blocks|key|5689370|text|一个perl+one内联程序：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5689371|perl+-e+'print+log($ARGV[0])/log(10),"\n"'+3e-320|code-block|syntax|javascript|5689372|输出：|offset|length|style|BOLD|5689373|-319.522883580228|5689374|entityMap^0|0|0|0|3|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|S|8|@$I|T|J|U|K|L]]|9|@]|A|$]]|$1|M|3|N|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

A perl one liner:

<pre><code>perl -e 'print log($ARGV[0])/log(10),"\n"' 3e-320
</code></pre>

output:

<pre><code>-319.522883580228
</code></pre>

blocks|key|5205640|text|在R中：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5205641|x+<-+3e-320
log10(x)
#-319.5229

y+<-+3*exp(-320)
log10(y)
#-138.4971|code-block|syntax|javascript|5205642|对于大指数：|5205643|library(Brobdingnag)
x+<-+3*as.brob(10)%5E(-1000)
log10(x)
#-999.5229

y+<-+3*as.brob(exp(1))%5E(-1000)
log10(y)
#-433.8174|5205644|或者：|5205645|log10(3)-1000
#-999.5229|5205646|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|S|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|U|8|@]|9|@]|A|$]]|$1|M|3|N|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

In R:

<pre><code>x &lt;- 3e-320
log10(x)
#-319.5229

y &lt;- 3*exp(-320)
log10(y)
#-138.4971
</code></pre>

For big exponents:

<pre><code>library(Brobdingnag)
x &lt;- 3*as.brob(10)^(-1000)
log10(x)
#-999.5229

y &lt;- 3*as.brob(exp(1))^(-1000)
log10(y)
#-433.8174
</code></pre>

Or:

<pre><code>log10(3)-1000
#-999.5229
</code></pre>

blocks|key|1854805|text|在Python中：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1854806|import+math
math.log10(3e-320)|code-block|syntax|javascript|1854807|返回|1854808|-319.5228835802284|1854809|要以非常小的值获取有关Python功能的更多信息：|1854810|import+sys
sys.float_info|1854811|返回(取决于您的系统)：|1854812|sys.float_info(max=1.7976931348623157e%2B308,
+++++++++++++++max_exp=1024,
+++++++++++++++max_10_exp=308,
+++++++++++++++min=2.2250738585072014e-308,
+++++++++++++++min_exp=-1021,
+++++++++++++++min_10_exp=-307,
+++++++++++++++dig=15,
+++++++++++++++mant_dig=53,
+++++++++++++++epsilon=2.220446049250313e-16,
+++++++++++++++radix=2,
+++++++++++++++rounds=1)|1854813|当math.log10(3e-320)返回正确的值时，math.log10(3e-325)会引发一个ValueError:+math+domain+error。|offset|length|style|CODE|1854814|entityMap^0|0|0|0|0|0|0|0|0|1|I|R|I|1E|T|0^^$0|@$1|2|3|4|5|6|7|10|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|11|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|12|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|13|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|14|8|@]|9|@]|A|$]]|$1|M|3|N|5|D|7|15|8|@]|9|@]|A|$E|F]]|$1|O|3|P|5|6|7|16|8|@]|9|@]|A|$]]|$1|Q|3|R|5|D|7|17|8|@]|9|@]|A|$E|F]]|$1|S|3|T|5|6|7|18|8|@$U|19|V|1A|W|X]|$U|1B|V|1C|W|X]|$U|1D|V|1E|W|X]]|9|@]|A|$]]|$1|Y|3|-4|5|6|7|1F|8|@]|9|@]|A|$]]]|Z|$]]

In Python:

<pre><code>import math
math.log10(3e-320)
</code></pre>

returns

<pre><code>-319.5228835802284
</code></pre>

To get more information about Python abilities in very small values:

<pre><code>import sys
sys.float_info
</code></pre>

returns (depends on your system):

<pre><code>sys.float_info(max=1.7976931348623157e+308,
 max_exp=1024,
 max_10_exp=308,
 min=2.2250738585072014e-308,
 min_exp=-1021,
 min_10_exp=-307,
 dig=15,
 mant_dig=53,
 epsilon=2.220446049250313e-16,
 radix=2,
 rounds=1)
</code></pre>

While <code>math.log10(3e-320)</code> returns the correct value, <code>math.log10(3e-325)</code> raises a <code>ValueError: math domain error</code>.

blocks|key|1854887|text|从其他答案可以看出，更好的公式是-log10(值)，或者，在OpenOffice计算电子表格中，=-LOG(值，10)。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1854888|但是，您需要确保输入的值不会下溢到0。-LOG(3E-178,10)工作(177.522879)，但-LOG(+1E-320+,10)失败，因为1E-320下溢到0，并且出现错误。502。(这可能就是您使用1/value也爆炸式增长的原因。)|1854889|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

As you should be able to tell from the other answers, a better formula is -log10(value) or, in an OpenOffice Calc spreadsheet, =-LOG(value,10).

