{"id":1437,"date":"2021-10-04T12:07:31","date_gmt":"2021-10-04T03:07:31","guid":{"rendered":"http:\/\/www.miyamoto-lab.com\/?page_id=1437"},"modified":"2022-10-02T12:07:30","modified_gmt":"2022-10-02T03:07:30","slug":"3813487qwe","status":"publish","type":"page","link":"https:\/\/www.miyamoto-lab.com\/ja\/3813487qwe\/","title":{"rendered":"4. 4\u7ae0\u306e\u7b54\u3048"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">\uff08\u4ee5\u4e0b\u3067\u306f\u3001\u958b\u767a\u74b0\u5883\u304c\u624b\u5143\u306b\u306a\u3044\u5834\u5408\u306f\u3001<a href=\"https:\/\/www.codechef.com\/ide\"><a href=\"https:\/\/paiza.io\/ja\/projects\/new?language=c\">paiza.io<\/a>,\u00a0<a href=\"https:\/\/www.onlinegdb.com\/online_c_compiler\">onlineGDB<\/a>,\u00a0<a href=\"https:\/\/www.programiz.com\/c-programming\/online-compiler\/\">programiz,\u00a0<\/a><a href=\"https:\/\/www.codechef.com\/ide\">codechef.com<\/a>,\u00a0<a href=\"https:\/\/ideone.com\/\">ideone.com<\/a>,\u00a0<a href=\"https:\/\/paiza.io\/\">paiza.io<\/a><\/a>\u306a\u3069\u3092\u5b9f\u884c\u3057\u3066\u307f\u308b\u3068\u826f\u3044\u3002\uff09<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4f8b\u3048\u3070\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u3082\u306e\u306b\u306a\u308b<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-c\" data-lang=\"C\"><code>#include &lt;stdio.h&gt;\n#include &lt;math.h&gt;\n#define N 1000\n#define h 1.0\ndouble f(double t,double x, double y);\ndouble g(double t,double x, double y);\nint main(void) {\n  int i;\n  double x=1000.0;\n  double y=100.0;\n  double t=0.0;\n  double kx1,ky1,kx2,ky2,kx3,ky3,kx4,ky4;\n  for (i = 0; i &lt; N; i++) {\n    kx1=h*f(t,x,y);ky1=h*g(t,x,y);\n    kx2=h*f(t+0.5*h,x+kx1*0.5,y+ky1*0.5);ky2=h*g(t+0.5*h,x+kx1*0.5,y+ky1*0.5);\n    kx3=h*f(t+0.5*h,x+kx2*0.5,y+ky2*0.5);ky3=h*g(t+0.5*h,x+kx2*0.5,y+ky2*0.5);\n    kx4=h*f(t+h,x+kx3,y+ky3);ky4=h*g(t+h,x+kx3,y+ky3);\n    x=x+(kx1+2.0*kx2+2.0*kx3+kx4)\/6.0;\n    y=y+(ky1+2.0*ky2+2.0*ky3+ky4)\/6.0;\n    t=t+h;\n    printf(&quot;%4.4lf\\t %4.4lf\\t %e\\n&quot;,x,y,t);\n    }\n}\ndouble f(double t,double x, double y) {\n  return (0.01*x-0.00001*x*y);\n}\ndouble g(double t,double x, double y) {\n  return (-0.02*y+0.00001*x*y);\n}\n\n<\/code><\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u3053\u306e\u7d50\u679c\u304c<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">1009.0456 99.0095 0<br>1018.1831 98.0376 1<br>1027.4132 97.0843 2<br>1036.7367 96.1491 3<br>1046.1546 95.2318 4<br>1055.6675 94.3323 5<br>1065.2765 93.4501 6<br>1074.9824 92.5852 7<br>1084.7859 91.7372 8<br>1094.6881 90.9059 9<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u306e\u3088\u3046\u306b\u306a\u3063\u3066\u3044\u308c\u3070\u3001\u8a08\u7b97\u306f\u3067\u304d\u3066\u3044\u308b\u30021000\u56de\u304f\u3089\u3044\u7e70\u308a\u8fd4\u3059\u3068\u3001<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" width=\"694\" height=\"304\" src=\"https:\/\/www.miyamoto-lab.com\/wp-content\/uploads\/2020\/09\/rg3.png\" alt=\"\" class=\"wp-image-291\" srcset=\"https:\/\/www.miyamoto-lab.com\/wp-content\/uploads\/2020\/09\/rg3.png 