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Re: Creating graph with only a few data points

  • To: mathgroup at
  • Subject: [mg28901] Re: Creating graph with only a few data points
  • From: Oliver Tonn <nospam at>
  • Date: Fri, 18 May 2001 01:13:04 -0400 (EDT)
  • References: <9dtb52$>
  • Sender: owner-wri-mathgroup at

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:
>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
>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
>-----Ursprungliche Nachricht-----
>Von: Oliver Tonn [mailto:nospam at]
>Gesendet: Dienstag, 15. Mai 2001 06:59
>An: mathgroup at
>Betreff:  data points
>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
>and a transistor. I'm looking for a software, with which I only have to
>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
>with Mathematica.
>Greetings Oliver

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