Re: [Gnuplot-info] How to plot multiple fit functions in a single box

[rekha s. <rek...@gm...>]

Dear Sir
My gnuplot version is
 Version 5.2 patchlevel 2    last modified 2017-11-01

With the  test.gnu file as suggested by you
f(x,a0,a1) = a0 + a1/x

fit f(x,a01,a11) 'test.data' using 1:2 via a01,a11
fit f(x,a02,a12) 'test.data' using 1:3 via a02,a12
fit f(x,a02,a13) 'test.data' using 1:4 via a02,a13
fit f(x,a02,a14) 'test.data' using 1:5 via a02,a14
fit f(x,a02,a15) 'test.data' using 1:6 via a02,a15
fit f(x,a02,a16) 'test.data' using 1:7 via a02,a16
fit f(x,a02,a17) 'test.data' using 1:8 via a02,a17
fit f(x,a02,a18) 'test.data' using 1:9 via a02,a18
plot \
   'test.data' using 1:2 w points pt 1 t  , \
    f(x,a01,a11) t sprintf("K_{fit} = % g +  a_1/T", a01), \
   '' using 1:3 w points pt 1 t  , \
    f(x,a02,a12) t sprintf("K_{fit} = % g +  a_1/T", a02), \
   '' using 1:4 w points pt 1 t  , \
    f(x,a03,a13) t sprintf("K_{fit} = % g +  a_1/T", a03), \
  '' using 1:5 w points pt 1 t  , \
    f(x,a04,a14) t sprintf("K_{fit} = % g +  a_1/T", a04), \
  '' using 1:6 w points pt 1 t  , \
    f(x,a05,a15) t sprintf("K_{fit} = % g +  a_1/T", a05), \
  '' using 1:7 w points pt 1 t  , \
    f(x,a06,a16) t sprintf("K_{fit} = % g +  a_1/T", a06), \
  '' using 1:8 w points pt 1 t  , \
    f(x,a07,a17) t sprintf("K_{fit} = % g +  a_1/T", a07), \
  '' using 1:9 w points pt 1 t  , \
  '' using 1:4 w points pt 1 t  , \
    f(x,a03,a18) t sprintf("K_{fit} = % g +  a_1/T", a08), \

I am getting error below error
                                               ^
"hans.gnu", line 27: invalid expression

this  ^ points to a08) .

Regards
Rekha


On Sun, Jul 5, 2020 at 12:58 AM Hans-Bernhard Bröker <HBB...@t-...>
wrote:

> Am 04.07.2020 um 17:04 schrieb rekha sharma:
>
> > f(x) = (a0 + a1/x)
> > fit f(x) 'test.data' using 1:2 via a0,a1
> > plot 'test.data' using 1:2 w points pt 1 t  ,  f(x) t sprintf("K_{fit} =
> > a_0 +  a_1/T", a0)
> [... and the same for columns 3 to 9 as the y axis]
>
> > Using this code, I am getting a plot in eight boxes
>
> Using only that code, that cannot happen.  What you would get is 8
> plots, but not in 8 boxes, but rather on 8 separate pages of output (if
> your output supports that), or just a single plot window being updated 8
> times.  To get "a plot in 8 boxes", you would have to have "set
> multiplot layout ..." in effect somehow.
>
> > Is there any workaround for this issue in gnuplot so that I can plot all
> > above in a single box?
>
> For all the above to show up in a single "box", i.e. on a single page,
> you have to change the the way you define your fit model function and
> its parameters.  And then you have to undo the parts of your scripts
> that you claim aren't there, about "set multiplot"
>
> f(x,a0,a1) = a0 + a1/x
>
> fit f(x,a01,a11) 'test.data' using 1:2 via a01,a11
> fit f(x,a02,a11) 'test.data' using 1:3 via a02,a12
> [...]
>
> plot \
>    'test.data' using 1:2 w points pt 1 t  , \
>     f(x,a01,a11) t sprintf("K_{fit} = % g +  a_1/T", a01), \
>    '' using 1:3 w points pt 1 t  , \
>     f(x,a02,a12) t sprintf("K_{fit} = % g +  a_1/T", a02), \
>    '' using 1:4 w points pt 1 t  , \
>     f(x,a03,a13) t sprintf("K_{fit} = % g +  a_1/T", a03), \
> [...]
>
> If your gnuplot is new enough, the above can be improved upon using for
> loops for the fits and the parts of the plot, and arrays for the
> parameters.  And you'll want to re-think that sprintf, I think.
>
> That will give you a rather packed diagram, though.
>


-- 




Best wishes

Ms. Rekha
Teaching Assistant,
Department of Physics
RK college, Jaipur, India
Mob.: +11 90-95 790 71 697
Email: rek...@gm...