[luatex] writing and reading a file

[Joseph Wright]

On 02/02/2014 19:16, Herbert Voss wrote:
> Hello all,
>
> I have a problem with the following example. It creates the
> external data file "tmp.data" with the \directlua call. This
> file is then read by \addplot. You can choose any kind of
> values, e.g. 4000, 500, or whatever instead of the 5000 steps,
> \addplot is missing some of the rightmost data.
>
> For a second run, comment the \directlua call (the data file
> is already created by the preceding run). The output is now
> correct.
>
> I suppose that the data file is closed too late.
> But I am not sure.
>
> Herbert

You can certainly see that the file is not 'right' at the appropriate 
place: adding a marker (undefined) control sequence just after the 
\directlua line (or indeed after the plot), the final line of the data 
file is

     1.9607999999998 1.1218274062469
-- 
Joseph Wright