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Re: need help

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  • Subject: [mg87325] Re: need help
  • From: dh <dh at>
  • Date: Tue, 8 Apr 2008 05:33:33 -0400 (EDT)
  • References: <ftcoug$ksr$>

Hi Tomi,

for random numbers, see RandomInteger or RandomReal in the manual. They 

can generates lists.

The function can be written e.g. as:







here we used that the sum of squares is n, that 0<=xi, we sorted xi 

ascending and we request that x must be integers. Finally Reduce does 

the actual work.

hope this helps, Daniel

haitomi wrote:

> 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


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