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Plotting a star surface .DAT file

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  Plotting a star surface .DAT file karin.walkerx3@gmail.com - 2015-09-07 18:09 -0700
    Re: Plotting a star surface .DAT file Jörg Buchholz <bookwood4new@freenet.de> - 2015-09-08 07:29 +0200
    Re: Plotting a star surface .DAT file Hans-Bernhard Bröker <HBBroeker@t-online.de> - 2015-09-09 20:10 +0200
      Re: Plotting a star surface .DAT file karin.walkerx3@gmail.com - 2015-09-09 17:36 -0700
        Re: Plotting a star surface .DAT file Jörg Buchholz <bookwood4new@freenet.de> - 2015-09-10 07:51 +0200
        Re: Plotting a star surface .DAT file Karl-Friedrich Ratzsch <mail.kfr@gmx.net> - 2015-09-10 07:56 +0200
        Re: Plotting a star surface .DAT file Hans-Bernhard Bröker <HBBroeker@t-online.de> - 2015-09-10 22:47 +0200

#3071 — Plotting a star surface .DAT file

So I have this .dat file containing data that is supposed to give me a star surface when plotted. The thing is I cannot get to plot it in any way. I really need help. I have no idea how to plot this in a way I get something that looks like a start surface.
My dat file contains 10 columns and what what appears to be endless lines. 

Can anyone help me please?

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#3072

On 08.09.2015 03:09, karin.walkerx3@gmail.com wrote:
> So I have this .dat file containing data that is supposed to give me a star surface when plotted. The thing is I cannot get to plot it in any way. I really need help. I have no idea how to plot this in a way I get something that looks like a start surface.
> My dat file contains 10 columns and what what appears to be endless lines.
>
> Can anyone help me please?
>
To create a 3D (surface) you need "splot" (see help splot or have a look 
to http://gnuplot.sourceforge.net/demo_5.0/surface1.html).

You need three columns (x, y, z) for ploting.

example:

splot 'star.dat' u 1:2:3 w p

Jörg

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#3074

Am 08.09.2015 um 03:09 schrieb karin.walkerx3@gmail.com:

> So I have this .dat file containing data that is supposed to give me
> a star surface when plotted.

"Supposed to" according to whom?

> The thing is I cannot get to plot it in any way.

That I hugely doubt.  But let's see: What did you try, and what makes 
you classify the result at "no plot in any way"?

> I really need help.

The you need to start by helping people help you.

> My dat file contains
> 10 columns and what what appears to be endless lines.

Aha.  And how did you arrive at the belief that this file is supposedly 
some kind of "star surface" ... and what kind of "star", anyway?

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#3075

Well, I tried using the command splot and I do not get any surface. 

I know this .dat file is supposed to plot a star surface, because I obtained it with a software that calculates parameters of star's photospheres, which are given by this file. It is part of a research project.

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#3076

On 10.09.2015 02:36, karin.walkerx3@gmail.com wrote:
> Well, I tried using the command splot and I do not get any surface.

No errormessage, nothing then? Which terminal do you use. Can you show a 
few lines from the datafile?

What do you exactly means with "I do not get any surface"? Nothing in 
the outpoutterminal, no points or .....?


With these simple data in a datfile called 'star.dat':

1   2   1
1   3   2
1   4   2
1   6   1

2   1   2
2   2   3
2   5   3
2   6   1

3   2   2
3   3   3
3   4   3
3   6   1

4   2   2
4   3   3
4   4   3
4   6   1

and the following commands:

set surface
splot 'star.dat' u 1:2:3 w lp

You got a surface.

Is this what you want to have?

Jörg

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#3077

Am 10.09.2015 um 02:36 schrieb karin.walkerx3@gmail.com:
> Well, I tried using the command splot and I do not get any surface. 
> 
> I know this .dat file is supposed to plot a star surface, because I obtained it with a software that calculates parameters of star's photospheres, which are given by this file. It is part of a research project.

If you want help, and for free, you have to show that you've put
some own thought into the problem. Otherwise it looks to people as
if you want to shove off work to them. They don't like that, without
pay. ;-)

Also, be _specific_ and _precise_.

So:
What do you get now, with what command exactly? Have you tried
plotting something more simple, looked at gnuplot's demo set?
How does your data look like? "Ten columns" is not nearly a description.
How should we know what output you want/expect?
Show a link to a sample picture, if you cannot describe it.

 K

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#3078

Am 10.09.2015 um 02:36 schrieb karin.walkerx3@gmail.com:
> Well, I tried using the command splot and I do not get any surface.

So would it have killed you to at least mention what you did get _instead_?

> I know this .dat file is supposed to plot a star surface, because I
> obtained it with a software that calculates parameters of star's
> photospheres, which are given by this file.

Aha, so because it's "parameters of a photosphere", it has to be a 
star's surface, just like that?  And the only description of its output 
given in the documentation of that mysterious program is "a file full of 
numbers, do with as you like"?  Seriously?

 > It is part of a research project.

Oh my...

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