Re: How to map a list on function
- To: mathgroup at smc.vnet.net
- Subject: [mg97539] Re: [mg97472] How to map a list on function
- From: Michael Stern <nycstern at gmail.com>
- Date: Sat, 14 Mar 2009 18:17:02 -0500 (EST)
- References: <200903141035.FAA12757@smc.vnet.net>
Your example is unclear - is your list format {x1,y1,z1,u1},{x2,y2,z2,u2}...{xn,yn,zn,un}}? If so, try Total[Map[#[[1]]*#[[2]]*#[[3]]*#[[4]]&,list]] Michael buts wrote: > Hello, > > Could anyone explain me how to do the following: > I have a long list of integer numbers in groups of four: > > list= {{10,3,5,7},{4,6,8,9},{0,8,3,6}, ...... } > > or its Flatten version. > > How to write a fast function g[list] which does this: > > g[list] =x^10*y^3*z^5*u^7 + x^4*y^6*z^8*u^9 + y^8*z^3*u^6+ ... > > It should be done many times (say, 10^4-6) on lists with length > 1000, so taking parts is not a good idea. > How to use Map or similar ? > Thanks. > >
- References:
- How to map a list on function
- From: buts <manger31@yahoo.com>
- How to map a list on function