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| author | Elizabeth Hunt <elizabeth.hunt@simponic.xyz> | 2023-09-27 09:53:37 -0600 |
|---|---|---|
| committer | Elizabeth Hunt <elizabeth.hunt@simponic.xyz> | 2023-09-27 09:53:37 -0600 |
| commit | 1a8c81d07efe55c5a6909aff32359d4b8866af1c (patch) | |
| tree | dbaf949a4d20226560d97ef9b48dbdcd71b7ad1a /src/approx/derivative.lisp | |
| parent | 5e85a662d21081bc27adc1142759659cca59cd62 (diff) | |
| download | cmath-1a8c81d07efe55c5a6909aff32359d4b8866af1c.tar.gz cmath-1a8c81d07efe55c5a6909aff32359d4b8866af1c.zip | |
keep unit tests but make directory structure more consistent with requirements i did not read
Diffstat (limited to 'src/approx/derivative.lisp')
| -rw-r--r-- | src/approx/derivative.lisp | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/src/approx/derivative.lisp b/src/approx/derivative.lisp new file mode 100644 index 0000000..02fcb4c --- /dev/null +++ b/src/approx/derivative.lisp @@ -0,0 +1,9 @@ +(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)))) |