Dear Hans, Here is the file in my desktop. The reason I didn’t define “sgn” in the function “uppertri” is that it is inherited from the call of “determinant’. However, I put “sgn=1” so that the function “uppertri” works independently.
I checked the function “uppertri” and found that it worked fine. Here is a
sample file.
\environment MatrixLuacode
\starttext
\getbuffer[luaMatrix]
\startformula\startalign
\startluacode
local mat = {{0, 2, 4, -4, 1},{0, 0, 2, 3 , 4}, {2, 2, -6, 2, 4 }, {2,0 , -6,
9, 7},{2, 2, -6, 2, 4 },{2, 2, -6, 2, 4 }}
-- local mat = {{1,2,3},{3,4,5},{3,4,5},{3,4,5},{3,4,5}}
context.NC("\\text{Given Matrix}\\quad\\Rightarrow\\quad")
context.NC()
matrixOP.write(mat)
context.NR()
context.NC()
context("\\text{Upper Triangular}\\quad\\Rightarrow\\quad")
mat = matrixOP.upperTri(mat)
context.NC()
matrixOP.write(mat)
context.NR()
\stopluacode
\stopalign\stopformula
\stoptext
Sometimes, I got “-0” as an entry of matrix after calculation but I couldn’t
resolve it(I asked about it to this list before).
Thank you.
Best regards,
Dalyoung
MatrixLuacode.tex
Description: Binary data
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