{"action":"created","issue":{"url":"https://api.github.com/repos/JuliaLang/julia/issues/9816","labels_url":"https://api.github.com/repos/JuliaLang/julia/issues/9816/labels{/name}","comments_url":"https://api.github.com/repos/JuliaLang/julia/issues/9816/comments","events_url":"https://api.github.com/repos/JuliaLang/julia/issues/9816/events","html_url":"https://github.com/JuliaLang/julia/issues/9816","id":54647910,"number":9816,"title":"BigFloat overflow","user":{"login":"octonion","id":521890,"avatar_url":"https://avatars.githubusercontent.com/u/521890?v=3","gravatar_id":"","url":"https://api.github.com/users/octonion","html_url":"https://github.com/octonion","followers_url":"https://api.github.com/users/octonion/followers","following_url":"https://api.github.com/users/octonion/following{/other_user}","gists_url":"https://api.github.com/users/octonion/gists{/gist_id}","starred_url":"https://api.github.com/users/octonion/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/octonion/subscriptions","organizations_url":"https://api.github.com/users/octonion/orgs","repos_url":"https://api.github.com/users/octonion/repos","events_url":"https://api.github.com/users/octonion/events{/privacy}","received_events_url":"https://api.github.com/users/octonion/received_events","type":"User","site_admin":false},"labels":[],"state":"closed","locked":false,"assignee":null,"milestone":null,"comments":8,"created_at":"2015-01-17T02:42:39Z","updated_at":"2015-01-17T03:23:56Z","closed_at":"2015-01-17T03:06:40Z","body":"Looks like an exponent issue.\r\n\r\n```julia\r\njulia> x = BigFloat(2)\r\n2e+00 with 256 bits of precision\r\n\r\njulia> y = x^(2^29.999)\r\n2.147630010985401604264819292317090866477916691008148747595402140079551131402097e+323004529 with 256 bits of precision\r\n\r\njulia> y = x^(2^30)\r\ninf with 256 bits of precision\r\n```"},"comment":{"url":"https://api.github.com/repos/JuliaLang/julia/issues/comments/70352587","html_url":"https://github.com/JuliaLang/julia/issues/9816#issuecomment-70352587","issue_url":"https://api.github.com/repos/JuliaLang/julia/issues/9816","id":70352587,"user":{"login":"octonion","id":521890,"avatar_url":"https://avatars.githubusercontent.com/u/521890?v=3","gravatar_id":"","url":"https://api.github.com/users/octonion","html_url":"https://github.com/octonion","followers_url":"https://api.github.com/users/octonion/followers","following_url":"https://api.github.com/users/octonion/following{/other_user}","gists_url":"https://api.github.com/users/octonion/gists{/gist_id}","starred_url":"https://api.github.com/users/octonion/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/octonion/subscriptions","organizations_url":"https://api.github.com/users/octonion/orgs","repos_url":"https://api.github.com/users/octonion/repos","events_url":"https://api.github.com/users/octonion/events{/privacy}","received_events_url":"https://api.github.com/users/octonion/received_events","type":"User","site_admin":false},"created_at":"2015-01-17T03:23:56Z","updated_at":"2015-01-17T03:23:56Z","body":"My apologies; looks like that's the limit for BigFloat. Sage seems to use a 64-bit exponent.\r\n\r\n```python\r\nsage: x = 2.0\r\nsage: y = 2.0**61\r\nsage: x**y\r\n3.42801802478096e694127911065419641\r\n```"}}