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Re: Joining points of ListPlot

  • To: mathgroup at smc.vnet.net
  • Subject: [mg117331] Re: Joining points of ListPlot
  • From: Antonio Mezzacapo <ant.mezzacapo at gmail.com>
  • Date: Tue, 15 Mar 2011 06:05:46 -0500 (EST)

Yeah I think you are right Bob, maybe the attachment isn't reachable to
everyone.

I have uploaded the data here
http://www.easy-share.com/1914242675/AntonioListPlot.txt
<http://www.easy-share.com/1914242675/AntonioListPlot.txt>

Antonio

2011/3/14 DrMajorBob <btreat1 at austin.rr.com>

> I just checked every e-mail I have on this thread, and this is the first
> time I see an example.
>
> It's an attachment, besides, and attachments don't go to the group.
>
> Bobby
>
>
> On Mon, 14 Mar 2011 12:53:46 -0500, Antonio Mezzacapo <
> ant.mezzacapo at gmail.com> wrote:
>
>  I send you again an example of my data, as an attachment text; however I
>> already sent it in a preceeding email. Please pay attention.
>>
>> Note that there are crossing functions, in one array of points, that I
>> want
>> to join separetely.
>>
>> Thank you for care however,
>>
>> Antonio
>>
>> 2011/3/14 DrMajorBob <btreat1 at austin.rr.com>
>>
>>  A short, simple example is worth a thousand words. You're still not
>>> making
>>> yourself clear.
>>>
>>> Bobby
>>>
>>>
>>> On Mon, 14 Mar 2011 06:01:17 -0500, Antonio Mezzacapo <
>>> ant.mezzacapo at gmail.com> wrote:
>>>
>>>  Thank you for answering.
>>>
>>>>
>>>> I don't have any functional form of this points. I have only this array
>>>> of
>>>> points. Points on this array should be distributed *like* two crossing
>>>> functions as Sin[x] and Cos[x], but I don't know the functional form of
>>>> these functions.
>>>>
>>>> All that I have is an array of points!
>>>> Because of the fact that these points distribute on the x-y cartesian
>>>> plane
>>>> like two crossing functions, I cannot use "joined->true" because it
>>>> gives
>>>> me
>>>> strange results.
>>>>
>>>> Thank you
>>>> Antonio
>>>>
>>>> 2011/3/13 Michael Stern <nycstern at gmail.com>
>>>>
>>>>  Antonio,
>>>>
>>>>>
>>>>> Some points of your question are unclear, but perhaps this will cover
>>>>> all
>>>>> relevant cases.
>>>>>
>>>>> 1. If you have functions, the simplest way is:
>>>>>
>>>>> Plot[{Sin[x], Cos[x]}, {x, 0, 2*Pi}]
>>>>>
>>>>> 2. You refer to "joined points," however, which suggests that you may
>>>>> be
>>>>> dealing with lists of points rather than functions. If so, you can do
>>>>> the
>>>>> same thing as follows:
>>>>>
>>>>> (* creating the two lists *)
>>>>> s1 = Table[Sin[x], {x, 0, 2*Pi, .1}];
>>>>> c1 = Table[Cos[x], {x, 0, 2*Pi, .1}];
>>>>>
>>>>> (* plot *)
>>>>> ListPlot[{s1, c1}, Joined -> True]
>>>>>
>>>>>
>>>>> 3. You refer to the points not being ordered, from which I take that
>>>>> one
>>>>> or
>>>>> both of the lists of plots has cartesian coordinates, not ordered by
>>>>> the
>>>>> independent variable. In this case, you can use Sort or SortBy to put
>>>>> them
>>>>> in order.
>>>>>
>>>>> (* creating two cartesian lists, neither of which is 'ordered' by the
>>>>> definition above *)
>>>>> s2 = RotateLeft[Table[{x, Sin[x]}, {x, 0, 2*Pi, .1}]];
>>>>> c2 = RotateRight[Table[{x, Cos[x]}, {x, 0, 2*Pi, .1}]];
>>>>>
>>>>> (* plot by sorted versions of these unordered lists *)
>>>>> ListPlot[{SortBy[s2, First], SortBy[c2, First]}, Joined -> True]
>>>>>
>>>>>
>>>>> Does that help?
>>>>>
>>>>> Michael
>>>>>
>>>>>
>>>>> On Mar 13, 2011, at 6:25 AM, Antonio Mezzacapo wrote:
>>>>>
>>>>> > Hi,
>>>>> > here's my problem:
>>>>> >
>>>>> > I have an array of data depicting two crossing functions (let's say
>>>>> like
>>>>> > Sin[x] and Cos[x]). How can I arrange them and make a joined points
>>>>> plot,
>>>>> > that joins only points belonging to the same function?
>>>>> > I remember you that the points of the two crossing functions are on
>>>>> the
>>>>> same
>>>>> > array and they are non-ordered.
>>>>> >
>>>>> > Thank you
>>>>> >
>>>>> > Antonio Mezzacapo
>>>>> >
>>>>>
>>>>>
>>>>>
>>> --
>>> DrMajorBob at yahoo.com
>>>
>>>
>
> --
> DrMajorBob at yahoo.com
>


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