A little help with sort
- To: mathgroup at smc.vnet.net
- Subject: [mg112494] A little help with sort
- From: "Blackwell, Keith" <Keith.Blackwell at rbccm.com>
- Date: Fri, 17 Sep 2010 06:42:23 -0400 (EDT)
The problem I am having: Let's say I have a 200 x 200 matrix. I want to sort it in order of the values in column one. Then I want it to sort all the doubles by the values in column two. Then I want it to sort all the double doubles by reverse of the values of column 4 or whatever. Is there an easy way to do this. I know I can write something long and annoying to do it, but I'm getting to the point in my use of mathematica where I want to write more concise code. Sort[Matrix, #1[]>#2[]&] seems to totally negate any pre sorting... I tried to fold it backwards starting from column 4 and it seems that sort just ignores whatever I do then. Thanks in advance, Keith ________________________________________ This E-Mail (including any attachments) may contain privileged or confident= ial information. It is intended only for the addressee(s) indicated above. The sender does not waive any of its rights, privileges or other protection= s respecting this information. Any distribution, copying or other use of this E-Mail or the information it= contains, by other than an intended recipient, is not sanctioned and is pr= ohibited. If you received this E-Mail in error, please delete it and advise the sende= r (by return E-Mail or otherwise) immediately. This E-Mail (including any attachments) has been scanned for viruses. It is believed to be free of any virus or other defect that might affect an= y computer system into which it is received and opened. However, it is the responsibility of the recipient to ensure that it is vir= us free. The sender accepts no responsibility for any loss or damage arising in any = way from its use. E-Mail received by or sent from RBC Capital Markets is subject to review by= Supervisory personnel. Such communications are retained and may be produced to regulatory authorit= ies or others with legal rights to the information. IRS CIRCULAR 230 NOTICE: TO COMPLY WITH U.S. TREASURY REGULATIONS, WE ADVI= SE YOU THAT ANY U.S. FEDERAL TAX ADVICE INCLUDED IN THIS COMMUNICATION IS N= OT INTENDED OR WRITTEN TO BE USED, AND CANNOT BE USED, TO AVOID ANY U.S. FE= DERAL TAX PENALTIES OR TO PROMOTE, MARKET, OR RECOMMEND TO ANOTHER PARTY AN= Y TRANSACTION OR MATTER.