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This prefix operator is used to represent \(n\times m\) matrices. mat
has \(n\) arguments interpreted as
rows of the matrix, each of which is a list of \(m\) expressions representing elements in that
row. For example, the matrix
mat((a,b,c),(d,e,f))
.
Note that the single column matrix
mat((x),(y))
. The inside parentheses
are required to distinguish it from the single row matrix mat((x,y))
.
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