graphics - Changing margins of R vcd ternaryplot() -


i'm using ternaryplot() in r's vcd package make ternary plot. i'm trying rid of margins , make plot fill of plotting area.

using par() before ternaryplot() call doesn't work. documentation states this:

**usage**  ternaryplot(x, scale = 1, dimnames = null,   dimnames_position = c("corner","edge","none"),   dimnames_color = "black", id = null, id_color = "black",   id_just = c("center", "center"),   coordinates = false, grid = true, grid_color = "gray",   labels = c("inside", "outside", "none"),   labels_color = "darkgray", border = "black", bg = "white",   pch = 19, cex = 1, prop_size = false, col = "red",   main = "ternary plot", newpage = true, pop = true,   return_grob = false, ...)  **arguments**  ... additional graphics parameters (see par)

so there option add "additional graphics parameters" controlled par(), can't figure out how it. example, if use oma = c(0,0,0,0) this:

error in grid.polygon(c(0, 0.5, 1), c(0, top, 0), gp = gpar(fill = bg,  :    unused argument (oma = c(0, 0, 0, 0))


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