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2.42.33  Number of rows : rowdim rowDim nrows

rowdim (or rowDim or nrows) takes as argument a matrix A.
rowdim (ou rowDim or nrows) returns the number of rows of the matrix A.
Input :

rowdim([[1,2,3],[3,4,5]])

or

nrows([[1,2,3],[3,4,5]])

Output :

2

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