For what I understand from the example provided by gnuplot doc they actually re-plot the box images over the violin ones. 
################gnuplot code#########################
set title 'Superimposed violin plot and box plot'

set style fill solid bo -1
set boxwidth 0.075
set errorbars lt black lw 1

replot $viol2 using (1):2 with boxplot fc "white" lw 2, \
       $viol1 using (3):2 with boxplot fc "white" lw 
###########################################################
Great idea with the package!
Mihai 

On Wed, Jun 21, 2017 at 3:37 PM, <gretl-users-request@lists.wfu.edu> wrote:
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Today's Topics:

   1. Re: boxplot of matrix (Schaff, Frederik)
   2. Violin plot with box plot (Schaff, Frederik)
   3. Re: Violin plot with box plot (Logan Kelly)


----------------------------------------------------------------------

Message: 1
Date: Wed, 21 Jun 2017 03:19:53 +0000
From: "Schaff, Frederik" <Frederik.Schaff@fernuni-hagen.de>
To: "r.lucchetti@univpm.it" <r.lucchetti@univpm.it>, Gretl list
        <gretl-users@lists.wfu.edu>
Subject: Re: [Gretl-users] boxplot of matrix
Message-ID:
        <94DD4923F1D1534189901CE4E97BB72E4F42179F@Ymir.buerokommunikation.fernuni-hagen.de>

Content-Type: text/plain; charset="us-ascii"

> > Dear gretl users,
> >
> > I have created a matrix with 4 columns and 1000 rows and now I'd like
> > to use the boxplot command on it, but it is (despite it should) not
> > working... what am I getting wrong? Here is a MWE:
> >
> > ----------
> > nulldata 1000
> > matrix A=zeros(1000,4)
> > loop for r=1..1000
> >    loop for c=1..4
> >        A[r,c]= randgen1(u,0,c)
> >    endloop
> > endloop
> >
> > boxplot --matrix=A --output=display
> > ------------
> > Error msg:
> > ? boxplot --matrix=A --output=display
> > Command has insufficient arguments
> >
>
> You have to tell boxplot which columns of the matrix you want plotted. In
> your case, I suspect that what you want is
>
> <hansl>
> boxplot 1 2 3 4 --matrix=A --output=display </hansl>
>
> Also: you may want to use the --quiet option for loops ;)
>

That's it, many thanks! The quick-help documentation needs an update than, I guess:

"Generally, the argument varlist is required, and refers to one or more series in the current dataset (given either by name or ID number). But if a named matrix is supplied via the --matrix option this argument becomes optional: by default a plot is drawn for each column of the specified matrix."

To me this implies that I do not need to specify the columns. This option is not even mentioned.

-Frederik



------------------------------

Message: 2
Date: Wed, 21 Jun 2017 12:23:43 +0000
From: "Schaff, Frederik" <Frederik.Schaff@fernuni-hagen.de>
To: "Gretl list (gretl-users@lists.wfu.edu)"
        <gretl-users@lists.wfu.edu>
Subject: [Gretl-users] Violin plot with box plot
Message-ID:
        <94DD4923F1D1534189901CE4E97BB72E4F421C35@Ymir.buerokommunikation.fernuni-hagen.de>

Content-Type: text/plain; charset="us-ascii"

Hello,

some time back, Jack helped me produce a violin plot and suggested to make a function of it. Now I am trying to do so. However, I would like to add a box-plot "within" the violin, because the extreme points (e.g.) are not correctly displayed in a violin plot. See here for an original gnuplot examples: http://gnuplot.sourceforge.net/demo_cvs/violinplot.html

The "template" script I have attached is working for generating a box-plot or a violin plot, but I have no idea how I can merge them.

Any idea? Is it possible to somehow "see" the internals of the boxplot function? For then I should be able to copy & paste things such that it works.

Many thanks
Frederik
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Message: 3
Date: Wed, 21 Jun 2017 12:37:08 +0000
From: Logan Kelly <logan.kelly@uwrf.edu>
To: "'Gretl list'" <gretl-users@lists.wfu.edu>
Subject: Re: [Gretl-users] Violin plot with box plot
Message-ID:
        <DM5PR03MB285753E110EFB7D13420933784DA0@DM5PR03MB2857.namprd03.prod.outlook.com>

Content-Type: text/plain; charset="us-ascii"

Apologies for a superfluous post, but those plots are beautiful.

Logan

From: gretl-users-bounces@lists.wfu.edu [mailto:gretl-users-bounces@lists.wfu.edu] On Behalf Of Schaff, Frederik
Sent: Wednesday, June 21, 2017 7:24 AM
To: Gretl list (gretl-users@lists.wfu.edu) <gretl-users@lists.wfu.edu>
Subject: [Gretl-users] Violin plot with box plot

Hello,

some time back, Jack helped me produce a violin plot and suggested to make a function of it. Now I am trying to do so. However, I would like to add a box-plot "within" the violin, because the extreme points (e.g.) are not correctly displayed in a violin plot. See here for an original gnuplot examples: http://gnuplot.sourceforge.net/demo_cvs/violinplot.html

The "template" script I have attached is working for generating a box-plot or a violin plot, but I have no idea how I can merge them.

Any idea? Is it possible to somehow "see" the internals of the boxplot function? For then I should be able to copy & paste things such that it works.

Many thanks
Frederik
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