694w, https:\/\/www.miyamoto-lab.com\/wp-content\/uploads\/2020\/09\/rg3-300x131.png 300w\" sizes=\"auto, (max-width: 694px) 100vw, 694px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u306e\u3088\u3046\u306a\u990c\u3068\u6355\u98df\u8005\u306e\u5909\u52d5\u306e\u5468\u671f\u7684\u306a\u95a2\u4fc2\u3092\u898b\u308b\u3053\u3068\u304c\u3067\u304d\u308b\uff08\u30e2\u30c7\u30eb\u3084\u30d1\u30e9\u30e1\u30bf\u306e\u554f\u984c\u70b9\u306f\u8b70\u8ad6\u3057\u306a\u3044\uff09\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u3053\u308c\u3067\u5e38\u5fae\u5206\u65b9\u7a0b\u5f0f\u306b\u57fa\u3065\u3044\u305f\u3001\u3055\u307e\u3056\u307e\u306a\u7269\u7406\u30b7\u30df\u30e5\u30ec\u30fc\u30b7\u30e7\u30f3\u3092\u5b9f\u65bd\u3059\u308b\u305f\u3081\u306e\u57fa\u790e\u7684\u306a\u77e5\u8b58\u306f\u8eab\u306b\u4ed8\u3044\u305f\u3002\u306a\u304a\u3001\u4e0a\u8a18\u306e\u30b3\u30fc\u30c9\u306f\u3001\u30dd\u30a4\u30f3\u30bf\u306e\u6982\u5ff5\u3092\u4f7f\u3048\u3070\u95a2\u6570\u306e\u8aad\u307f\u51fa\u3057\u306e\u90e8\u5206\u3067\u65ad\u7136\u7c21\u7d20\u5316\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u306e\u3067\u3001\u8208\u5473\u306e\u3042\u308b\u4eba\u306f\u3084\u3063\u3066\u307f\u3088\u3046\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\uff08\u4ee5\u4e0b\u3067\u306f\u3001\u958b\u767a\u74b0\u5883\u304c\u624b\u5143\u306b\u306a\u3044\u5834\u5408\u306f\u3001paiza.io,\u00a0onlineGDB,\u00a0programiz,\u00a0codechef.com,\u00a0ideone.com,\u00a0paiza.io\u306a\u3069\u3092\u5b9f\u884c\u3057\u3066\u307f\u308b\u3068\u826f\u3044\u3002\uff09 \u4f8b\u3048\u3070\u4ee5\u4e0b\u306e\u3088\u3046\u306a [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_locale":"ja","_original_post":"http:\/\/www.miyamoto-lab.com\/?page_id=1437","footnotes":""},"class_list":["post-1437","page","type-page","status-publish","hentry","ja"],"_links":{"self":[{"href":"https:\/\/www.miyamoto-lab.com\/wp-json\/wp\/v2\/pages\/1437","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.miyamoto-lab.com\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.miyamoto-lab.com\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.miyamoto-lab.com\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/www.miyamoto-lab.com\/wp-json\/wp\/v2\/comments?post=1437"}],"version-history":[{"count":5,"href":"https:\/\/www.miyamoto-lab.com\/wp-json\/wp\/v2\/pages\/1437\/revisions"}],"predecessor-version":[{"id":1666,"href":"https:\/\/www.miyamoto-lab.com\/wp-json\/wp\/v2\/pages\/1437\/revisions\/1666"}],"wp:attachment":[{"href":"https:\/\/www.miyamoto-lab.com\/wp-json\/wp\/v2\/media?parent=1437"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}