Re: Joining points of ListPlot

• To: mathgroup at smc.vnet.net
• Subject: [mg117325] Re: Joining points of ListPlot
• From: DrMajorBob <btreat1 at austin.rr.com>
• Date: Tue, 15 Mar 2011 06:04:41 -0500 (EST)

```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
>
> 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:
>>
>>>
>>> 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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