R tableGrob change format of row

Question

I have some relatively simple code to create a table for printing to a PDF:

library(gridExtra)
df <- head(iris)
tableGrob(df, gp = gpar(fontsize = 8), row         


        

Answer 1

You could edit the grobs, as suggested in the vignette

library(gridExtra)
g <- tableGrob(iris[1:4, 1:3])

edit_cell <- function(table, row, col, name="core-fg", ...){
  l <- table$layout
  ids <- which(l$t %in% row & l$l %in% col & l$name==name)
  for (id in ids){
  newgrob <- editGrob(table$grobs[id][[1]], ...)
  table$grobs[id][[1]] <- newgrob
  }
  table
}

g <- edit_cell(g, nrow(g), seq_len(ncol(g)), "core-fg", 
               gp=gpar(fontsize=15, fontface="bold"))
g <- edit_cell(g, nrow(g), seq_len(ncol(g)), "core-bg", 
               gp=gpar(fill="darkolivegreen1", 
                       col = "darkolivegreen4", lwd=5))

grid.newpage()
grid.draw(g)