x\032E\ Length L x\032E\ length : ( 0 > 0 try L 0 if 1 1 line : $1Length0$ $111matLength1$ $xLength0$ $xyzt22matLength4$ $$

x\032E\ Size R x\032E\ rows : ( C x\032E\ cols : ( + 0 > 0 try R C 1 2 mat 0 0 1 2 mat if 1 1 line : $1Size0012mat$ $111matSize1112mat$ $xSize0012mat$ $xyzt22matSize2212mat$