
  a) How to use the basic functions ? 
    
  b) The coefficients, integers or fractions, are randomly
     selected by the computer.

  c) The size of the matrices, are randomly selected by the 
     computer, but you can select the size if you want.

    Try the examples in this order.

   i : integer
   f : fraction

         aplsbi.c         aplsbf.c : A + B                          
          amnsi.c          amnsf.c : A - B            
            abi.c            abf.c : AB              
         tracei.c         tracef.c :        trace 
         minori.c         minorf.c :        minor 
        mminori.c        mminorf.c :       mminor 
         cofaci.c         cofacf.c :     cofactor 
        mcofaci.c        mcofacf.c :    mcofactor 
       adjointi.c       adjointf.c :      adjoint 
           invi.c           invf.c :      inverse (use     adjoint()) 
        inv_gji.c        inv_gjf.c :      inverse (use gaussjordan())
        inv_xhi.c        inv_xhf.c :      inverse (use the work on identity matrix)
            gji.c            gjf.c :  gaussjordan 
