matrix operations
- To: mathgroup at smc.vnet.net
- Subject: [mg46329] matrix operations
- From: "paolo tarpanelli" <tarpanelli at libero.it>
- Date: Sat, 14 Feb 2004 22:19:40 -0500 (EST)
- Sender: owner-wri-mathgroup at wolfram.com
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 : aa={x[[2,1]]-x[[1,1]], x[[2,2]]-x[[1,2]],...,x[[2,n]]-x[[1,n]]} {x[[3,1]]-x[[2,1]], x[[3,2]]-x[[2,2]],...,x[[3,n]]-x[[2,n]]} . . . {x[[m,1]]-x[[m-1,1]],x[[m,2]]-x[[m-1,2]],...,x[[m,n]]-x[[m-1,n]]} ------------------------------------------------------------------------------------------------------ I built this code but it does not work r=Array[0,{m,n}] For[j=1,j=n,j++ r[[i,j]]=Table[a[[i+1,j]]-a[[i,j]],{i,1,m-1,1}]] thanks Paolo ----------------
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