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MathGroup Archive 2007

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Re: split

  • To: mathgroup at smc.vnet.net
  • Subject: [mg73611] Re: [mg73572] split
  • From: Bob Hanlon <hanlonr at cox.net>
  • Date: Fri, 23 Feb 2007 04:30:04 -0500 (EST)
  • Reply-to: hanlonr at cox.net

The test should compare two adjacent elements (#1 and #2). You had it making the decision based on looking at only the first of the two elements.  (#) is equivalent to (#1).

 z= {1, 3, 2, 6, 4, 7, 5,1,7};

Split[z,#1<=3&&#2<=3||#1>3&&#2>3&]

{{1,3,2},{6,4,7,5},{1},{7}}


Bob Hanlon

---- Arkadiusz.Majka at gmail.com wrote: 
> Hi,
> 
> I want to split a list, say
> 
> z = {1, 3, 2, 6, 4, 7, 5,1,7};
> 
> into sublist of elements that are less or equal 3.
> 
> so I want to obtain
> 
> {{1,3,2},{6,4,7,5},{1},{7}}
> 
> How to do it? Probably by applying Split, but what to put in Test?
> 
> Split[z,#<=3&] gives :
> 
> {{1, 3, 2, 6}, {4}, {7}, {5}, {1, 7}}
> 
> Why 6 was put in first sublist together with 1, 3, and 2 since 6>3 and
> should be together with 4 in the second sublist?
> 
> Thanks,
> 
> Arek



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