Re: setting elements of an array based on a condition
- To: mathgroup at smc.vnet.net
- Subject: [mg87182] Re: setting elements of an array based on a condition
- From: Bill Rowe <readnews at sbcglobal.net>
- Date: Thu, 3 Apr 2008 05:16:33 -0500 (EST)
On 4/2/08 at 5:57 AM, szhorvat at gmail.com (Szabolcs Horv=C3=A1t) wrote: >Claus wrote: >>2) Then I want to calculate the sum of the elements in each column >>of W. How can I do this? >Plus @@@ W >or >Total /@ W For a 2 x 2 (W) matrix, your code will output W[[1,1]]+W[[1,2]] and W[[2,1]]+W[[2,2]] I believe the requester is asking for B[[1,1]]+B[[2,1]] and B[[1,2]]+B[[2,2]] For that you would want to use Total[W] or Plus@@@Transpose[W]