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need help

• To: mathgroup at smc.vnet.net
• Subject: [mg87308] need help
• From: haitomi <tpnycity at yahoo.com>
• Date: Mon, 7 Apr 2008 05:17:26 -0400 (EDT)

Hello All,

I need help with two pure functions

1)  Li[Ranlist,x] that return a list of x element selected at random from Ranlist.  (Is there any way to gennerate random from Ranlist? For example I have RanList=Range[-100,100])

2) the function 4Sumf[x] is computing the sum of 4 squares of x. If I have x=1, this function will gennerate 1^2+0^2+0^2+0^2, if x=4 then 2^2+0^2+0^2+0^2, if x=7 then 2^2+1^2+1^2+1^2

Is anyone out there have any ideas?
Thanks All,
Tomi