Mathematicians would often to like to think of a row of a m by n matrix with entries from a , say, field, as a vector in the n-dimensional vector space over the field.
Though I am not a mathematician yet, I am stuck with a situation where my proof becomes significantly simpler if I did not care about the entries of the row but just think of it as a vector.
For instance, I'd like my rows to look like how the columns look here. The code for one of the matrices there:
$P=
\begin{bmatrix}
\biggl |& \biggl|&\biggl|\\
x_1&x_2 &x_3\\
\biggl|&\biggl|&\biggl|
\end{bmatrix}$
I'd be grateful if some one helped me.
Best Answer
Here's a way, inspired by
\rightarrofill
:I use
\llongdash
and\rlongdash
to back up slightly and so to ensure the correct alignment of the dashes.If dots are needed for denoting omitted rows, one can use
\hdotsfor
:instead of the code above will produce
Alternatively, one can use only one column
and get