stacked barplot in greyscale

[tcskurski]

I am wondering how to create a stacked barplot in greyscale instead of
color.
If anyone knows please use the example code to show how to modify to
greyscale.
qplot(factor(cyl), data=mtcars, geom="bar", fill=factor(gear))

Thanks!

[baptiste auguie]

last_plot() +
scale_fill_grey()

HTH,

baptiste

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