Axis macro in MetaFun

Axis macro in MetaFun

[kauśika cittūr via ntg-context]

Dear All,

I am truly grateful for the new additions to MetaFun. It has greatly helped me 
in producing neat drawings for my academic work. In this connection, I have a 
few queries.

Currently I am using PGFPlots (with ConTeXt) to draw simple plots from CSV 
data. I was wondering if there is any way to do the same in MetaFuns. That is, 
is it possible to do something like the following in order to obtain a line 
plot of the values in the 'data.csv' file? Also is it possible to have the 
'labels' be the identical for all points in a given list? 

\startMPcode
  draw lmt_axis [
      sx = 2mm, sy = 2mm,
      nx = 80, ny = 40,
      tx = 15, ty = 15, 
      
      list = {
            [
                  connect = true,
                  color = "darkblue",
                  close = true,
                  points = {data.csv},
                  labels = {"•"},
            ]
      },
  ] withpen pencircle scaled 0.5mm;
\stopMPcode

My final query: is it possible to specify a co-ordinate transform for any/all 
of the axes? For instance in my work, I would like to plot the y-axis in the 
log-scale.

Thanks,
kauśika


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___________________________________________________________________________________

Re: Axis macro in MetaFun

[Hans Hagen via ntg-context]

On 9/11/2021 4:27 PM, kauśika cittūr via ntg-context wrote:

> My final query: is it possible to specify a co-ordinate transform for any/all
> of the axes? For instance in my work, I would like to plot the y-axis in the
> log-scale.
Alan is working on that when he is in distraction mode ... we have done 
some preparations already.

Hans

-----------------------------------------------------------------
                                           Hans Hagen | PRAGMA ADE
               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
        tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl
-----------------------------------------------------------------
___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage  : http://www.pragma-ade.nl / http://context.aanhet.net
archive  : https://bitbucket.org/phg/context-mirror/commits/
wiki     : http://contextgarden.net
___________________________________________________________________________________

Re: Axis macro in MetaFun

[Hans Hagen via ntg-context]

On 9/11/2021 4:27 PM, kauśika cittūr via ntg-context wrote:
> Dear All,
> 
> I am truly grateful for the new additions to MetaFun. It has greatly helped me
> in producing neat drawings for my academic work. In this connection, I have a
> few queries.
> 
> Currently I am using PGFPlots (with ConTeXt) to draw simple plots from CSV
> data. I was wondering if there is any way to do the same in MetaFuns. That is,
> is it possible to do something like the following in order to obtain a line
> plot of the values in the 'data.csv' file? Also is it possible to have the
> 'labels' be the identical for all points in a given list?
> 
> \startMPcode
>    draw lmt_axis [
>        sx = 2mm, sy = 2mm,
>        nx = 80, ny = 40,
>        tx = 15, ty = 15,
>        
>        list = {
>              [
>                    connect = true,
>                    color = "darkblue",
>                    close = true,
>                    points = {data.csv},
>                    labels = {"•"},
>              ]
>        },
>    ] withpen pencircle scaled 0.5mm;
> \stopMPcode
> 

It depends on how one has data in the csv, You can patch mlib-scn.lmt 
(line 659)

     if type(v) == "table" then
         return injectpath(v,connector,close)
     elseif type(v) == "string" then
         local code = load("return " .. v)
         if code then
             return code()
         end
     else
         return injectpair(0,0)
     end

then a string represents a function:

\starttext

\startluacode
     io.savedata("temp.csv", "x,y\n10,10\n20,40\n30,30\n")

     local mycsvsplitter = utilities.parsers.rfc4180splitter()

     function MP.MyPoints(name)
         local data = io.loaddata(name)
         local list = mycsvsplitter(data)
         table.remove(list,1)
         for i=1,#list do
             list[i][1] = tonumber(list[i][1])
             list[i][2] = tonumber(list[i][2])
         end
         mp.inject.path(list)
     end

\stopluacode

\startMPcode
   draw lmt_axis [
       sx = 2mm, sy = 2mm,
       nx = 80, ny = 40,
       tx = 15, ty = 15,

       list = {
             [
                   connect = true,
                   color = "darkblue",
                   close = true,
                   points = "MP.MyPoints('temp.csv')",
                   labels = {"•"},
             ]
       },
   ] withpen pencircle scaled 0.5mm;
\stopMPcode

