Question: add cut off lines to volcano plot
gravatar for Sam
7 months ago by
Sam120 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 • 276 views
ADD COMMENTlink written 7 months ago by Sam120

refer to abline function in R.

ADD REPLYlink modified 7 months ago • written 7 months ago by cpad011211k

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 7 months ago by ATpoint22k

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 7 months ago by Charles Warden7.2k
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