Dear Hans, Thank you for checking and enhancing. I also got an error at “uppertri” as you point out. The version that I have sent is one in my notebook which may be different from that in the desktop at school. When I made a class material, it worked fine. I have to check it and send it to you again. I appreciate you for making it more usable for ConTeXt users. I also found that there is a matrix module for lua programming. It is nice for the calculation of matrix, but I have a difficulty to typeset the result. That’s why I try to write a code even though I am not good in Lua programming. If it is easy to take over the result into TeX, using the lua module is much efficient and correct, I think. Anyway, I hope that it helps to typeset matrices. Best regards, Dalyoung

Hi,

Can you check the attached? The uppertri is wrong but it was already wrong (e.g. sign is used but never assigned). I inlined some code so ... I think there were some more errors (obscured by the fact that that piece of code is not reached).

We can turn this into m-matrix or so, maybe we need to add some more.

Hans

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