On Aug 6, 2015, at 12:59 PM, Hans Hagen <pra...@wxs.nl <mailto:pra...@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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