gnuplot-info

[Gnuplot-info] plot data

[horatiu <cl...@ya...>]

Hi there. I just started to use Gnuplot. I read some tutorials and I
understand a little how it works. But in real world it's more complicated. I
want to plot some data gives by a machine. The data that I have has a format
like this (5 columns separated by comma)

, .5,-1.3016, 0, 0
, 1,-1.3006, 0, 0
, 1.5,-1.2996, 0, 0
, 2,-1.2986, 0, 0
, 2.5,-1.2976, 0, 0
, 3,-1.2966, 0, 0
, 3.5,-1.2956, 0, 0
, 4,-1.2946, 0, 0
, 4.5,-1.2936, 0, 0

the first column is empty and the second contains data like .5 it means 0.5. 

set datafile separator ","
plot "CV.dat" index 2:3

but it gives me error

How can I plot 
X=column 3 vs Y=column 4 ?

Thanx a lot
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Re: [Gnuplot-info] plot data

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

horatiu wrote:
> set datafile separator ","
> plot "CV.dat" index 2:3

You almost certainly don't want to use the "index" option here.  Read 
the docs again, especially "help plot datafile" and "help using", which 
the former points to.

> but it gives me error

And what error might that be?

Re: [Gnuplot-info] plot data

[horatiu <cl...@ya...>]

I  succeeded my firs =E2=80=9Cserious=E2=80=9D graph with gnuplot, but I'm =
far from what I
really want. I still don't understand how to use =E2=80=9Cset data separato=
r=E2=80=9D
command. Like I said my data comes like this:

, 191,-.92, .133333333333333,-6900
, 191.5,-.919066666666667, .133333333333333,-6893
, 192,-.918, .133333333333333,-6885
, 192.5,-.917066666666667, .133333333333333,-6878
, 193,-.916133333333333, 6.66666666666667E-02,-13742
, 193.5,-.915066666666667, .133333333333333,-6863
, 194,-.914066666666667, .2,-4570.33333333333

I tried:

set datafile separator ","
plot "CV2.dat" using 2:3

the graph isn't good =E2=80=93 the shape is far from reality

I succeeded by replacing =E2=80=9C,=E2=80=9D with 2 blanks, but I prefer to=
 don't modify the
datafile.
Thanks
--=20
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l#a5679958
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Re: [Gnuplot-info] plot data

[Tammo H. <Tam...@ie...>]

> I  succeeded my firs "serious" graph with gnuplot, but I'm far from what=
 I
> really want. I still don't understand how to use "set data separator"
> command. Like I said my data comes like this:
> 
> , 191,-.92, .133333333333333,-6900
> , 191.5,-.919066666666667, .133333333333333,-6893
> , 192,-.918, .133333333333333,-6885
> , 192.5,-.917066666666667, .133333333333333,-6878
> , 193,-.916133333333333, 6.66666666666667E-02,-13742
> , 193.5,-.915066666666667, .133333333333333,-6863
> , 194,-.914066666666667, .2,-4570.33333333333
> 
> I tried:
> 
> set datafile separator ","
> plot "CV2.dat" using 2:3
> 
> the graph isn't good - the shape is far from reality

You will need to be more specific in what is wrong with it? Does gnuplot p=
lot the data 
correctly? Maybe you should post the core of your plotfile.

> I succeeded by replacing "," with 2 blanks, but I prefer to don't modify=
 the
> datafile.
> Thanks


-- 
Tammo Heeren, Ph.D
mailto: Tam...@ie...

Re: [Gnuplot-info] plot data

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

horatiu wrote:
> I  succeeded my firs =E2=80=9Cserious=E2=80=9D graph with gnuplot, =
but I'm far from what I
> really want. I still don't understand how to use =E2=80=9Cset data =
separator=E2=80=9D
> command. Like I said my data comes like this:
>=20
> , 191,-.92, .133333333333333,-6900

The fact that there's a non-existing firs column may disrupt things=
=20
here.   gnuplot wouldn't consider a leading blank an indicator that=
=20
there's an empty first column.  I think it was meant to do so for=
=20
non-blank separators, but in case of doubt, that's one of the things =
I'd=20
be wary of.

> the graph isn't good =E2=80=93 the shape is far from reality

Please do be more specific.  What *is* the shape, and what is "realit=
y",=20
and what's different between those?

Re: [Gnuplot-info] plot data

[Stein <hr....@ho...>]

 plot '<sed "s/,/0  /g" yourdatafile' using 2:3 w l 


horatiu wrote:
> 
> (5 columns separated by comma)
> 
> , .5,-1.3016, 0, 0
> , 1,-1.3006, 0, 0
> , 1.5,-1.2996, 0, 0
> , 2,-1.2986, 0, 0
> , 2.5,-1.2976, 0, 0
> , 3,-1.2966, 0, 0
> , 3.5,-1.2956, 0, 0
> , 4,-1.2946, 0, 0
> , 4.5,-1.2936, 0, 0
> 
> Thanx a lot
> 

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