On Thu, 30 Sep 2010, Hans Hagen wrote:

> On 30-9-2010 8:19, Procházka Lukáš Ing. - Pontex s. r. o. wrote:
>>  Hello,
>>
>>  is it possible that Lua gets value of a MetaPost variable?
>>
>>  Let's have MetaPost code:
>>
>>  z11=(0,0)
>>  z12=(1,1)
>>  z21=(0,1)
>>  z22=(1,0)
>>
>>  aa[z11,z12]=bb[21,z22]
>>
>>  So now aa = bb = 0.5.
>>
>>  And I'd need to access MetaPost values 'aa' and 'bb' from Lua (e.g. in
>>  Lua: "local a = mpost.aa, b = mpost.bb").
>>
>>  Is it possible somehow?
>
> no

I don't know how MPlib handles metapost terminal output, but if you can 
capture the terminal output in lua, then you can use

show aa, bb;

in metapost and parse the output in lua.

Aditya