Dear Luigi and listers,

Last year, I need to write a text for a linear algebra class.
Since there are many \startmatrix ¡¦ \stopmatrix and matrix calculations, I wrote a lua code which did matrix calculations and writing with a lot of help from this list. 
Using the code, I can write class materials easily. It is good enough for my purpose.
I am not good in Lua coding, so there may be many things to be checked for efficiency and for stability.

However, I attached the code because there may be someone who need it. 
It is also good thing to return what I get from the list back.

I hope that you enhance the code for better performance since you are an expert in Lua.

I always thank to this list and to developers of ConTeXt.

Best regards,

Dalyoung