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(in-package :maxima-interface)
;;; Some of the operators used by Maxima are listed in comm.lisp.
(defparameter *lisp-to-maxima*
'((= . (maxima::mequal))
(/= . (maxima::mnotequal))
(+ . (maxima::mplus))
(- . (maxima::mminus))
(* . (maxima::mtimes))
(sqrt . (maxima::%sqrt))
(expt . (maxima::mexpt))
(sin . (maxima::%sin))
(cos . (maxima::%cos))
(tan . (maxima::%tan))
(asin . (maxima::%asin))
(acos . (maxima::%acos))
(sinh . (maxima::%sinh))
(cosh . (maxima::%cosh))
(tanh . (maxima::%tanh))
(asinh . (maxima::%asinh))
(acosh . (maxima::%acosh))
(atanh . (maxima::%atanh))
(abs . (maxima::mabs))
(signum . (maxima::%signum))
(mod . (maxima::$mod))
(pi . maxima::$%pi)
(i . maxima::$%i)
(inf . maxima::$inf)
(plus . maxima::$plus)
(minus . maxima::$minus)
(diff . (maxima::$diff))
(limit . (maxima::$limit))
(integrate . (maxima::$integrate)))
"Association list for translating Lisp to Maxima")
(defparameter *maxima-to-lisp/operations*
'((maxima::mequal . =)
(maxima::mnotequal . /=)
(maxima::mplus . +)
(maxima::mminus . -)
(maxima::mtimes . *)
(maxima::mquotient . /)
(maxima::mrat . /)
(maxima::rat . /)
(maxima::%sqrt . sqrt)
(maxima::mexpt . expt)
(maxima::%log . log)
(maxima::%sin . sin)
(maxima::%cos . cos)
(maxima::%tan . tan)
(maxima::%asin . asin)
(maxima::%acos . acos)
(maxima::%atan . atan)
(maxima::$atan2 . atan)
(maxima::%sinh . sinh)
(maxima::%cosh . cosh)
(maxima::%tanh . tanh)
(maxima::%asinh . asinh)
(maxima::%acosh . acosh)
(maxima::%atanh . atanh)
(maxima::mabs . abs)
(maxima::%signum . signum)
(maxima::$mod . mod)
(maxima::$diff . diff)
(maxima::%derivative . diff)
(maxima::%integrate . integrate)
(maxima::%limit . limit))
"Association list for translating operations from Maxima to Lisp")
(defparameter *maxima-to-lisp/constants*
'((maxima::$%pi . pi)
(maxima::$%e . (exp 1))
(maxima::$%i . (complex 0 1))
(maxima::$inf . inf)
(maxima::$plus . plus)
(maxima::$minus . minus))
"Association list for translating constants from Maxima to Lisp")
(defun lisp-to-maxima (sexp)
"Translate s-expression to Maxima."
(cond
((atom sexp)
(or (rest (assoc sexp *lisp-to-maxima*)) sexp))
((consp sexp)
(destructuring-bind (x . xs) sexp
(let ((entry (assoc x *lisp-to-maxima*)))
(if entry
(cons (rest entry) (mapcar #'lisp-to-maxima xs))
(case x ; Deal with special cases.
(1+
`((maxima::mplus) ,(lisp-to-maxima (first xs)) 1))
(1-
`((maxima::mplus) ,(lisp-to-maxima (first xs)) ((maxima::mminus) 1)))
(exp
`((maxima::mexpt) maxima::$%e ,(lisp-to-maxima (first xs))))
(log
(if (= (length xs) 2)
`((maxima::mquotient)
((maxima::%log) ,(lisp-to-maxima (first xs)))
((maxima::%log) ,(lisp-to-maxima (second xs))))
`((maxima::%log) ,(lisp-to-maxima (first xs)))))
(atan
(if (= (length xs) 2)
`((maxima::$atan2) ,@(mapcar #'lisp-to-maxima xs))
`((maxima::%atan) ,(lisp-to-maxima (first xs)))))
(complex
(if (= (length xs) 1)
(lisp-to-maxima (first xs))
`((maxima::mplus) ,(lisp-to-maxima (first xs))
((maxima::mtimes) ,(lisp-to-maxima (second xs)) maxima::$%i))))
(/
(if (= (length xs) 1)
`((maxima::mquotient) 1 ,(lisp-to-maxima (first xs)))
`((maxima::mquotient) ,@(mapcar #'lisp-to-maxima xs))))
(otherwise
(cons (list (lisp-to-maxima x)) (mapcar #'lisp-to-maxima xs))))))))))
(defun maxima-to-lisp (sexp)
"Translate s-expression from Maxima."
(flet ((translate-op (x)
(rest (assoc x *maxima-to-lisp/operations*)))
(translate-const (x)
(rest (assoc x *maxima-to-lisp/constants*))))
(cond
((atom sexp)
(or (translate-const sexp) sexp))
((consp sexp)
(destructuring-bind (x . xs) sexp
(or (translate-op x)
(if (member 'maxima::simp xs :test #'eq)
(maxima-to-lisp x) ; Omit tags added by Maxima.
(cons (maxima-to-lisp x) (maxima-to-lisp xs)))))))))
(defun evaluate (sexp)
"Evaluate an expression in Maxima and return its translation to Lisp."
(maxima-to-lisp (maxima-eval (lisp-to-maxima sexp))))
(defun diff (sexp var &optional (n 1))
"Differentiate s-expression with respect to VAR, N times."
(evaluate `(maxima::$diff ,sexp ,var ,n)))
(defun integrate (sexp var &rest integration-limits)
"Integrate s-expression with regard to variable VAR, optionally using INTEGRATION-LIMITS."
(if integration-limits
(destructuring-bind (a b) integration-limits
(evaluate `(maxima::$integrate ,sexp ,var ,a ,b)))
(evaluate `(maxima::$integrate ,sexp ,var))))
(defun expand (sexp)
"Expand s-expression."
(evaluate `(maxima::$expand ,sexp)))
(defun simplify (sexp)
"Simplify s-expression."
(evaluate `(maxima::$ratsimp (maxima::$trigsimp ,sexp))))
(defun limit (sexp &optional var value dir)
"Compute the limit of an s-expression as the variable VAR approaches VALUE
from the direction specified by DIR, which is either one of the PLUS or MINUS
symbols."
(declare (type (or null (member plus minus))))
(evaluate `(maxima::$limit ,sexp ,@(mapcar #'lisp-to-maxima
(cond
(dir (list var value dir))
(value (list var value)))))))