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matrix columns

• To: mathgroup at smc.vnet.net
• Subject: [mg30247] matrix columns
• From: Aaron Urbas <aaurba2 at pop.uky.edu>
• Date: Fri, 3 Aug 2001 00:56:18 -0400 (EDT)
• Sender: owner-wri-mathgroup at wolfram.com

According to the mathematica book there are 2 ways to access columns of
a matrix (Mathmatica V. 3) Transpose[m][[i]] and Map[#[[i]]&,m].  Are
the efficiencies of these two operations the same. Also, I can't figure
out how you would assign a column in a matrix (i.e. set a column in the
matrix equal to a specific vector or something).  The two previously
mentioned functions return copies of the columns in the m and you can't
assign a new value to it as far as I can see.  Is this possible?

Thanks in Advance,
Aaron