[NTG-context] m-graph read data and plot

John Kitzmiller kitz at inradius.net
Thu Aug 6 22:48:51 CEST 2015


On Aug 6, 2015, at 12:59 PM, Hans Hagen <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>, either vertical or horizontal,
>> from data sets, but I am stuck at this early stage.

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