Re: matrix operations

*To*: mathgroup at smc.vnet.net*Subject*: [mg46425] Re: matrix operations*From*: Paul Abbott <paul at physics.uwa.edu.au>*Date*: Tue, 17 Feb 2004 07:05:57 -0500 (EST)*Organization*: The University of Western Australia*References*: <c0mohe$65t$1@smc.vnet.net>*Sender*: owner-wri-mathgroup at wolfram.com

In article <c0mohe$65t$1 at smc.vnet.net>, "paolo tarpanelli" <tarpanelli at libero.it> wrote: > If I have a matrix > > a={x[[1,1]],x[[1,2]],...,x[[1,n]]} > {x[[2,1]],x[[2,2]],...,x[[2,n]]} > . > . > . > {x[[m,1]],x[[m,2]],...,x[[m,n]]} > > how can I compute the difference between any element and the previous for > each column : ListConvolve is your friend: ListConvolve[{{1}, {-1}}, a] Cheers, Paul -- Paul Abbott Phone: +61 8 9380 2734 School of Physics, M013 Fax: +61 8 9380 1014 The University of Western Australia (CRICOS Provider No 00126G) 35 Stirling Highway Crawley WA 6009 mailto:paul at physics.uwa.edu.au AUSTRALIA http://physics.uwa.edu.au/~paul