run

Signature

• run:	% $\to$ Partial ExpressionTree

Example

• This examples shows how to call MAPLE to compute the integral of the ${5}^{{\rm th}}$ Legendre polynomial:

  import from Integer, Maple, ExpressionTree, Partial ExpressionTree;
  
  n := 5;
  -- create a session (maple is not launched but a unique link is created)
  mapl := maple();
  
  -- send the maple code to compute the integral of the n-th legendre poly
  -- note that all the maple commands are terminated with ":"
  -- so that they do not generate any output
  -- here again, nothing happens, the commands are only stored
  input(mapl) << "with(orthopoly): p := P(" << n << ", x): int(p, x):";
  
  -- now launch maple and recover the result of the last command ("int")
  tree := run mapl;
  
  failed? tree => error "Unable to parse Maple's output";
  retract tree;
  

  Running the above code produces the following expression tree:

  
    (+(- (* (/ 21 16) (^ x 6)) (* (/ 35 16) (^ x 4)))(* (/ 15 16) (^ x 2)))