Question: add cut off lines to volcano plot
gravatar for Sam
16 months ago by
Sam140 wrote:

Dear all

I got the volcano plot of deseq2 output with this code :

 with(res, plot(log2FoldChange, -log10(pvalue), pch=20, main="Volcano plot", xlim=c(-8,8)))
with(subset(res, padj<0.1 ), points(log2FoldChange, -log10(pvalue), pch=20, col="red"))
with(subset(res, abs(log2FoldChange)>1), points(log2FoldChange, -log10(pvalue), pch=20, col="orange"))
 with(subset(res, padj<0.1 & abs(log2FoldChange)>1), points(log2FoldChange, -log10(pvalue), pch=20, col="green"))
with(subset(res, padj<0.1 & abs(log2FoldChange)>1), textxy(log2FoldChange, -log10(pvalue), labs=Geneid, cex=.8))

but I want add the cut off lines (padj and log2FoldChange) to the plot, any help for the code?


volcano plot • 595 views
ADD COMMENTlink written 16 months ago by Sam140

refer to abline function in R.

ADD REPLYlink modified 16 months ago • written 16 months ago by cpad011213k

Hello Sam!

We believe that this post does not fit the main topic of this site.

Basic R question. Please search the web and especially Stack Exchange.

For this reason we have closed your question. This allows us to keep the site focused on the topics that the community can help with.

If you disagree please tell us why in a reply below, we'll be happy to talk about it.


ADD REPLYlink written 16 months ago by ATpoint35k

I respectfully disagree - where there are other ways to learn about the abline() function, this looks like a perfectly appropriate question for Biostars.

ADD REPLYlink written 16 months ago by Charles Warden7.7k
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