using variable for subscript in math+lua

* using variable for subscript in math+lua
@ 2012-10-25  0:38 Jeong Dal
  2012-10-25  1:02 ` Philipp Gesang
  0 siblings, 1 reply; 10+ messages in thread
From: Jeong Dal @ 2012-10-25  0:38 UTC (permalink / raw)
  To: ntg-context

Dear Hans, Lucas, Wolfgang, Aditya

Now, I write a matrix using \startluacode by the helps of  you.
Also, I can do some operations in matrices which reduced my typing job.
In this code, I have to give all the entries of a matrix as a table. It is good to use in many cases.

I have one more question. If the given array is as the following and it works well.
%%%%%%%%
\starttext
\startluacode
  printMatrix = function (t)
	context.startmatrix{left = "\\left(\\,", right = "\\,\\right)"}
	for _, r in ipairs(t) do
		for _, c in ipairs(r) do
			context.NC(c)
		end
		context.NR()
	end
	context.stopmatrix()
end
\stopluacode

\startformula
\startluacode
local mat={{"a_{11}","a_{12}","a_{13}"},{"a_{21}","a_{22}","a_{23}"},{"a_{31}","a_{32}","a_{33}"}}
printMatrix(mat)
\stopluacode
\stopformula
\stoptext

%%%%%%%%%%%%%

However, there might be a better way to do job using "for" iteration.
I tired to use "i, j" in several ways but it doesn't work.  

  function printMatrixA()
	context.startmatrix{left = "\\left(\\,", right = "\\,\\right)"}
	for i=1,3 do
		for j=1, 3 do
			context.NC("a_{ij}")
		end
	context.NR()
	end
	context.stopmatrix()
  end

%%%%%%%%%%%%%%%

Is there a way to do such a job using "for" iteration?

Thank you for reading.

Best regards,

Dalyoung
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