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| author | Jim Pick <jim@jimpick.com> | 1998-03-08 23:05:22 -0800 |
|---|---|---|
| committer | Bryan Newbold <bnewbold@robocracy.org> | 2017-02-20 00:05:27 -0800 |
| commit | b21cac3362022718634f7086964208b2eed8e897 (patch) | |
| tree | 16f4b2e70645c0e8e2202023170b5a94baa967e3 /determ.scm | |
| parent | 3796d2595035e192ed4bf1c9a6bfdb13c3c9d261 (diff) | |
| parent | f24b9140d6f74804d5599ec225717d38ca443813 (diff) | |
| download | slib-b21cac3362022718634f7086964208b2eed8e897.tar.gz slib-b21cac3362022718634f7086964208b2eed8e897.zip | |
Import Debian changes 2c0-3debian/2c0-3
slib (2c0-3) unstable; urgency=low
* New maintainer.
* slibconfig script to automatically configure guile.
* Fix type in description, closes: Bug#18996
slib (2c0-2) unstable; urgency=low
* Minor fix for debian/rules targets
slib (2c0-1) unstable; urgency=low
* New upstream source
* New maintainer
Diffstat (limited to 'determ.scm')
| -rw-r--r-- | determ.scm | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/determ.scm b/determ.scm new file mode 100644 index 0000000..4b53e5f --- /dev/null +++ b/determ.scm @@ -0,0 +1,14 @@ +;"determ.scm" Determinant + +(define (determinant m) + (define (butnth n lst) + (if (zero? n) (cdr lst) (cons (car lst) (butnth (+ -1 n) (cdr lst))))) + (define (minor m i j) + (map (lambda (x) (butnth j x)) (butnth i m))) + (define (cofactor m i j) + (* (if (odd? (+ i j)) -1 1) (determinant (minor m i j)))) + (define n (length m)) + (if (eqv? 1 n) (caar m) + (do ((j (+ -1 n) (+ -1 j)) + (ans 0 (+ ans (* (list-ref (car m) j) (cofactor m 0 j))))) + ((negative? j) ans)))) |