@Rojo ultimately this is what I am trying to do (currently). mathematica.stackexchange.com/q/30645 I have added bounty in hopes someone better with Mathematica might see a way.

For anyone interested, this link comes via mathgroup and is about a internship: pecsim.ch/aboutus/news/internship-software-developer

@rm-rf online?

@Liam The bounty is of no use, when it is not possible to understand what you are trying to do generally. Is Rep the same as repr?? What are the 3 functions supposed to do?

one cross-posting with the community site was removed (mathematica.stackexchange.com/questions/30668/…) - I am just curious why, because I seem to remember an answer was posted at the time?

@YvesKlett Do you see the comments of the (deleted) questions?

@halirutan no - not enough rep

@YvesKlett The OP wrote: "I think the participants of this website should be more professional!!!. That is why I have to delete my account from your website!!"

What the heck. He writes an awful question and then this..?

@halirutan oh dear...

but someone answered, no?

he got a load of answers here: community.wolfram.com/groups/-/m/t/99538?p_p_auth=8JqXMTFU

@YvesKlett Yes, blackbird answered.

@YvesKlett Yes, Nasser already pointed this out in the comments of his question.

and I think @Nasser did point out there that it already been answered on MMA.SE - but I cannot find his comment/answer anymore

Did not look into the answer, but it seems impolite to blackbird to dump his answer as well.

@YvesKlett I just heared a beep.

oh, the cross posting thing :)

@Nasser hi there!

yup

Did you remove the comment from the community thread?

hi. Yes, too many cross postings !

it is ok, if they just mention it.

agreed. Obviously the OP did not really cherish the advice, though.

my new demo! I spend all day on this one. finite difference formula generator for different functions and different order:

I like math programming :)

@rm-rf I don't really need to have a specific objective function, as long as all the constraints are satisfied. You are saying to consider any objective function?

@YvesKlett I'm here now

@rm-rf thnx for getting back ;-)

was meaning to ask about the context question you answered a few hours ago

@YvesKlett Oh, what about it? (I did see your deleted comment)

@rm-rf I saw what you suggested, similarly to what DanielLichtau suggested. I am now running stuff ;) thanks

but that is already settled. I downvoted, saw your answer and wanted to undownvote

@Sosi Oh, good. Everything working now?

but editing the tags helped nicely ;-)

@YvesKlett ;)

@rm-rf what is your take on cross-postings with community?

Usually MWE helps, but in this case, it was fairly well written (except for the MWE) and I had the exact same problem when developing one of my packages, so I knew right away what his issue was

@rm-rf hopefully yes. I am getting NMinimize::incst: errors, but it may be because I'm considering a too wide span for the two parameters

@rm-rf that should teach me to simply wait and not communicate my ignorance too blatantly.

@YvesKlett We can't stop people from posting where ever they want and folks in desperate need of an answer will spam everywhere. I think posting is fine as long as they acknowledge that it has been cross-posted, so that people can check Community to see if it has been answered or not (or perhaps provide a better answer). It's not ideal, but I think it's a good solution

@rm-rf yes, I agree with Szab´s meta answer on that. We were musing about people feeling alienated by that bit of advice here

I saw that... if they have skin that thin, they shouldn't be on the internet :P

btw, @YvesKlett @halirutan the cross-posting was not removed intentionally... The user requested deletion by email. For low rep users, when a moderator deletes them, all negatively voted questions are automatically deleted as well.

@rm-rf o.k., another SE factoid ;-)

Normally I'd undelete it, but I can't make sense of the question or if the answer actually answers the question... both users seemed confused. Perhaps better to leave it be, I suppose

sage advice.

I think the user is just too new to Mathematica and they didn't get the same level of handholding here that they did at WC

I do not envy them that part - several question seem ... taxing.

They first asked this, then after Richard's first answer, they asked this by simply copy-pasting the first answer they got at WC... I don't know if their goal was to switch back and forth so that they don't ask it all at one place, but the question here ended up being closed

@rm-rf still got no 10k, so no joy.

I think closing quickly is more "humane"... we told them right away that their question was unresearched/low quality (things they could fix) rather than dragging it out, explaining bit by bit and eventually forgetting about them when they get too naggy, making them wait forever because no one wants to answer.

@YvesKlett Work harder :D

Seems fair. And better for the site in the long run.

Only 4k more to go

yay yay just 4k (who´s a-cheering?)

You can make that your Christmas present — privilege to view deleted crap on the site ;)

crap for christmas - now there´s a novelty :-)

@rm -rf You sure not coming to the tech conf this year?

@YvesKlett Definitely not coming

pity!

Oct-Nov is a terribly busy time for me :(

Hunting turkey?

Ha, I wish!

Perhaps we can have another take on getting attendees to confess. Not sure myself, but there are bound to be some candidates.

I'll ping SE to see if they'll provide any support this year as well

How was your experience with SE last year?

Yes, let´s!

Very good experience - no fuss!

Perhaps we can drag @halirutan overseas, just to cure his travelophobia :-)

Oh, it's 21–23... Hmm.

yes, they changed the week (to my chagrin)

Hello! Anyone could help me with dynamic Graphs?

I always run into inconsistencies of the new Graph representation...

Can someone check this out? I don't understand what the guy wants...

