I have written a vector

   \textbf{\underline w} &= \begin{bmatrix}
          \textbf{0} \\
          \textbf{v} \\

However I want to write the number of elements in the vector too. That is I want to write it like 0_{1\times 4} then v_{1\times 5} and so on.

Is it possible to write that in the vector w ?

How to do it?

Please help.

  • 1
    what is the problem? please clarify! – Zarko Sep 1 '18 at 16:13
  • Although this is a personnal opition, I would not use such notations. Why would w be underlined and not v ? – BambOo Sep 1 '18 at 16:17

You should use \mathbf, not \textbf.

\mathbf{0}_{1\times 4}\\
\mathbf{v}_{1\times 5}\\
\mathbf{0}_{1\times 4}

Probably the figures should be switched, though.

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