5.1.86 nrows

Syntax:

nrows ( matrix_expression )
nrows ( intmat_expression )
nrows ( intvec_expression )
nrows ( module_expression )
nrows ( vector_expression )

Type:

int

Purpose:

returns the number of rows of a matrix, an intmat or an intvec, resp. the minimal rank of a free module in which the given module or vector lives (the index of the last non-zero component).

Note:

Use ncols to get the number of columns of a given matrix or intmat.

Example:

ring R; matrix M[2][3]; nrows(M); → 2 nrows(freemodule(4)); → 4 module m=[0,0,1]; nrows(m); → 3 nrows([0,x,0]); → 2

See gen; matrix; module; ncols; vector.