网站流量统计指标大致分为3类： 1.网站流量 独立访问者数量（unique visitors，UV） 重复访问者数量（repeat visitors） 页面浏览数（page views，PV） 每个访问者的页面浏览数（page views ...

……android-sdk\temp\build-tools_r20-windows.zip (拒绝访问。) 拒绝访问，好吧，多试试呢？还是拒绝…… 那就用管理员权限吧！ 右键SDK Manager.exe，并选择“以管理员身份运行”，接着点...

1.为什么会有树？因为当有大量的输入数据时，链表的线性访问时间就显得略长了。而树结构，其大部分操作的运行时间平均为O(logN)。 2.树的实现并不难，几行代码就搞定了。 struct TreeNode { ...

练习3-61 原文 代码 (define (reciprocal-series s) (cons-stream 1 (scale-stream (mul-series (stream-cdr s) (reciprocal-series s)) -1))) 感谢访问，希望对您有所帮助。 欢迎关注或收藏...

练习3-70 原文 代码 (define (merge-weighted s1 s2 weight) (cond ((stream-null? s1) s2) ((stream-null? s2) s1) (else (let ((cars1 (stream-car s1)) (cars2 (stream-car s2))) (cond (...

练习3-28 原文 Exercise 3.28. Define an or-gate as a primitive function box. Your or-gate constructor should be similar to and-gate. 代码 (define (or-gate input-1 input-2 output)...

这些关于Scheme的基本知识在【Scheme归纳】系列博文总都有介绍。 (define (equal? x y) (cond ((and (symbol? x) (symbol? y)) (symbol-equal? x y)) ((and (list? x) (list? y)) (list-equa...

练习3-72 原文 Exercise 3.72. In a similar way to exercise 3.71 generate a stream of all numbers that can be written as the sum of two squares in three different ways (showing h...

练习2.75 通过模仿书上的make-from-real-imag函数来完成此题。 (define (make-from-mag-ang x y) (define (dispatch op) (cond ((eq? op ‘real-part) (* x (cos y))) ((eq? op ‘imag-part...

练习3-58 原文 Exercise 3.58. Give an interpretation of the stream computed by the following procedure: (define (expand num den radix) (cons-stream (quotient (* num radix) den) ...

练习3-82 原文 Exercise 3.82. Redo exercise 3.5 on Monte Carlo integration in terms of streams. The stream version of estimate-integral will not have an argument telling how man...

练习3-59 原文 代码 a) (define (integrate-series s) (stream-map * (stream-map / ones integers) s)) b) (define sine-series (cons-stream 0 (integrate-series cosine-series))) (defin...

练习3-69 原文 代码 (define (triples s t u) (cons-stream (list (stream-car s) (stream-car t) (stream-car u)) (interleave (stream-map (lambda (x) (cons (stream-car s) x)) (stream...

练习2.67 我们先来把该导入的导入，然后就来测试了。 (load "d:\\lisp\\tree.scm") (define sample-tree (make-code-tree (make-leaf 'A 4) (make-code-tree (make-leaf 'B 2) (make-code-t...

练习4-3 原文 Exercise 4.3. Rewrite eval so that the dispatch is done in data-directed style. Compare this with the datadirected differentiation procedure of exercise 2.73. (You ...

练习3-55 原文 Exercise 3.55. Define a procedure partial-sums that takes as argument a stream S and returns the stream whose elements are S0, S0 + S1, S0 + S1 + S2, …. For examp...

练习3-71 原文 代码 (define (Ramanujan s) (define (stream-cadr s) (stream-car (stream-cdr s))) (define (stream-cddr s) (stream-cdr (stream-cdr s))) (let ((scar (stream-car s)) (s...

练习2.59 我们可以采用迭代来完成这个过程，至于怎么迭代的，接下来就是代码了。 (define (union-set set1 set2) (define (union-set-iter set1 set2) (if (null? input) (reverse result) ...

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练习2.58 如果要由前序变成中序那就要有些大变动了。 (define (make-sum a1 a2) (cond ((=number? a1 0) a2) ((=number? a2 0) a1) ((and (number? a1) (number? a2)) (+ a1 a2)) (else (li...