Home Online Manual
Top
Back: nres
Forward: numerator
FastBack: Functions and system variables
FastForward: Control structures
Up: Functions
Top: Singular Manual
Contents: Table of Contents
Index: Index
About: About this document

5.1.101 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.