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MathGroup Archive 2006

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Re: List Manipulation

  • To: mathgroup at smc.vnet.net
  • Subject: [mg72463] Re: List Manipulation
  • From: "Ray Koopman" <koopman at sfu.ca>
  • Date: Fri, 29 Dec 2006 05:27:50 -0500 (EST)
  • References: <emo866$g29$1@smc.vnet.net><200612271059.FAA21974@smc.vnet.net>

Andrzej Kozlowski wrote:
> Note that there are many cases for which this will not work, e.g.
>
>
> {5*k, 6, 78+4I*k+12*k} /.{a_+b_*k->{a,b}}
>
>
> {5 k,6,{78,12+4*I}}
>
> Andrzej Kozlowski
>
>
> On 27 Dec 2006, at 19:59, Arkadiusz.Majka at gmail.com wrote:
>
>> In[13]:=
>> {2+5*k, 6+2*k, 78+12*k} /.{a_+b_*k->{a,b}}
>>
>> Out[13]=
>> {{2,5},{6,2},{78,12}}
>>
>> A.
>>
>>
>>
>> Stratocaster napisal(a):
>>> I'm not sure if the following is possible or whether it exists
>>> somewhere
>>> between the realms of fantasy and science fiction.  I have been
>>> unable to do
>>> it.
>>>
>>> Given a list, set, vector (whatever you want to call it)
>>> consisting of
>>> functions of the same variable, i.e.
>>>
>>> list = {a1+b1*k, a2+b2*k, a3+b3*k...}
>>>
>>> Assuming they are all linear (of the form a+b*k) is there away to
>>> isolate
>>> the a_i and b_i values?  Essentially I would like to get a list "A"
>>> consisting of all the intercept values, and a list "B" consisting
>>> of all the
>>> slope values.
>>>
>>> Is this possible?  What kind of operations do I need to use to
>>> accomplish
>>> this (if indeed it is possible)?
>>>
>>> Thanks for any insights.
>>

I was assuming, on the basis of a thread in a different newsgroup,
that the terms in list were produced by Fit.


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