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-rw-r--r--net/ricketyspace/sicp/one/thirtyeight.scm19
1 files changed, 19 insertions, 0 deletions
diff --git a/net/ricketyspace/sicp/one/thirtyeight.scm b/net/ricketyspace/sicp/one/thirtyeight.scm
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+;;;; Under Creative Commons Attribution-ShareAlike 4.0
+;;;; International. See
+;;;; <https://creativecommons.org/licenses/by-sa/4.0/>.
+
+(define-module (net ricketyspace sicp one thirtyeight)
+ #:use-module (net ricketyspace sicp one thirtyseven)
+ #:export (euler-minus-2))
+
+(define (euler-minus-2)
+ (define (n i) 1.0)
+ (define (d i) (cond ((= i 1) 1)
+ ((= (remainder i 3) 2) (* (+ (quotient i 3) 1) 2))
+ (else 1)))
+ (cont-frac-rec n d 21))
+
+;;; Guile REPL
+;;; scheme@(guile-user)> ,use (net ricketyspace sicp one thirtyeight)
+;;; scheme@(guile-user)> (euler-minus-2)
+;;; $25 = 0.7182818284590453