[NTG-context] m-graph read data and plot
John Kitzmiller
kitz at inradius.net
Fri Aug 7 19:00:47 CEST 2015
Thank you Alan. setrange is the key I had not tried and I will be more careful with (2).
This may not be the proper way to ask, but it is related to the topic: how to get Hobby’s Figure 9 from the mpgraph manual to work using m-graph?
http://ctan.org/tex-archive/systems/doc/metapost/source-manual <http://ctan.org/tex-archive/systems/doc/metapost/source-manual>
Thanks again,
John
On Aug 7, 2015, at 6:23 AM, Alan BRASLAU <alan.braslau at cea.fr> wrote:
>
> You have two problems:
>
> 1) gdraw (4,1)--(7,1);
> has a unique ordinate, so graph will fail in this case if you do not
> explicitly set the range.
>
> 2) You have to take care with your choice of loop variables in MP not
> to run into conflicts those eventually used in macros. Also, as Hans
> indicated, you do need to declare that a is an array, as in
> numeric a[];
>
> Here is a MWE
>
> \enabletrackers[metapost.showlog]
> \usemodule[graph]
> \startMPpage[instance=graph,offset=3mm]
> draw begingraph(5cm,5cm);
> numeric a[];
> gdata("data.d", v,
> for j=1 upto 3:
> a[j]:=scantokens v[j];
> endfor ;
> );
>
> setrange (whatever,0,whatever,2);
> gdraw (a2,a1)--(a3,a1);
> endgraph;
> \stopMPpage
>
>
> Alan
>
>
> On Thu, 6 Aug 2015 16:48:51 -0400
> John Kitzmiller <kitz at inradius.net <mailto:kitz at inradius.net>> wrote:
>
>> On Aug 6, 2015, at 12:59 PM, Hans Hagen <pragma at wxs.nl <mailto:pragma at wxs.nl>
>> <mailto:pragma at wxs.nl <mailto:pragma at wxs.nl>>> wrote:
>>>
>>> On 8/6/2015 5:30 PM, John Kitzmiller wrote:
>>>> Given a file, data.d, containing 1 4 7
>>>>
>>>> I expected the following code to draw a line from (4,1) to (7,1)…
>>>>
>>>>
>>>> \enabletrackers[metapost.showlog]
>>>> \usemodule[m-graph]
>>>> \startMPpage[instance=graph,offset=3mm]
>>>> draw begingraph(5cm,5cm);
>>>> gdata("data.d", v,
>>>> for n = 1 upto 3:
>>>> a[n] = scantokens v[n];
>>>> endfor;
>>>>
>>>> show a1; show a2; show a3; % numeric
>>>> show v1; show v2; show v3; % string
>>>> gdraw (a2,a1)—(a3,a1); % same problem in or out of data group
>>>> );
>>>> endgraph;
>>>> \stopMPpage
>>>>
>>>> …the show lines return what I expected, but then come the
>>>> complaints:
>>>>
>>>> ! Inconsistent equation (off by 0.90000000000000002)…
>>>>>> (0,0,1,0,0,yypart S)
>>>> ! Transform components aren't all known…
>>>>
>>>
>>>> a[n] = scantokens v[n];
>>>
>>> is a defined?
>>
>> Thank you Hans. Do you mean numeric a[n]? It was not explicitly
>> declared; I did not think it needed to be—the show commands write
>> what I expect to the log—anyway, declaring a did not help.
>>
>>>
>>> also, use
>>>
>>> a[n] := scantokens v[n] ;
>>
>> Done. Still the same error messages and no pdf.
>>
>>>
>>>
>>>
>>>> My goal is to draw multiple box plots
>>>> https://en.wikipedia.org/wiki/Box_plot <https://en.wikipedia.org/wiki/Box_plot>
>>>> <https://en.wikipedia.org/wiki/Box_plot <https://en.wikipedia.org/wiki/Box_plot>>, either vertical or
>>>> horizontal, from data sets, but I am stuck at this early stage.
>>
>
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