How can I write block matrix like this?

Question

Can someone please help me out in writing this matrix?

Werner · Accepted Answer

documentclass{article}

usepackage{amsmath}

begin{document}

Thus the matrix representation~$mathcal{L}$ under the basis is
[
  begin{pmatrix}
    A &   &        & 0 
      & A &        &   
      &   & ddots &   
    0 &   &        & A
  end{pmatrix}
]
The desired result follows immediately.

end{document}

wipet · Answer

In Plain TeX, your document looks like this:
Thus the matrix representation~$cal L$ under the basis is
$$
  pmatrix{ A &   &        & 0 cr
              & A &        &   cr
              &   & ddots &   cr
            0 &   &        & A }
$$
The desired result follows immediately.
bye

How can I write block matrix like this?

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