{"id":3611,"date":"2022-08-30T13:45:24","date_gmt":"2022-08-30T04:45:24","guid":{"rendered":"https:\/\/home.hirosaki-u.ac.jp\/relativity\/?p=3611"},"modified":"2025-06-07T10:26:19","modified_gmt":"2025-06-07T01:26:19","slug":"gnuplot-%e3%81%a7%e5%b0%84%e6%96%b9%e6%8a%95%e5%b0%84%e3%81%ae%e9%80%9f%e5%ba%a6%e3%83%99%e3%82%af%e3%83%88%e3%83%ab%e3%81%a8%e8%bb%8c%e9%81%93%e3%82%92%e6%8f%8f%e3%81%8f","status":"publish","type":"post","link":"https:\/\/home.hirosaki-u.ac.jp\/relativity\/3611\/","title":{"rendered":"gnuplot \u3067\u659c\u65b9\u6295\u5c04\u306e\u901f\u5ea6\u30d9\u30af\u30c8\u30eb\u3068\u8ecc\u9053\u3092\u63cf\u304f"},"content":{"rendered":"

\u30c7\u30fc\u30bf\u30d5\u30a1\u30a4\u30eb\u3092\u4f7f\u3063\u3066 gnuplot \u3067\u30d9\u30af\u30c8\u30eb\u3092\u63cf\u304f\u4f8b\u3002\u5099\u5fd8\u9332\u3068\u3057\u3066\u3002<\/p>\n

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$\\theta = 45$\u00b0 \u306e\u659c\u65b9\u6295\u5c04\u3092\u898f\u683c\u5316\u3057\u305f\u6642\u9593\u3068\u5ea7\u6a19\u3067\u66f8\u304f\u3068\u3053\u3093\u306a\u611f\u3058\u3002<\/p>\n<\/div>\n<\/div>\n<\/div>\n

