https://bsd.neuroinf.jp/w/index.php?action=history&feed=atom&title=%E3%83%86%E3%83%B3%E3%83%97%E3%83%AC%E3%83%BC%E3%83%88%3AOom2 2026-04-17T17:32:14Z このウィキのこのページに関する変更履歴 MediaWiki 1.43.8 https://bsd.neuroinf.jp/w/index.php?title=%E3%83%86%E3%83%B3%E3%83%97%E3%83%AC%E3%83%BC%E3%83%88:Oom2&diff=29370&oldid=prev 2015-03-14T03:15:35Z

<p>1版</p> <p><b>新規ページ</b></p><div>&lt;includeonly&gt;{{#ifexpr:({{{1}}})&lt;0|number &lt;0|{{#ifexpr:({{{1}}})=0|-1E308|{{#expr:0+((ln({{{1}}})/ln2)round0){{#ifexpr:({{#ifexpr:(({{{1}}})&gt;2^52)and(((ln({{{1}}})/ln2)round0)&lt;63)|trunc(2^((ln({{{1}}})/ln2)round0))|2^((ln({{{1}}})/ln2)round0)}}&gt;({{{1}}}))or((({{{1}}})=2^63)and(({{{1}}})=trunc({{{1}}})))|-1}}}}}}}}&lt;/includeonly&gt;&lt;noinclude&gt;<br /> This template determines the log to the base 2, rounded down to an integer (binary [[w:order of magnitude|&#039;&#039;&#039;O&#039;&#039;&#039;rder &#039;&#039;&#039;O&#039;&#039;&#039;f &#039;&#039;&#039;M&#039;&#039;&#039;agnitude]]), of a number of type float. In other words, it determines the log to the base 2 of the number rounded down to a power of 2. <br /> <br /> The internally representable number should not be confused with the given decimal number:<br /> *{{xpsoc|oom2|3.9999999999999999}}<br /> Thus the template takes the input as representing an internally representable number, just like #expr does, as opposed to applying string operations to find the characters in the decimal notation and then find the required quantity for the exact decimal number.<br /> <br /> *{{xpsoc|oom2|1e2}}<br /> *{{xpsoc|oom2|1e3}}<br /> *{{xpsoc|oom2|1e4}}<br /> *{{xpsoc|oom2|1e5}}<br /> *{{xpsoc|oom2|1e6}}<br /> *{{xpsoc|oom2|1e7}}<br /> *{{xpsoc|oom2|1e8}}<br /> *{{xpsoc|oom2|1e9}}<br /> *{{xpsoc|oom2|1e10}}<br /> *{{xpsoc|oom2|1e11}}<br /> *{{xpsoc|oom2|1e12}}<br /> *{{xpsoc|oom2|1e13}}<br /> *{{xpsoc|oom2|1e14}}<br /> *{{xpsoc|oom2|1e15}}<br /> *{{xpsoc|oom2|1e16}}<br /> *{{xpsoc|oom2|1e17}}<br /> *{{xpsoc|oom2|1e18}}<br /> *{{xpsoc|oom2|1e19}}<br /> *{{xpsoc|oom2|1e20}}<br /> *{{xpsoc|oom2|trunc2^trunc53-trunc1}}<br /> *{{xpsoc|oom2|trunc2^trunc53}}<br /> *{{xpsoc|oom2|trunc2^trunc54-trunc1}}<br /> *{{xpsoc|oom2|trunc2^trunc54}}<br /> *{{xpsoc|oom2|trunc2^trunc55-trunc1}}<br /> *{{xpsoc|oom2|trunc2^trunc55}}<br /> *{{xpsoc|oom2|trunc2^trunc56-trunc1}}<br /> *{{xpsoc|oom2|trunc2^trunc56}}<br /> *{{xpsoc|oom2|trunc2^trunc57-trunc1}}<br /> *{{xpsoc|oom2|trunc2^trunc57}}<br /> *{{xpsoc|oom2|trunc2^trunc58-trunc1}}<br /> *{{xpsoc|oom2|trunc2^trunc58}}<br /> *{{xpsoc|oom2|trunc2^trunc59-trunc1}}<br /> *{{xpsoc|oom2|trunc2^trunc59}}<br /> *{{xpsoc|oom2|trunc2^trunc60-trunc1}}<br /> *{{xpsoc|oom2|trunc2^trunc60}}<br /> *{{xpsoc|oom2|trunc2^trunc61-trunc1}}<br /> *{{xpsoc|oom2|trunc2^trunc61}}<br /> *{{xpsoc|oom2|trunc2^trunc62-trunc1}}<br /> *{{xpsoc|oom2|trunc2^trunc62}}<br /> *{{xpsoc|oom2|trunc2^trunc62-trunc1+trunc2^trunc62}}<br /> *{{xpsoc|oom2|trunc2^trunc63}}<br /> *{{xpsoc|oom2|2^-900-2^-953}}<br /> *{{xpsoc|oom2|2^-900-2^-954}}<br /> **{{xpsoc|#expr:(2^-900-2^-954)-2^-900}}<br /> *{{xpsoc|oom2|2^1000-2^947}}<br /> *{{xpsoc|oom2|2^1000-2^946}}<br /> **{{xpsoc|#expr:(2^1000-2^946)-2^1000}}<br /> *{{xpsoc|oom2|2^1000}}<br /> *{{xpsoc|oom2|2^1001}}<br /> *{{xpsoc|oom2|2^1002}}<br /> *{{xpsoc|oom2|2^1003}}<br /> *{{xpsoc|oom2|2^1004}}<br /> *{{xpsoc|oom2|2^1005}}<br /> *{{xpsoc|oom2|2^1006}}<br /> *{{xpsoc|oom2|2^1007}}<br /> *{{xpsoc|oom2|2^1008}}<br /> *{{xpsoc|oom2|2^1009}}<br /> *{{xpsoc|oom2|2^1010}}<br /> *{{xpsoc|oom2|2^1011}}<br /> *{{xpsoc|oom2|2^1012}}<br /> *{{xpsoc|oom2|(2-2^-52)*2^1000}}<br /> *{{xpsoc|oom2|(2-2^-52)*2^1001}}<br /> *{{xpsoc|oom2|(2-2^-52)*2^1002}}<br /> *{{xpsoc|oom2|(2-2^-52)*2^1003}}<br /> *{{xpsoc|oom2|(2-2^-52)*2^1004}}<br /> *{{xpsoc|oom2|(2-2^-52)*2^1005}}<br /> *{{xpsoc|oom2|(2-2^-52)*2^1006}}<br /> *{{xpsoc|oom2|(2-2^-52)*2^1007}}<br /> *{{xpsoc|oom2|(2-2^-52)*2^1008}}<br /> *{{xpsoc|oom2|(2-2^-52)*2^1009}}<br /> *{{xpsoc|oom2|(2-2^-52)*2^1010}}<br /> *{{xpsoc|oom2|(2-2^-52)*2^1011}}<br /> *{{xpsoc|oom2|(2-2^-52)*2^1023}}<br /> *{{xpsoc|oom2|(2-2^-52)*2^1023}}<br /> *{{xpsoc|oom2|(2-2^-52)*2^1023}}<br /> *{{xpsoc|oom2|2^1024}}<br /> *{{xpsoc|oom2|2^-1074}}<br /> *{{xpsoc|oom2|2^-1075}}<br /> *{{xpsoc|oom2|0}}<br /> <br /> *&lt;code&gt;&lt;nowiki&gt;{{#expr:2^{{oom2|2^-1075}}}}&lt;/nowiki&gt;&lt;/code&gt; → {{#expr:2^{{oom2|2^-1075}}}}<br /> *&lt;code&gt;&lt;nowiki&gt;{{#expr:2^{{oom2|0}}}}&lt;/nowiki&gt;&lt;/code&gt; → {{#expr:2^{{oom2|0}}}}<br /> <br /> *{{xpsoc|oom2|2^61}}<br /> *{{xpsoc|oom2|trunc(2^62-512)+trunc511}}<br /> *{{xpsoc|oom2|2^62}}<br /> *{{xpsoc|oom2|1.5*2^62}}<br /> *{{xpsoc|oom2|trunc(2^63-1024)+trunc1023}}<br /> *{{xpsoc|oom2|1.5*2^63}}<br /> <br /> [[Category:Mathematical templates|{{PAGENAME}}]]<br /> &lt;/noinclude&gt;</div>

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