I was going to sketch a number of rectangles around the elements of a matrix, something like the picture but I didn't know how to do this. I would be grateful if someone could help me. Here is my matrix code without rectangles:

\mathbf {c_0}& & & \\
&\mathbf {c_1 }& & \\
& &\ \ddots & \\
&& &\mathbf {c_{r-1}} \\

enter image description here

  • Please make your code compilable. You can format it by selecting it and hitting ctrl+k or the {} button in the editor. (This will indent it by 4 spaces, which does the trick.) – cfr May 21 '17 at 18:27

You could use a tikz matrix:

\usetikzlibrary{matrix, positioning, fit}

        matrix of math nodes,
        nodes in empty cells,
        left delimiter={[},right delimiter={]}, 
        inner xsep=2pt, column sep=8pt, 
        ] (m)
        \mathbf {c_0}& & & \\
        &\mathbf {c_1 }& & \\[-8pt]
        & & \ddots & \\
        && &\mathbf {c_{r-1}} \\[4pt]
        && &\\
    \node[font=\scriptsize, above right= -5pt and 4pt of m.south east] {$(n+1)(r+1)\times4r$};
    \node[rectangle, draw, fit={(m-1-1) (m-2-1)}, inner sep=0pt, text width=22pt] {}; 
    \node[rectangle, draw, fit={(m-2-2) (m-3-2)}, inner sep=0pt, text width=22pt] {}; 
    \node[rectangle, draw, fit={(m-4-4) (m-5-4)}, inner sep=0pt, text width=22pt] {}; 

enter image description here

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