||'''Book'''|| Linear Algebra ||
 ||'''Author'''|| Gilbert Strang ||
 ||'''Edition'''||  ||

/* code_begins */

{{{
A = matrix([[ 2.7,-1.8],[ 0,0.9],[9.0,-4.5]])
print A
A == -(-A)
-A = -matrix([[ 2.7,-1.8],[ 0,0.9],[9.0,-4.5]])
}}}

/* code_ends */

 * '''Solution by''': 
   * <s.n.v.sainadh,student,vycet>
   * <Your Name>, <Profession>, <Organization>