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In [1]:<\/div>\n
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x<\/span>(t) =<\/span> 2<\/span> *<\/span> t<\/span>\r\ny<\/span>(t) =<\/span> 2<\/span> *<\/span> t<\/span> -<\/span> t<\/span>**<\/span>2<\/span>\r\n\r\nvx<\/span>(t) =<\/span> 2<\/span>\r\nvy<\/span>(t) =<\/span> 2<\/span> -<\/span> 2<\/span>*<\/span>t<\/span>\r\n<\/pre>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
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\u30d9\u30af\u30c8\u30eb\u306e\u4f5c\u56f3\u7528\u306b\u30c7\u30fc\u30bf\u30d5\u30a1\u30a4\u30eb\u3092\u4f5c\u6210\u3059\u308b\u3002<\/p>\n<\/div>\n<\/div>\n<\/div>\n
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In [2]:<\/div>\n
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s<\/span> =<\/span> 0.2<\/span>\r\nset<\/span> print<\/span> \"v.txt\"<\/span>\r\n  print<\/span> \"# x     y     vx    vy\"<\/span>\r\n  do<\/span> for<\/span> [<\/span>i<\/span>=<\/span>0<\/span>:<\/span>4<\/span>]{<\/span>\r\n    t<\/span> =<\/span> 0.5<\/span> *<\/span> i<\/span>\r\n    print<\/span> sprintf<\/span>(<\/span>\"%5.2f %5.2f %5.2f %5.2f\"<\/span>,<\/span> \\\r\n                  x<\/span>(<\/span>t<\/span>)<\/span>,<\/span> y<\/span>(<\/span>t<\/span>)<\/span>,<\/span> s<\/span>*<\/span>vx<\/span>(<\/span>t<\/span>)<\/span>,<\/span> s<\/span>*<\/span>vy<\/span>(<\/span>t<\/span>))<\/span>\r\n    }<\/span>\r\nset<\/span> print<\/span>\r\n<\/pre>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
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\u30c7\u30fc\u30bf\u30d5\u30a1\u30a4\u30eb\u306e\u4e2d\u8eab\u306e\u78ba\u8a8d\u3002<\/p>\n<\/div>\n<\/div>\n<\/div>\n
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In [3]:<\/div>\n
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!<\/span> cat<\/span> v.txt<\/span>\r\n<\/pre>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
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# x     y     vx    vy\r\n 0.00  0.00  0.40  0.40\r\n 1.00  0.75  0.40  0.20\r\n 2.00  1.00  0.40  0.00\r\n 3.00  0.75  0.40 -0.20\r\n 4.00  0.00  0.40 -0.40\r\n\r\n<\/pre>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
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In [4]:<\/div>\n
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set<\/span> parametric<\/span>\r\nset<\/span> grid<\/span>\r\nset<\/span> zeroaxis<\/span>\r\nset<\/span> key<\/span> samplen<\/span> 1<\/span>\r\nset<\/span> xrange<\/span> [<\/span>-0<\/span>.5<\/span>:<\/span>4.5<\/span>]<\/span>\r\nset<\/span> yrange<\/span> [<\/span>-0<\/span>.5<\/span>:<\/span>2<\/span>]<\/span>\r\nset<\/span> size<\/span> ratio<\/span> 0.5<\/span>\r\nset<\/span> title<\/span> \"\u659c\u65b9\u6295\u5c04\u306e\u901f\u5ea6\u30d9\u30af\u30c8\u30eb\u3068\u8ecc\u9053\"<\/span>\r\n\r\nplot<\/span> [<\/span>t<\/span>=<\/span>0<\/span>:<\/span>2<\/span>]<\/span> x<\/span>(<\/span>t<\/span>)<\/span>,<\/span> y<\/span>(<\/span>t<\/span>)<\/span> lw<\/span> 2<\/span> notitle<\/span>,<\/span> \\\r\n  \"v.txt\"<\/span> u<\/span> 1<\/span>:<\/span>2<\/span>:<\/span>3<\/span>:<\/span>(<\/span>0<\/span>)<\/span> w<\/span> vec<\/span> filled<\/span> head<\/span> lc<\/span> \"blue\"<\/span> lw<\/span> 1.5<\/span> t<\/span> \"\u901f\u5ea6\u306e x \u6210\u5206\"<\/span>,<\/span>\\\r\n  \"\"<\/span> u<\/span> 1<\/span>:<\/span>2<\/span>:<\/span>(<\/span>0<\/span>)<\/span>:<\/span>4<\/span> w<\/span> vec<\/span> filled<\/span> head<\/span> lc<\/span> \"red\"<\/span> lw<\/span> 1.5<\/span> t<\/span> \"\u901f\u5ea6\u306e y \u6210\u5206\"<\/span>,<\/span>\\\r\n  \"\"<\/span> u<\/span> 1<\/span>:<\/span>2<\/span>:<\/span>3<\/span>:<\/span>4<\/span> w<\/span> vec<\/span> filled<\/span> head<\/span> lw<\/span> 2<\/span> lc<\/span> \"black\"<\/span> t<\/span> \"\u901f\u5ea6\u30d9\u30af\u30c8\u30eb\"<\/span>,<\/span>\\\r\n  \"\"<\/span> u<\/span> 1<\/span>:<\/span>2<\/span> w<\/span> p<\/span> pt<\/span> 6<\/span> pointsize<\/span> 0.7<\/span> lc<\/span> \"dark-green\"<\/span> notitle<\/span>\r\n<\/pre>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
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\"\"<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"
\u30c7\u30fc\u30bf\u30d5\u30a1\u30a4\u30eb\u3092\u4f7f\u3063\u3066 gnuplot \u3067\u30d9\u30af\u30c8\u30eb\u3092\u63cf\u304f\u4f8b\u3002\u5099\u5fd8\u9332\u3068\u3057\u3066\u3002<\/p>
\u7d9a\u304d\u3092\u8aad\u3080<\/a><\/p>\n","protected":false},"author":33,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"inline_featured_image":false,"footnotes":""},"categories":[15,25],"tags":[],"class_list":["post-3611","post","type-post","status-publish","format-standard","hentry","category-gnuplot","category-25","nodate","item-wrap"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t