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MathGroup Archive 2006

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Re: RandomList and pure function

  • To: mathgroup at smc.vnet.net
  • Subject: [mg70858] Re: [mg70833] RandomList and pure function
  • From: Bob Hanlon <hanlonr at cox.net>
  • Date: Mon, 30 Oct 2006 05:32:18 -0500 (EST)
  • Reply-to: hanlonr at cox.net

lis=Array[a,{4,2}];

Your function's argument (a row) is a single list of length 2.

ans=(#[[1]]+2 #[[2]])&/@lis

{a[1, 1] + 2*a[1, 2], a[2, 1] + 2*a[2, 2], a[3, 1] + 2*a[3, 2], 
  a[4, 1] + 2*a[4, 2]}

Alternatively, this can be written

ans==({1,2}.#&)/@lis

True


Bob Hanlon

---- Marc VIAL <marcvial at msn.com> wrote: 
> 
> Hi,
> 
> Sorry for this naive question, but I try to apply a pure function of 2 arguments to a list of n rows with 2 clm using the mapping function:
> 
> n=100;lis=RandomReal[{0,1},{n,2}];
> (#1+2 #2)&/@lis
> 
> however it only captures the first term in the list and leave #2 unassigned.
> 
> Any advice?
> 
> Thanks
> Marc
> _________________________________________________________________
> 
> 

--

Bob Hanlon
hanlonr at cox.net



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