Re: [NTG-context] using variable for subscript in math+lua

[Procházka Lukáš]

On Thu, 25 Oct 2012 20:02:22 +0200, Otared Kavian <ota...@gmail.com> wrote:

Hi Philipp,

Thanks to you, Dalyoung and Hans for the nice example using luacode.
I was wonedring how would you modify your code in order to be able to change 
the name of the matrix if necessary. For instance, how to modify your code in 
such a way that upon saying
         \ctxlua{document.print_matrix(b,3)}
one gets a 3x3 matrix whos coefficients are b_{11},…b_{33}.

Thanks in advance: OK

Something like this?

·································································

  document.print_matrix = function (x, y, name)
    local name = name or "a"
    if not y then y = x end -- default to square
    context.startmatrix{left = "\\left(\\,", right = "\\,\\right)"}
    local schema = name .. "_{%d%d}" -- %d: prints integer part
    for i=1, x do
      for j=1, y do
        --- use the template defined above to print the
        --- row and column
        context.NC(string.format(schema, i, j))
      end
      context.NR()
    end
    context.stopmatrix()
  end

·································································

Call with:

  \ctxlua{document.print_matrix(3, 3, "b")}

Best regards,

Lukas
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