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
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