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MathGroup Archive 2003

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RE: List Operation ?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg40217] RE: [mg40204] List Operation ?
  • From: "David Park" <djmp at earthlink.net>
  • Date: Wed, 26 Mar 2003 02:42:18 -0500 (EST)
  • Sender: owner-wri-mathgroup at wolfram.com

Sunil,

We seem to be getting list questions today, and Mathematica is great at
manipulating lists.

For your example...

data = Table[{a[i], b[i], c[i], d[i], e[i], f[i]}, {i, 1, 5}]
{{a[1], b[1], c[1], d[1], e[1], f[1]},
 {a[2], b[2], c[2], d[2], e[2], f[2]},
 {a[3], b[3], c[3], d[3], e[3], f[3]},
 {a[4], b[4], c[4], d[4], e[4], f[4]},
 {a[5], b[5], c[5], d[5], e[5], f[5]}}

Just Map (/@) the pure function that picks out the 1st, 2nd and 4th parts of
an expression, onto the data list.

Part[#, {1, 2, 4}] & /@ data
{{a[1], b[1], d[1]},
 {a[2], b[2], d[2]},
 {a[3], b[3], d[3]},
 {a[4], b[4], d[4]},
 {a[5], b[5], d[5]}}

David Park
djmp at earthlink.net
http://home.earthlink.net/~djmp/


From: Sunil Jayatilleke [mailto:sunilj at physics.uc.edu]
To: mathgroup at smc.vnet.net


I have a list as follows

list1 =
{{a1,b1,c1,d1,e1,f1},{a2,b2,c2,d2,e2,f2},{............}.............}

Now I want to do the following

list2 ={{a1,b1,d1},{a2,b2,d2}......................}

How can I do that ?

thanks

SJ




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