CAS inside prgm ?!

[dg1969]

Hi,

I'd like something these way :

Code:


export inv_laplace(k)
begin
  local f;
  f:=CAS(ilaplace(subst(expr("F"+k),'X','x')));
  return subst(f,'x','X');
end;

But it doesn't work like these...

I try with a CAS program but without success...

Code:


#cas
Inverse_laplace(k):=
BEGIN
  local f;
  f:=ilaplace(EXPR("F"+k+"(x)"));
  return subst(f,'x','X');
END;
#end

Can you help me to learn good practise ? What can we realy do with CAS program for that kind of problem ?

Thank you for your help.