{"type":"rich","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fmoremagic.hateblo.jp%2Fentry%2F2018%2F05%2F29%2F102331\" title=\"gaushe \u3067\u5171\u5206\u6563\u3092\u8a08\u7b97\u3057\u3066\u307f\u308b - moremagic\u2019s diary\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","title":"gaushe \u3067\u5171\u5206\u6563\u3092\u8a08\u7b97\u3057\u3066\u307f\u308b","url":"https://moremagic.hateblo.jp/entry/2018/05/29/102331","provider_name":"Hatena Blog","blog_title":"moremagic\u2019s diary","width":"100%","author_name":"moremagic","provider_url":"https://hatena.blog","image_url":null,"published":"2018-05-29 10:23:31","version":"1.0","categories":["Lisp"],"height":"190","blog_url":"https://moremagic.hateblo.jp/","author_url":"https://blog.hatena.ne.jp/moremagic/","description":"\u6570\u5b66\u82e6\u624b\u306a\u30ef\u30b7\u3002\u4ee5\u4e0b\u306e\u30da\u30fc\u30b8\u3092\u53c2\u8003\u306b\u5171\u5206\u6563\u3092\u5b66\u3076 https://mathtrain.jp/covariance ;; \u56fd\u8a9e\u30fb\u6570\u5b66 \u306e\u70b9\u6570\u30bb\u30c3\u30c8 (define lst '((50 50) (50 70) (80 60) (70 90) (90 100))) (define (sum lst) (cond ((null? lst) 0) (#t (+ (car lst) (sum (cdr lst))))) (define (ave lst) (/ (sum lst) (length lst))) (define (first-list lst) (map car lst)) ;; \u56fd\u8a9e (d\u2026"}