Graphics don't appear when nested in a loop or function.

Graphics don't appear when nested in a loop or function.

Graph code using Trellis graph functions runs successfully when run by itself, but no graphs are created when coded within a loop or function.


  You must explicitly use the print() function when creating Trellis graphs within a loop or function.  For example:

print(xyplot(Weight ~ Fuel|Type, data=fuel.frame))