Re: How to get rid of the outer {}?
- To: mathgroup at smc.vnet.net
- Subject: [mg5534] Re: [mg5507] How to get rid of the outer {}?
- From: Allan Hayes <hay at haystack.demon.co.uk>
- Date: Thu, 19 Dec 1996 01:02:32 -0500
- Sender: owner-wri-mathgroup at wolfram.com
Zvi Wiener <mswiener at pluto.mscc.huji.ac.il>
>Subject: [mg5507] How to get rid of the outer {}?
writes
I wish to use a command like
Outer[ List, {0,1}, {0,1}, {0,1}, {0,1}]
but with 30 (or more) times {0,1} instead of four.
I can easily generate such a list by Table[ {0,1}, {30}]
however it has an additional {}. How I can use this list
in Outer?
Zvi:
a = Outer[List,{0,1}, {0,1}, {0,1}, {0,1}];
b = Outer[List,Sequence@@Table[{0,1}, {4}]];
c = Outer[List,##]&@@Table[{0,1}, {4}]l
a==b==c
True
General pattern:
A@@B[x,y] (full form Apply[A, B[x,y]]) -> A[x,y]
(head B replaced by A).
Allan Hayes
hay at haystack.demon.co.uk
http://www.haystack.denmon.co.uk