Hello,

I have a list with gene names, fold changes (=expression level) and
chromosomes.

Names   fold change  chromosome
hz          1.5              2


If I plot fold change versus chromosome (or vice versa):

plot (ch, fc)

I see only the chromosomes with numbers but not those with letter (x and
y). What can I do?

A second question:
How can I add a single line in that plot at a certain y-level.

Thanks
Hermann

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