You need to make certain that the value entered does not underflow to 0, however. -LOG(3E-178,10) works (177.522879), but -LOG(1E-320,10) fails because 1E-320 underflows to 0 and an Err.502 is presented. (That's probably why your use of 1/value exploded too.)

blocks|key|1854854|text|您可以使用decimal+module+in+Python计算任意精度的log10，例如，使用默认精度：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1854855|from+decimal+import+Decimal+as+D

for+f+in+[3e-178,+1e-320,+3e-320,+"1e-325",+"3e-325"]:
+++++print("%25s\t%25s"+%25+(f,+D(f).log10()))|code-block|syntax|javascript|1854856|Output|1854857|3e-178++-177.5228787452803375835172220
1e-320++-320.0000048349480421542963792
3e-320++-319.5228835802283797170013513
1e-325++-325
3e-325++-324.5228787452803375627049721|1854858|或者：|1854859|import+decimal

decimal.getcontext().prec+=+70
for+f+in+[3e-178,+1e-320,+3e-320,+"1e-325",+"3e-325"]:
+++++print("%25s\t%25s"+%25+(f,+decimal.Decimal(f).log10()))|1854860|1854861|3e-178++-177.5228787452803375835172220093158130425818111446701314507791687173572
1e-320++-320.0000048349480421542963791664378178773271498211156984605956663618384
3e-320++-319.5228835802283797170013512631827025681270209569250025957658007215332
1e-325++-325
3e-325++-324.5228787452803375627049720967448846907998711358093041351701343596948|1854862|entityMap|0|LINK|mutability|MUTABLE|url|http://docs.python.org/2/library/decimal.html|1|http://ideone.com/iIq39W|2|http://ideone.com/1Gb3pR^0|5|7|5|O|0|0|0|0|6|1|0|0|0|0|0|6|2|0|0^^$0|@$1|2|3|4|5|6|7|17|8|@$9|18|A|19|B|C]]|D|@$9|1A|A|1B|1|1C]]|E|$]]|$1|F|3|G|5|H|7|1D|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|1E|8|@]|D|@$9|1F|A|1G|1|1H]]|E|$]]|$1|M|3|N|5|H|7|1I|8|@]|D|@]|E|$I|J]]|$1|O|3|P|5|6|7|1J|8|@]|D|@]|E|$]]|$1|Q|3|R|5|H|7|1K|8|@]|D|@]|E|$I|J]]|$1|S|3|L|5|6|7|1L|8|@]|D|@$9|1M|A|1N|1|1O]]|E|$]]|$1|T|3|U|5|H|7|1P|8|@]|D|@]|E|$I|J]]|$1|V|3|-4|5|6|7|1Q|8|@]|D|@]|E|$]]]|W|$X|$5|Y|Z|10|E|$11|12]]|13|$5|Y|Z|10|E|$11|14]]|15|$5|Y|Z|10|E|$11|16]]]]

You could compute log10 with arbitrary precision using <a href="http://docs.python.org/2/library/decimal.html" rel="nofollow"><code>decimal</code> module in Python</a> e.g., using default precision:



<pre><code>from decimal import Decimal as D

for f in [3e-178, 1e-320, 3e-320, "1e-325", "3e-325"]:
 print("%s\t%s" % (f, D(f).log10()))
</code></pre>

<a href="http://ideone.com/iIq39W" rel="nofollow">Output</a>

<pre><code>3e-178 -177.5228787452803375835172220
1e-320 -320.0000048349480421542963792
3e-320 -319.5228835802283797170013513
1e-325 -325
3e-325 -324.5228787452803375627049721
</code></pre>

Or:

<pre><code>import decimal

decimal.getcontext().prec = 70
for f in [3e-178, 1e-320, 3e-320, "1e-325", "3e-325"]:
 print("%s\t%s" % (f, decimal.Decimal(f).log10()))
</code></pre>

<a href="http://ideone.com/1Gb3pR" rel="nofollow">Output</a>

<pre><code>3e-178 -177.5228787452803375835172220093158130425818111446701314507791687173572
1e-320 -320.0000048349480421542963791664378178773271498211156984605956663618384
3e-320 -319.5228835802283797170013512631827025681270209569250025957658007215332
1e-325 -325
3e-325 -324.5228787452803375627049720967448846907998711358093041351701343596948
</code></pre>

Is there a way to compute -log10values. 

Where values are very small i.e., 3*e-178 or e-320.

I have tried open office with the formula log((1/value),10), it works fine but when it encounters extremely small values it gives error like division by zero not possible.

I guess same will happen when I will use perl or python or R.

Kindly help in converting these values to -log10value

Thank you

Note: I want to compute minus log of value with base 10

computing -log10 of very small values

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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有没有办法计算-log10values。其中值非常小，即3*e-178或e-320。我试过用公式log((1/value),10)打开办公室，它工作得很好，但当它遇到非常小的值时，它会给出错误，比如不可能除以零。我想当我使用perl、python或R时，也会发生同样的事情。请帮助将这些值转换为-log10value谢谢注意:我想计算以10为底的值的负对数值

问计算非常小的值的-log10
EN

回答 5

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问计算非常小的值的-log10EN

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问计算非常小的值的-log10
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