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wurongjun

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Å·À­³£Êý¿ÉÒÔÕâÑù¼ÆËã:
>> int(-log(x)*exp(-x),x,0,inf)

ans =

eulergamma
ÉÆ¶ñµ½Í·ÖÕÓб¨,È˼äÕýµÀÊDz×É£.
4Â¥2016-03-20 11:59:24
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû
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wurongjun

ר¼Ò¹ËÎÊ (Ö°Òµ×÷¼Ò)

¡¾´ð°¸¡¿Ó¦Öú»ØÌû

¸Ðл²ÎÓ룬ӦÖúÖ¸Êý +1
doubleһϾÍÐÐÀ²!
>> syms x
>> int(log(x)*exp(-x)/sqrt(x),x,0,inf)

ans =

-pi^(1/2)*eulergamma-2*pi^(1/2)*log(2)

>> double(ans)

ans =

   -3.4802

>>
ÉÆ¶ñµ½Í·ÖÕÓб¨,È˼äÕýµÀÊDz×É£.
2Â¥2016-03-20 11:20:20
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

iάÊý

ľ³æ (ÕýʽдÊÖ)

ÒýÓûØÌû:
2Â¥: Originally posted by wurongjun at 2016-03-20 11:20:20
doubleһϾÍÐÐÀ²!
>> syms x
>> int(log(x)*exp(-x)/sqrt(x),x,0,inf)

ans =

-pi^(1/2)*eulergamma-2*pi^(1/2)*log(2)

>> double(ans)

ans =

   -3.4802

>>

ÎÒÏëÖªµÀ¹ý³ÌÊÇÔõôËãµÄ£¬Ð»Ð»£¡
3Â¥2016-03-20 11:28:56
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

Edstrayer

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