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| author | Elizabeth Hunt <elizabeth.hunt@simponic.xyz> | 2023-10-09 21:37:44 -0600 |
|---|---|---|
| committer | Elizabeth Hunt <elizabeth.hunt@simponic.xyz> | 2023-10-09 21:37:44 -0600 |
| commit | e46e5eee74af75aa1123b2370ff2f4587f4adc2a (patch) | |
| tree | ae793dd22176613282e41ce6d15f481c072a8a57 /src/approx,derivative.lisp | |
| parent | adda6869cb2a07984b48c39fcd70ee76449c353d (diff) | |
| download | cmath-e46e5eee74af75aa1123b2370ff2f4587f4adc2a.tar.gz cmath-e46e5eee74af75aa1123b2370ff2f4587f4adc2a.zip | |
flatten directory structure to appease dr koebbe
Diffstat (limited to 'src/approx,derivative.lisp')
| -rw-r--r-- | src/approx,derivative.lisp | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/src/approx,derivative.lisp b/src/approx,derivative.lisp new file mode 100644 index 0000000..631a5c0 --- /dev/null +++ b/src/approx,derivative.lisp @@ -0,0 +1,25 @@ +(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)))) |