#NEWLINE# def zeros( r , c = None , cls = None ) : #NEWLINE# #INDENT# 'Returns a matrix of zeros with ``r`` rows and ``c`` columns;\n    if ``c`` is omitted a square matrix will be returned.\n\n    See Also\n    ========\n\n    ones\n    eye\n    diag\n    ' #NEWLINE# if ( cls is None ) : #NEWLINE# #INDENT# from . dense import Matrix as cls #NEWLINE# #UNINDENT# return cls . zeros ( r , c )