Sepp Gurgel wrote:

I have a table

Do you mean a data.frame?

with two columns, one with types of blood (A, B, AB or 0) and
one with the factor (negative = -1 or positive = 1).

And from these you made a table?

  my.table <- table(my.data.frame)


How can I combine those two columns so that 7 bars are plotted (A, B, AB, 0,
-A, -B and -0)?

Now you can say

  blood.id <- outer(rownames(my.table), colnames(m.ytable),
                    paste, sep="")
  barplot(as.vector(my.table), names = blood.id)

Uwe Ligges



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