Re: Joining points of ListPlot

*To*: mathgroup at smc.vnet.net*Subject*: [mg117289] Re: Joining points of ListPlot*From*: Antonio Mezzacapo <ant.mezzacapo at gmail.com>*Date*: Mon, 14 Mar 2011 05:58:53 -0500 (EST)

Ok now you've got the point, Michael. Yeah I was wondering if there was a smart way to achieve the result without writing an explicit algorithm to separates the curve, also because I have many of these arrays and I don't want my separating procedure to be very specific case-dependant. I guess I should not use Joined this time, it looks too complicated, and it doesn't worth the effort. Thank you anyway Antonio 2011/3/13 Michael Stern <nycstern at gmail.com> > Antonio, > > If I understand the data and what you want to achieve, you have data from > four separate functions that have been mixed together and you want to > separate the data and graph it, with each function colored differently. This > seems to be complicated by the facts that (1) it looks as though you may > have your data arranged in {dependent variable, independent variable} pairs, > the opposite of what would usually be the case, (2) some of the independent > variables are complex numbers, and (3) you have a nonsense number in the > list ( {}[400]). > > I'd remove the nonsense number by hand, then use the Select[] command to > separate the data for the four curves, using Selection criteria that you are > going to have to determine by plotting equations against the same axes as > your data. Once you have them separated you can graph them in any colors you > want. > > Sorry I can't do this four you, but it's going to take a bit of time. > > Send any follow-up to me directly. > > Thanks, > > Michael > > > > On Mar 13, 2011, at 12:40 PM, Antonio Mezzacapo wrote: > > Here's an example of my data. See that from one array one gets different > functions that i want to join separately. Try to join all the points and it > will do weird things. > > Antonio > > 2011/3/13 Michael Stern <nycstern at gmail.com> > >> The functional form was in the third example only to generate sample data. >> The plotting function worked perfectly for that sample data, and should work >> for your data as well. If you will share some of your data, I can be more >> explicit. What does your array look like? For example, is it {{function 1 >> point 1, function 2 point 1},{function 2, point 2, function 2 point 2} . . . >> } or is it {{function 1 point 1, function 1 point 2 . . . }, {function 2 >> point 1, function 2 point 2 . . . }}. Either one is easily handled, but you >> can't expect us to be psychic. >> >> Michael >> >> >> >> >> On Mar 13, 2011, at 11:17 AM, Antonio Mezzacapo wrote: >> >> Tha problem is that all points are on the same array, and I don't know the >> functional form they have, so i can't separate the two arrays like you did >> in your third example. >> It's like having Sin and Cos points on the same array, but they are not >> Sin and Cos, and I don't know their analytic form! >> >> AM >> >> 2011/3/13 Michael Stern <nycstern at gmail.com> >> >>> Can you provide an example of your data? Sorting by the independent >>> variable should give you the results you want, as in my third example. >>> >>> MS >>> >>> Sent from a mobile device. >>> >>> On Mar 13, 2011, at 8:24 AM, 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>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 >>>> > >>>> >>>> >>> >> >> > <AntonioListPlot.txt> > >

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**Re: Joining points of ListPlot**

**Re: Joining points of ListPlot**

**Re: Joining points of ListPlot**