Help with axis and tick marks

[Kim Jung Hwa]

Hi All,

I need some help with:

1. Changing colour=black for ticks marks on circle outline (currently
its white).
2. Removing numeric label "1" which is appearing on y-axis of
following pie chart.

# R Code
library(ggplot2)
pg <- ggplot(as.data.frame.table(VADeaths), aes(x = factor(1), y =
Freq, fill = Var1)) +
geom_bar(width = 1) +
facet_wrap(~Var2, scales = "free_y") +
coord_polar(theta = "y") +
opts(panel.grid.major = theme_blank())
print(pg)

Thanks in advance,
Kim

[Dennis Murphy]

Hi:

I can help remove the labels on the y-axis and change the title on the legend,
but I don't know how to change the tick marks on the pie to black (and I'm not sure
you want to, because it will interfere with the numeric labels...but I digress).

I prefer to set the 'scaffolding' of the plot first and save it to an object:

pg <- ggplot(as.data.frame.table(VADeaths),
                  aes(x = factor(1), y = Freq, fill = Var1))

# Then,

pg + geom_bar(width = 1) +

      facet_wrap(~Var2, scales = "free_y") +
      coord_polar(theta = "y") +

      scale_fill_hue("Age group") +                            # change legend title
      opts(panel.grid.major = theme_blank(),
           axis.text.y = theme_blank(),                        # remove y axis label
           axis.ticks = theme_blank()) +                      # remove y axis tick marks
      xlab("") + ylab("")                                             # remove pointless axis titles

This still leaves you with the problem of getting the color you want on the circumference
tick marks, but hopefully someone else can edify you on that point.

HTH,
Dennis

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[Charlotte Wickham]

To get the ticks black:

last_plot() + opts(panel.grid.minor = theme_line(colour = "black")

But Dennis is right, it interferes with the labels.

Charlotte

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