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| author | Elizabeth Hunt <elizabeth.hunt@simponic.xyz> | 2023-09-07 12:19:32 -0600 |
|---|---|---|
| committer | Elizabeth Hunt <elizabeth.hunt@simponic.xyz> | 2023-09-07 12:19:32 -0600 |
| commit | 9fcd733232b6f209519d2eadc83ed4cbd3376e0d (patch) | |
| tree | 0b4dfead39515c11c5aa4a998ffc3683546eef65 /cl/src/approx/derivative.lisp | |
| parent | dadf03afa37c785d5bb68396381eb3105178847f (diff) | |
| download | cmath-9fcd733232b6f209519d2eadc83ed4cbd3376e0d.tar.gz cmath-9fcd733232b6f209519d2eadc83ed4cbd3376e0d.zip | |
common lisp!
Diffstat (limited to 'cl/src/approx/derivative.lisp')
| -rw-r--r-- | cl/src/approx/derivative.lisp | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/cl/src/approx/derivative.lisp b/cl/src/approx/derivative.lisp new file mode 100644 index 0000000..280463f --- /dev/null +++ b/cl/src/approx/derivative.lisp @@ -0,0 +1,8 @@ +(in-package :lizfcm.approx) + +(defun 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)))) |