r - Graph does not show after type lattice command -

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I installed the package forged , and typed xyplot () . There is no error message, but no graph shows I tried switching to plot () and it works well, why did any thoughts happen? Thanks!

try it: 

  requires (forged) Required (statistics) Depth & lt; - equal count (quakes $ depth, number = 8, overlap = .1) my_plot & lt; - xyplot (lat ~ long | depth, data = quakes) print (my_plot)   
 Thank you for Amiramorisro and Gavin Simpson.

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