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Message-ID: <OFCFB42A95.9C501338-ON86257928.005C661F-86257928.005C7819@usgs.gov> Date: 2011-10-13T16:49:49Z From: Jean V Adams Subject: How to mean for groups of matrix rows? In-Reply-To: <CAEMKS7Eo62Tk_Ue6ewquVn=hHTy=HNgaw9bTbd2yqAVebdiHYw@mail.gmail.com> An embedded and charset-unspecified text was scrubbed... Name: not available URL: <https://stat.ethz.ch/pipermail/r-help/attachments/20111013/3b45827d/attachment.pl>