 Usage:  gc = grcube(x{,m{,form}})  
 
 Input:

  x                      n x 3 matrix 
                         
  m                      3 x 1 vector or scalar, numbers of labels for 
                         each of the axes 
                         
  form                   3 x 1 string vector or 1 string, the formatstring(s) 
                         for the axes x, y and z 
                         
 Output:

  gc                     composed graphical object: 
                         gc.box : box around the data 
                         gc.x : label for the x-axes 
                         gc.y : label for the y-axes 
                         gc.z : label for the z-axes 
                         gc.c : label for the corners 
                         
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(C) MD*TECH Method and Data Technologies, 17.8.2000
