r - changing multiple line title in multiplot ggplot2 using grid.arrange

Question

I have followed the advice on the discussion

changing title in multiplot ggplot2 using grid.arrange

but my 2-line title doesn't change the font size.

1- should I state main in grid.arrange or do I use grid.arrange without main and then, add the following script

main=textGrob(paste("titleLine1", "titleLine2", sep = "
"),gp=gpar(fontsize=20))

Thanks

Carol

Answer 1

Here's one possibility,

library(grid); library(gridExtra)
tg <- textGrob("Title Goes Here", gp=gpar(fontsize=30))
sg <- textGrob("more subtle subtitle ", gp=gpar(fontsize=15, fontface=3L))
margin <- unit(0.5, "line")
grid.newpage()
grid.arrange(tg, sg, rectGrob(), 
             heights = unit.c(grobHeight(tg) + 1.2*margin, 
                              grobHeight(sg) + margin, 
                              unit(1,"null")))