Re: [R] problem understanding factor levels for use lattice panel order

2009-10-08 Thread Rolf Turner
On 9/10/2009, at 6:52 AM, Folkes, Michael wrote: Hello all, In order to get the desired order of panels within lattice I realized I needed to define my factor levels. I now see how to properly do it (attached code), but: 1. I don't understand why I have to use factor() on a variable that i

[R] problem understanding factor levels for use lattice panel order

2009-10-08 Thread Folkes, Michael
Hello all, In order to get the desired order of panels within lattice I realized I needed to define my factor levels. I now see how to properly do it (attached code), but: 1. I don't understand why I have to use factor() on a variable that is already a factor, and why levels() alone doesn't work