[BioC] annotate histograms

[Janet L Smith]

Set the y-axis on your histogram to start at a negative value, then use segments to draw the lines.

hist (your_data, ylim=c(-10,100))
segments (15,-0, 15, -20, col="red")


Janet Smith
Research Scientist
Department of Biology
MIT
Building 68-540D
Cambridge, MA 02139
________________________________________
From: bioconductor-bounces at r-project.org [bioconductor-bounces at r-project.org] On Behalf Of Wendy Qiao [wendy2.qiao at gmail.com]
Sent: Tuesday, November 01, 2011 12:01 PM
To: bioconductor at r-project.org
Subject: [BioC] annotate histograms

Hi all,

I am plot the gene expression data using histograms. I want to mark the
expression of certain level of certain genes on the figure as shown in sure
here<http://nar.oxfordjournals.org/content/39/suppl_1/D1011/F1.expansion.html>.
Does anybody know how to add the red markers under bars.

Thank you in advance.

Wendy

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