[R] ggplot2-grid/viewport and PNG

[ashz]

Dear All,

The following code save my graphs as pdf:
pdf("j:/mix.pdf", width = 18, height = 16) 
 grid.newpage() 
 pushViewport(viewport(layout = grid.layout(3,1))) 
 vplayout <- function(x, y) 
 viewport(layout.pos.row = x, layout.pos.col = y) 
 print(Aplot, vp = vplayout(1, 1)) 
 print(Bplot, vp = vplayout(2, 1)) 
 print(Cplot, vp = vplayout(3, 1))
dev.off()

How can I save it in PNG and maintain the same graph structure?

Thanks


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