Re: [Gnuplot-info] Can I include variables in plot titles?

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

Check out 
'set label ...'
that might help you.

Tammo


On 5 Mar 2006 at 16:12, Tax, Rick wrote:

> 
> Hello,
> 
> I have a data file with wire caps generated by two different RC extracto=
rs. I want to generate a 
> scatter plot and run a linear regression on the data. Here are the basic=
 gnuplot commands that I 
> am using:
> 
> gnuplot> f(x) =3D k*x
> gnuplot> fit f(x) "wire.caps" via k
> gnuplot> plot "wire.caps", f(x)
> 
> The above commands generate a plot with the data points from file "wire.=
caps" along with the 
> line f(x). By default, the least squares line has the label "f(x)" on th=
e plot. Given that the 
> computed slope k is an important parameter in interpreting the plot and =
it will need to be used in 
> other tools/analysis, I want to include the value of k on the plot. 
> 
> gnuplot> show variables
> 
>  Variables:
>  pi =3D 3.14159265358979
>  k =3D 1.40150928555715
> 
> The fit command defined the variable k with the value determined by the =
linear regression fit as 
> shown above with the "show variables" command. Instead of labeling the L=
S line with the 
> default label "f(x)", I would like to label it with "f(x) =3D 1.401*x". =
I=B4m looking for something similar 
> to an sprintf function where I can generate the string "f(x) =3D 1.401*x=
" and then use this as the title 
> of the LS line on the plot command. 
> 
> While I=B4m a relative novice at using gnuplot, I could not find any men=
tion or examples of doing 
> this sort of thing. I would think that labeling a plot with calculated d=
ata would be something that 
> gnuplot users would want to do. Can I get gnuplot to label my LS line wi=
th "f(x) =3D 1.401*x" 
> where the 1.401 is the value of k generated by the fit command in the gn=
uplot command file 
> generating the plot?
> 
> BTW, I=B4m using the following version of gnuplot:
> 
>  G N U P L O T
>  Unix version 3.7
>  patchlevel 1
> 
> While we don=B4t have the latest version installed, I did search the lat=
est on-line gnuplot 
> documentation and FAQ at http://www.gnuplot.info which no success.
> 
> Thanks,
> Rick
> 
> 
> 
> 
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-- 
Tammo Heeren, Ph.D
mailto: Tam...@ie...