\stoptext

we can of course have some predefined and when we can agree on how these 
files loo, adding a "csv" is no big deal ... it's all about consistent 
interfacing


-----------------------------------------------------------------
                                           Hans Hagen | PRAGMA ADE
               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
        tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl
-----------------------------------------------------------------
___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage  : http://www.pragma-ade.nl / http://context.aanhet.net
archive  : https://bitbucket.org/phg/context-mirror/commits/
wiki     : http://contextgarden.net
___________________________________________________________________________________

Re: Axis macro in MetaFun

[kauśika cittūr via ntg-context]

On Saturday, September 11, 2021 10:30:25 PM IST Hans Hagen wrote:
> On 9/11/2021 4:27 PM, kauśika cittūr via ntg-context wrote:
> > Dear All,
> > 
> > I am truly grateful for the new additions to MetaFun. It has greatly
> > helped me in producing neat drawings for my academic work. In this
> > connection, I have a few queries.
> > 
> > Currently I am using PGFPlots (with ConTeXt) to draw simple plots from CSV
> > data. I was wondering if there is any way to do the same in MetaFuns. That
> > is, is it possible to do something like the following in order to obtain
> > a line plot of the values in the 'data.csv' file? Also is it possible to
> > have the 'labels' be the identical for all points in a given list?
> > 
> > \startMPcode
> > 
> >    draw lmt_axis [
> >    
> >        sx = 2mm, sy = 2mm,
> >        nx = 80, ny = 40,
> >        tx = 15, ty = 15,
> >        
> >        list = {
> >        
> >              [
> >              
> >                    connect = true,
> >                    color = "darkblue",
> >                    close = true,
> >                    points = {data.csv},
> >                    labels = {"•"},
> >              
> >              ]
> >        
> >        },
> >    
> >    ] withpen pencircle scaled 0.5mm;
> > 
> > \stopMPcode
> 
> It depends on how one has data in the csv, You can patch mlib-scn.lmt
> (line 659)
> 
>      if type(v) == "table" then
>          return injectpath(v,connector,close)
>      elseif type(v) == "string" then
>          local code = load("return " .. v)
>          if code then
>              return code()
>          end
>      else
>          return injectpair(0,0)
>      end
> 
> then a string represents a function:
> 
> \starttext
> 
> \startluacode
>      io.savedata("temp.csv", "x,y\n10,10\n20,40\n30,30\n")
> 
>      local mycsvsplitter = utilities.parsers.rfc4180splitter()
> 
>      function MP.MyPoints(name)
>          local data = io.loaddata(name)
>          local list = mycsvsplitter(data)
>          table.remove(list,1)
>          for i=1,#list do
>              list[i][1] = tonumber(list[i][1])
>              list[i][2] = tonumber(list[i][2])
>          end
>          mp.inject.path(list)
>      end
> 
> \stopluacode
> 
> \startMPcode
>    draw lmt_axis [
>        sx = 2mm, sy = 2mm,
>        nx = 80, ny = 40,
>        tx = 15, ty = 15,
> 
>        list = {
>              [
>                    connect = true,
>                    color = "darkblue",
>                    close = true,
>                    points = "MP.MyPoints('temp.csv')",
>                    labels = {"•"},
>              ]
>        },
>    ] withpen pencircle scaled 0.5mm;
> \stopMPcode
> 
> \stoptext
> 
> we can of course have some predefined and when we can agree on how these
> files loo, adding a "csv" is no big deal ... it's all about consistent
> interfacing
> 
> 
> -----------------------------------------------------------------
>                                            Hans Hagen | PRAGMA ADE
>                Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
>         tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl
> -----------------------------------------------------------------

Dear Hans,

Many thanks for your detailed guidance. I think for now this patch should 
suffice for my simple needs.

Best,
kauśika


___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage  : http://www.pragma-ade.nl / http://context.aanhet.net
archive  : https://bitbucket.org/phg/context-mirror/commits/
wiki     : http://contextgarden.net
___________________________________________________________________________________