CAS command question

[DrD]

Unfortunately, this approach fails to return the (lhs or rhs), unless the input is constrained to coefficients with approximate numbers:

Example: s:="(1/3)x+(1/6)y<=80"; // lhs(s) ==> Error: Invalid input
(Extra credit challenge: Convert the exact(coefficients) to approximate)

(01-05-2017 04:49 PM)Han Wrote:  If you want a non-CAS program that does lhs and rhs:

Code:

EXPORT lhs(s)
BEGIN
  CAS.left(EVAL("'" + s + "'"));
END;

EXPORT rhs(s)
BEGIN
  CAS.right(EVAL("'" + s + "'"));
END;

lhs("x+y<4") returns x+y as desired