[R] Lattice bwplot(): Conditioning on one factor

[Rich Shepard]

On Fri, 28 Sep 2012, David Winsemius wrote:

> bwplot(quant ~ param , data=mg.d, main='Magnesium', ylab='Concentration
> (mg/L)', subset= era=='Pre-mining' )

David, Don:

   Thank you. I tried subset= and era== separately, not together.

   Now I know.

Much appreciated,

Rich