From: Hans Hagen via ntg-context <ntg-context@ntg.nl>
To: mailing list for ConTeXt users <ntg-context@ntg.nl>
Cc: Hans Hagen <j.hagen@xs4all.nl>
Subject: Re: Axis macro in MetaFun
Date: Sat, 11 Sep 2021 19:00:25 +0200 [thread overview]
Message-ID: <2b05aa4a-edc3-3af6-0383-1328ce327b9b@xs4all.nl> (raw)
In-Reply-To: <2945364.l7x7BXaAel@sreeramtplt>
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
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next prev parent reply other threads:[~2021-09-11 17:00 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-11 14:27 kauśika cittūr via ntg-context
2021-09-11 16:19 ` Hans Hagen via ntg-context
2021-09-11 17:00 ` Hans Hagen via ntg-context [this message]
2021-09-12 2:07 ` kauśika cittūr via ntg-context
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