## Convention for transpose of a matrix

For a vector $v$, $v^{T}$ means a row vector. Now for a matrix $A$, $A^{T}$ can mean one of two things when the matrix is viewed in terms of vectors. Either the matrix is a row of column vectors or a column of row vectors. Which of the two is the conventional way of looking at the transpose of a matrix.

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Both. [adds words for char limit] – Yemon Choi Jun 13 2011 at 8:25