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I am putting three matrices inside of a kbordermatrix, but the delimiters do not envolve the inner matrices completely. How can I do to stretch the kbordermatrix delimiters to envolve the inner matrices?

My MWE:

documentclass[brazil]{article}







usepackage{amsfonts,amssymb,array,mathtools}

usepackage{kbordermatrix}







begin{document}



begin{eqnarray} 

    mathbf{A} & = & 

    setlength{kbrowsep}{2pt}

    setlength{kbcolsep}{0pt}

    renewcommand{arraystretch}{1.5}

    renewcommand{kbldelim}{(}

    renewcommand{kbrdelim}{)}

    kbordermatrix{

        omit & & , & & , & cr

        omit & overbrace{begingroup

            setlength{arraycolsep}{2.5pt}

            begin{bmatrix}

            0,9960 & -0,0037    \

            0,0111 &  0,9867        

            end{bmatrix}

            endgroup} & , & overbrace{begingroup

            setlength{arraycolsep}{2.5pt}

            begin{bmatrix}

            0,9961 & -0,0059    \

            0,0715 &  1,0423

            end{bmatrix}

            endgroup} & , & overbrace{begingroup

            setlength{arraycolsep}{2.5pt}

            begin{bmatrix}

            1,0034 & 0,0009     \

            0,0098 & 0,9696

            end{bmatrix}

            endgroup}

    } nonumber

end{eqnarray}





end{document}

The execution results of aforementioned code:

P.S.: I would like to stretch the delimiters until the red arrows.

Turn off arraystretch. Then, manually, add the desired space between rows.

documentclass[brazil]{article}



usepackage{amsfonts,amssymb,array,mathtools}

usepackage{kbordermatrix}



begin{document}

begin{eqnarray} 

    mathbf{A} & = & 

    setlength{kbrowsep}{2pt}

    setlength{kbcolsep}{0pt}

%    renewcommand{arraystretch}{1.5}

    renewcommand{kbldelim}{(}

    renewcommand{kbrdelim}{)}

    kbordermatrix{

        omit & & , & & , & cr

        omit & overbrace{begingroup

            setlength{arraycolsep}{2.5pt}

            begin{bmatrix}

            0,9960 & -0,0037    \[2ex]

            0,0111 &  0,9867        

            end{bmatrix}

            endgroup} & , & overbrace{begingroup

            setlength{arraycolsep}{2.5pt}

            begin{bmatrix}

            0,9961 & -0,0059    \[2ex]

            0,0715 &  1,0423

            end{bmatrix}

            endgroup} & , & overbrace{begingroup

            setlength{arraycolsep}{2.5pt}

            begin{bmatrix}

            1,0034 & 0,0009     \[2ex]

            0,0098 & 0,9696

            end{bmatrix}

            endgroup}

    } nonumber

end{eqnarray}



end{document}

You don't really need kbordermatrix to obtain this layout. However, the matrix in the last column can't have a overbrace, so I added a vphantom of a similar matrix.

I also propose a variant with inner medium-sizd matrices, with the mmatrix environment ftom nccmath. Last, I had to load icomma to have a correct spacing of the decimal comma.

documentclass[brazil]{article}

usepackage{amssymb, array, mathtools}

usepackage{icomma, nccmath} 

newenvironment{bmmatrix}{medsizebmatrix}{endbmatrixendmedsize}



begin{document}



begin{align*}

mathbf{A} & = renewcommand{arraystretch}{1.5}

 begin{pmatrix}

            ,smash[t]{overbrace{begin{bmatrix}

            0{,}9960 & -0,0037 \

            0,0111 & 0,9867

            end{bmatrix}}}

 &negthickspace{,}negthickspace! & 

            smash[t]{overbrace{begin{bmatrix}

            0,9961 & -0,0059 \

            0,0715 & 1,0423

            end{bmatrix}}}

 &negthickspace{,}negthickspace! & 

            {smash[t]{overbrace%

            {begin{bmatrix}

            1,0034 & 0,0009 \

            0,0098 & 0,9696

            end{bmatrix}}}}, vphantom{begin{bmatrix}, \ ,

  end{bmatrix}}

 end{pmatrix}\[2ex] 

mathbf{A} & = renewcommand{arraystretch}{1.5}

begin{pmatrix}

            ,smash[t]{overbrace{begin{bmmatrix}

            0{,}9960 & -0,0037 \

            0,0111 & 0,9867

            end{bmmatrix}}}

 &negthickspace{,}negthickspace! &

            smash[t]{overbrace{begin{bmmatrix}

            0,9961 & -0,0059 \

            0,0715 & 1,0423

            end{bmmatrix}}}

 &negthickspace{,}negthickspace! &

            {smash[t]{overbrace%

            {begin{bmmatrix}

            1,0034 & 0,0009 \

            0,0098 & 0,9696

            end{bmmatrix}}}}, vphantom{begin{bmmatrix}, \ ,

  end{bmmatrix}}

 end{pmatrix}

 end{align*}



end{document}