gnuplot-info

[Gnuplot-info] Are you able to help me wit this task in Gnuplot

[Frank R. P. <fr...@st...>]

I'm working with a project at school and are struggling with a task in=20
Gnuplot. I don't know if it's possible.

I have an ASCII file with about 20 columns of numbers (one of those colum=
ns=20
are barometric pressure) and there is no problem making a graph of any of=
 the=20
columns. The task I'm struggling with is how to include one of those colu=
mns=20
in an equation, and get a graph. I will try to describe this by an exampl=
e.

One of the columns is some thousand samples of barometric pressure as a r=
ocket=20
goes up. I'm getting a nice curve from those samples. I also have an equa=
tion=20
which I may use to calculate the height from barometric pressure. How May=
 I=20
get Gnuplot to use this equation and the column from the ASCII file to gi=
ve me=20
an altitude graph?


Frank R. Pettersen

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Start.no tilbyr n=E5 raskere bredb=E5nd til lavere pris.
Sjekk http://www.start.no/bredband/ for mer informasjon

Re: [Gnuplot-info] Are you able to help me wit this task in Gnuplot

[<br...@ph...>]

Frank Richard Pettersen wrote:
> I have an ASCII file with about 20 columns of numbers (one of those columns 
> are barometric pressure) and there is no problem making a graph of any of the 
> columns. The task I'm struggling with is how to include one of those columns 
> in an equation, and get a graph.

You don't include the column in an equation, you apply a function to the 
data before plotting them.   Read "help using" attentively and you'll 
understand this example:

	plot 'data' using 1:(log($5/p0)*scale+h0)