@Sosi I guess he wants datapoints in the form of Table[x[t]/.sol, {t, 0, 20, 0.1} ]

@IstvánZachar but he already has such a list under data

Indeed. Then data is the answer : )

I think I understood. His own function is different

now, what I dont understand, is what sol[x_,y_]:= is in his own code

@Sosi Yes, I see now, he edited in his 2 variable function

ya, but if x and y are dependent variables, what is he computing with sol[x_,y_]:?

@Sosi it is h

Well, the simple answer is that he hasn't followed the doc example properly... they extract the function with First[x /. NDSolve[..., whereas he hasn't done that.

@rm-rf yeah, now I understood

From his initial example I was seeing no problem

too bad I can only help in these very simple problems... :\

@YvesKlett The correct term is: Travelhateia.

@halirutan ;-)

Fear of traveling: Hodophobia

@YvesKlett Ahh, and btw: I was coming back yesterday from a week family-vacation!

and let´s not talk about the german associatons evoked by that term :-)

@halirutan Brandenburg?

@YvesKlett I believe it is Schleswig-Holstein. We were in/at the Ostsee.

just kididng of course. Hope you had a good time!

@YvesKlett I could have taken by fried Doerte as motivator ;-)

Yes, weather was nice and the hotel was awesome.

"wenn man zur Ostsee will, muss man durch Brandenburg" :-)

OK, enough chit-chat. Need to warm up for rehearsal. Later.

Have fun!

Guys, if I want a ContourPlot where one of the axis goes from -21 to -18, -18 to -15, etc.

How can I specify this inside the ContourPlot function, given that the intervals are the following

Flatten[{k, #}] & /@ Partition[Range[-21, -15, 3], 2, 1]

I tried a map, but that didnt work

sorry, that's Flatten[{k, #}] & /@ Partition[Range[-21, 3, 3], 2, 1]

I tried ContourPlot[mystuff, {k,#1,#2},{k2,0,9}]&/@Partition[Range[-21, -15, 3], 2, 1] but didn't work

This seems fairly trivial, but I'm not seeing how this can be done

@Sosi I'm not sure I understand. Do you mean this?:

ContourPlot[{Abs[Sin[x] Sin[y]] == 0.5, Abs[Cos[x] Cos[y]] == 0.5}, {x, -12, 12}, {y, -21, 3}, FrameTicks -> {Automatic, Range[-21, 3, 3]}]

something really should be done about duplicated questions on here and other forum without mentioning it. mathematica.stackexchange.com/questions/30878/… has been asked on Community, and many have helped there. Asking the same question here without even mentioning this will end up wasting time.

@Mr.Wizard I have been trying to use the method you showed in the link to this question: mathematica.stackexchange.com/questions/30838/… but I am not able to get similar result. I must not be using your method correctly. Can you please let me know what I am doing wrong. Here is the code:

original = {{55.3346, 694.253}, {55.3373, 691.275}, {55.34,
    688.323}, {55.3426, 685.396}, {55.3453, 682.494}, {55.348,
    679.617}, {55.3506, 676.765}, {55.3533, 673.936}, {55.356,
    671.131}, {55.3565, 668.277}, {55.3565, 665.428}, {55.3565,
    662.604}, {55.3565, 659.803}};
originalUnion = Union[original, SameTest -> (#1[[1]] == #2[[1]] &)];
fUnion = Interpolation[originalUnion, InterpolationOrder -> 1];
originalMap = MapIndexed[{#2, #} &, original];
fMap = Interpolation[originalMap]

I should get similar plot using your method and using the Union method.

@Nasser You need ParametricPlot to use that form. Try this:

Column[Pane /@ {ListLinePlot[original], Plot[fUnion[x], {x, 55.3346, 55.3565}],
   ParametricPlot[fMap[x], {x, 1, 13}, AspectRatio -> 0.618]}]

@Mr.Wizard nice ! I like your method :)

@Nasser Thanks. I voted for your answer, by the way.

@Mr.Wizard I am collecting all these methods since they are useful. Will update my answer showing your method, and the Gather method and mine, side by side. It is useful thing to know since these are very common things we do all the time with data.

@Nasser Sounds good. You might mention that you can programmatically get the domain of fMap with fMap[[1, 1]].

@Mr.Wizard yes. that is good idea. THis way it is automated.

@Mr.Wizard I remembered now why I could not get it to work. I did try paramateric plot, but go this:
Grid[{{Plot[fUnion[x], {x, 55.3346, 55.3565}]},
  {ParametricPlot[fMap[x], {x, 1, 13}]}
  }]

Right, you need to specify the AspectRatio as ParametricPlot defaults to Automatic, which is the tall skinny thing here.

That is because needed to use AspectRatio -> 0.618. But need to automate this also

There's nothing to automate, actually; you either choose the default behavior of Plot, which is AspectRatio -> 1/GoldenRatio (closely approximated by 0.618) or you choose the default behavior of ParametricPlot which gives you a 1:1 scaling.

@Mr.Wizard . It works OK without AspectRatio with plotted on its OWN. But when combined with the other plot, the first plot uses its aspect ratio, hence that is why it came up like this.....

@Mr.Wizard I mean, when I combine the plots? If I do not specify AspectRatio for the patameterPlot it comes up like above?

Grid[{{Plot[fUnion[x], {x, 55.3346, 55.3565}]},
  {ParametricPlot[fMap[x], {x, 1, 13}, AspectRatio -> Automatic]}
  }]

@Nasser I'm sorry, I don't understand what you're saying.

For this particular data AspectRatio -> Automatic, which means a 1:1 scaling, will give a useless plot. Is there mystery to this?