Cfrgtkky

I tried to use context's startmatrix/stopmatrix nested with predefined matrix blocks. In latex it works like this:

documentclass{article}

usepackage{amsmath}



defmatOne{begin{matrix}1 & 0 \ 0 & 1end{matrix}}

defmatTwo{begin{matrix}a\bend{matrix}}

defmatThree{begin{matrix}c & dend{matrix}}



begin{document}

    begin{align*}

        begin{pmatrix}

            matOne & matTwo\

            matThree & e\

        end{pmatrix}\

        begin{pmatrix}

            1 & 0 & a\

            0 & 1 & b\

            c & d & e\

        end{pmatrix}

    end{align*}

end{document}

The top matrix out of blocks looks the same as the bottom one. In context I tried the following:

definemathmatrix[pmatrix][left={left(}, right={right)}, distance=1em]



defmatOne{startmatrixNC 1 NC 0 NRNC 0 NC 1NRstopmatrix}

defmatTwo{startmatrixNC aNRNC bNRstopmatrix}

defmatThree{startmatrixNC c NC dNRstopmatrix}



starttext



startformula

    startpmatrix

        NC matOne NC matTwoNR

        NC matThree NC eNR

    stoppmatrix

stopformula

startformula

    startpmatrix

        NC 1 NC 0 NC a NR

        NC 0 NC 1 NC b NR

        NC c NC d NC eNR

    stoppmatrix

stopformula



stoptext

Here the top matrix looks different than the bottom one. It seems that the distance isn't applied after a block matrix. Is there a way to fix this?

I'm unsure whether this breaks something else but it seems as if the definition of NC is not reverted properly. Reported here: https://mailman.ntg.nl/pipermail/ntg-context/2017/089631.html

I cranked distance up to 2em to make the difference more visible.

unprotect



defmath_matrix_stop

  {crcr

 % ifgridsnapping else

     mathstrutcrcr

     noalign{vskip-baselineskip}%

 % fi

   egroup

   gdefmath_matrix_NC{endmathaligntab}

   egroup

   mathmatrixright

   endgroup}



protect



definemathmatrix[pmatrix][left={left(}, right={right)}, distance=2em]



defmatOne{startmatrixNC 1 NC 0 NRNC 0 NC 1NRstopmatrix}

defmatTwo{startmatrixNC aNRNC bNRstopmatrix}

defmatThree{startmatrixNC c NC dNRstopmatrix}



starttext



startformula

  startpmatrix

    NC matOne NC matTwo NC matTwo NR

    NC matThree NC e NC eNR

  stoppmatrix

stopformula

startformula

  startpmatrix

    NC 1 NC 0 NC a NR

    NC 0 NC 1 NC b NR

    NC c NC d NC eNR

  stoppmatrix

stopformula



stoptext

FWIW, nested matrices work currently with the current version of ConTeXt (2019.03.21). The bug was fixed with this commit. The code listed in the example gives the following: