Mathematica 9 is now available
Services & Resources / Wolfram Forums / MathGroup Archive
-----

MathGroup Archive 2008

[Date Index] [Thread Index] [Author Index]

Search the Archive

Re: Re: Making a lists with conditions

  • To: mathgroup at smc.vnet.net
  • Subject: [mg85756] Re: [mg85698] Re: Making a lists with conditions
  • From: Andrzej Kozlowski <akoz at mimuw.edu.pl>
  • Date: Thu, 21 Feb 2008 17:58:22 -0500 (EST)
  • References: <fpduuo$rd3$1@smc.vnet.net> <200802191203.HAA19554@smc.vnet.net>

Here is a way that seems sufficiently different from the others that I  
have seen to be pehraps worth posting:


list1 = {3.8, 3.85, 3.9, 3.95, 4., 4.05, 4.1};
list2 = {{3.85, 120}, {4.0, 111}, {4.1, 314}};

Union[list1 /. (x_)?NumberQ -> {x, $}, list2,  SameTest -> (First[#1]  
== First[#2] &)]/. $ -> 0

  {{3.8, 0}, {3.85, 120}, {3.9, 0}, {3.95, 0},
    {4., 111}, {4.05, 0}, {4.1, 314}}

Andrzej Kozlowski

> On Feb 18, 11:02 pm, Guillermo Sanchez <guillermo.sanc... at hotmail.com>
> wrote:
>> Dear group
>>
>> I have two list (list1:{a1, ...ai,  aj, ..., an}, list2:{{ai,
>> bi}, ..., {aj, bj}}.
>>
>> I wish to obtain a new list (list3} where be included all members of
>> list1 and list2. If elements ak is not included in list2 then write
>> {ak, 0}.
>>
>> Here is an example:
>>
>> list1 = {3.8,  3.85, 3.9,  3.95,  4., 4.05,  4.1};
>> list2 = {{3.85, 120}, { 4.0 , 111}, {4.1, 314}};
>>
>> ff[list1_, list2_] := =BFlist1, list2?
>>
>> Here is the ouput that I wist to obtain
>>
>> Out:={{3.8, 0} , {3.85`, 120}, {3.9`, 0}, {3.95, 0}, {4.`, 111},
>> {4.05`, 0}, {4.1`, 314}}
>>
>> I have a method but it is two complicate. I am sure that some members
>> of the group will find a elegant solution
>>
>> Thanks
>>
>> Guillermo



  • Prev by Date: RE: Extracting the value from Solve
  • Next by Date: Re: Extracting the value from Solve
  • Previous by thread: Re: Making a lists with conditions
  • Next by thread: Re: Making a lists with conditions