I want to make a stacked bar plot with one bar for two variables from my
data "chir", the two variables have about 100 values like no, yes and na. I
want to show how many no, yes and na they both have together with the
stacked bar. I tried to melt these to variables first like this:

melt1=melt(data_chir, measure.vars=c("N1_re", "N2_re"), var="zpd")

but it says " arguments imply differing number of rows: 98, 196"


maybe there is another way to make the plot without melt?

thanks in advance!

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