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### `ord`

`ord([varlist])`
  :: It sets the ordering of indeterminates (variables).

return
  list of indeterminates
varlist
  list of indeterminates

- When an argument is given, this function rearranges the ordering of variables (indeterminates) so that the indeterminates in the argument varlist precede and the other indeterminates follow in the system's variable ordering. Regardless of the existence of an argument, it always returns the final variable ordering.
- Note that no change will be made to the variable ordering of internal forms of objects which already exists in the system, no matter what reordering you specify. Therefore, the reordering should be limited to the time just after starting Asir, or to the time when one has decided himself to start a totally new computation which has no relation with the previous results. Note that unexpected results may be obtained from operations between objects which are created under different variable ordering.

    [0] ord();
    [x,y,z,u,v,w,p,q,r,s,t,a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,_x,_y,_z,_u,_v,
    _w,_p,_q,_r,_s,_t,_a,_b,_c,_d,_e,_f,_g,_h,_i,_j,_k,_l,_m,_n,_o,
    exp(_x),(_x)^(_y),log(_x),(_x)^(_y-1),cos(_x),sin(_x),tan(_x),
    (-_x^2+1)^(-1/2),cosh(_x),sinh(_x),tanh(_x),
    (_x^2+1)^(-1/2),(_x^2-1)^(-1/2)]
    [1] ord([dx,dy,dz,a,b,c]);
    [dx,dy,dz,a,b,c,x,y,z,u,v,w,p,q,r,s,t,d,e,f,g,h,i,j,k,l,m,n,o,_x,_y,
    _z,_u,_v,_w,_p,_q,_r,_s,_t,_a,_b,_c,_d,_e,_f,_g,_h,_i,_j,_k,_l,_m,_n,
    _o,exp(_x),(_x)^(_y),log(_x),(_x)^(_y-1),cos(_x),sin(_x),tan(_x),
    (-_x^2+1)^(-1/2),cosh(_x),sinh(_x),tanh(_x),
    (_x^2+1)^(-1/2),(_x^2-1)^(-1/2)]

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