RE: Re: Creating graph with only a few data points

• To: mathgroup at smc.vnet.net
• Subject: [mg28942] RE: [mg28901] Re: Creating graph with only a few data points
• From: "David Park" <djmp at earthlink.net>
• Date: Sat, 19 May 2001 22:28:00 -0400 (EDT)
• Sender: owner-wri-mathgroup at wolfram.com

```Oliver,

You probably could get some good help with your problem but you are not
giving people a chance to help you. First, without giving a valid email
address people can't communicate with you and if they can't communicate with

Next, your problem is very ill stated. There are two aspects to your
problem. What, exactly, is it that you want to plot? Then, how can you plot
it to make a nice piece of graphics? Are your data points supposed to fit
some kind of model? Then what is the model? You may need to use something
like the Statistics`NonlinearFit` package.

If you have a model, and a set of data points, then a routine could probably
be written that would fit and make a nice plot of the data. Mathematica has
to be told what you want to do. Mathematica could not possibly have built-in
routines for every type of mathematical or engineering calculation. You
almost always have to do a little specification and programming yourself.
But I am fairly certain that Mathematica can easily be used to solve your
problem - if you can state it clearly.

David Park

> From: Oliver Tonn [mailto:nospam at newsranger.com]
To: mathgroup at smc.vnet.net
> Sent: Friday, May 18, 2001 1:13 AM
> To: mathgroup at smc.vnet.net
> Subject: [mg28942] [mg28901] Re: Creating graph with only a few data points
>
>
> First of all, thanks for trying to help me.
> I'm sorry, but your solution seems not to be applicable for my problem.
> I'm afraid, but I don't know which parameters I've to use for
> Table and Plot.
> I know the plot command, but not in this context.
> The other problem is, that not only the y-values is up and down, also the
> x-value do so.
> For example:
>
> If you have the graph for a Thyristordiode, the x-axis would be
> the voltage over
> the diode and the y-axis is the current. Until a specific voltage
> is reached
> there is nearly no current floating. After that point a current
> is floating and
> the voltage is going down.
>
> Everytime I try to enter data, e.g.
> ({0,0},{1,0.5},{2,0.5},{3,0.5],{1,15}), I
> get an error.
>
> Has anybody another idea?
>
> Greetings Oliver
>
>
> >Hello Oliver,
> >
> >draw your curve on squared paper and identify the coordinates
> {x, y} of your
> >"significant points".
> >Then proceed as shown below:
> >
> >IN:
> >lst = {{1, 1}, {2, 1.5}, {2.5, 2}, {3, 3}, {4, 5}, {5, 6.5}};
> >itp = Interpolation[lst, InterpolationOrder -> 3];
> >Table[itp[x], {x, 1, 5, 0.5}]
> >Plot[itp[x], {x, 1, 5}]
> >
> >Best regards,
> >
> >Matthias Bode
> >Sal. Oppenheim jr. & Cie. KGaA
> >Koenigsberger Strasse 29
> >D-60487 Frankfurt am Main
> >GERMANY
> >Tel.: +49(0)69 71 34 53 80
> >Mobile: +49(0)172 6 74 95 77
> >Fax: +49(0)69 71 34 6380
> >E-mail: matthias.bode at oppenheim.de
> >Internet: http://www.oppenheim.de
> >
> >
> >
> >-----Ursprungliche Nachricht-----
> >Von: Oliver Tonn [mailto:nospam at newsranger.com]
> >Gesendet: Dienstag, 15. Mai 2001 06:59
> >An: mathgroup at smc.vnet.net
> >Betreff:  data points
> >
> >
> >Hello,
> >
> >I'm a student at a school for technicians (electronic). I'm making my
> >calculations with Mathematica.
> >For a documentation I want to create a graph with the characteristic of a
> >diode
> >and a transistor. I'm looking for a software, with which I only have to
> >enter
> >some significant points of the graph, the scale, and the legend. Then the
> >software should create the graph.
> >Does anybody know a software which could do that, or is it possible to do
> >this
> >with Mathematica.
> >
> >Greetings Oliver
> >
> >
>
>

```

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