From 43f06890e2689af2ef54c4480fe5790692a24f65 Mon Sep 17 00:00:00 2001 From: Elizabeth Hunt Date: Wed, 11 Oct 2023 10:04:04 -0600 Subject: deprecate common lisp solutions and write c; it's too much effort to keep up with the requirements for an archive. --- src/approx,derivative.lisp | 25 ------------------------- 1 file changed, 25 deletions(-) delete mode 100644 src/approx,derivative.lisp (limited to 'src/approx,derivative.lisp') diff --git a/src/approx,derivative.lisp b/src/approx,derivative.lisp deleted file mode 100644 index 631a5c0..0000000 --- a/src/approx,derivative.lisp +++ /dev/null @@ -1,25 +0,0 @@ -(in-package :lizfcm.approx) - -(defun central-derivative-at (f x &optional (delta 0.01)) - (let* ((x2 (+ x delta)) - (x1 (- x delta)) - (y2 (apply f (list x2))) - (y1 (apply f (list x1)))) - (/ (- y2 y1) - (- x2 x1)))) - -(defun forward-derivative-at (f x &optional (delta 0.01)) - (let* ((x2 (+ x delta)) - (x1 x) - (y2 (apply f (list x2))) - (y1 (apply f (list x1)))) - (/ (- y2 y1) - (- x2 x1)))) - -(defun backward-derivative-at (f x &optional (delta 0.01)) - (let* ((x2 x) - (x1 (- x delta)) - (y2 (apply f (list x2))) - (y1 (apply f (list x1)))) - (/ (- y2 y1) - (- x2 x1)))) -- cgit v1.3