wegmann <baliola at riseup.net> writes:
MW> I tried to use lars() but neither with my own data nor with
MW> the sample data it works. I get in both cases the following
MW> error prompt:
>> data(diabetes)
>> par(mfrow=c(2,2))
>> attach(diabetes)
>> x<-lars(x,y)
Works for me. But this is not a good style because it creates an
object with the name "x" in you local working directory. In
subsequent calls that "x" will be found before the "x" that is in the
frame where the diabetes data is attached (I am probably using the
wrong terminology here).
Better say something like
fm <- lars(x,y)
MW> due to the prompt "requires numeric matrix..." I changed the
variables to MW> matrix/vector or used different columns but it doesn't
work either. Probably you created variables called "x" in your working area
that are found first. And that variable are not numeric. Did you try
"rm(x)" or, more extreme, "rm(list=ls())" before running the lars
command?
MW> what does "error in one %*%x mean?
%*% is the R operator for matrix multiplication. It requires a
numeric arguments, either two matrices, or a matrix and a vector,
or....
Obviously, the writer of the lars package define a vector/matrix with
the name one which is multiplied at some point in the code with the
vector/matrix x. You get the error because one of the two is not a
numeric vector/matrix, presumably x.
Hope that helps.
Cheers,
Berwin
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