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talkquan

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dbb627

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talkquan: ½ð±Ò+10, ¡ï¡ï¡ï¡ï¡ï×î¼Ñ´ð°¸, ллÁË£¡ 2013-07-23 18:30:58
csgt0: ½ð±Ò+2, ¶àлָµ¼ 2013-07-24 17:03:22
>> syms x
>> fx=(3*pi)^0.5*(6*x^2-1)*exp(-3*x^2);%fxΪ±»»ý·Öº¯Êý%
>> fx1=int(fx,x,28.81,inf)

fx1 =

19916297312802753363/(225179981368524800*exp(24900483/10000)) + (2304326890293041*3^(1/2)*pi^(1/2)*erf((2881*3^(1/2))/100))/4503599627370496 + (2304326890293041*3^(1/2)*pi^(1/2)*erfi((2881*3^(1/2)*i)/100)*i)/4503599627370496

>> vpa(fx1,100)

ans =

0.0
The more you learn, the more you know, the more you know, and the more you forget. The more you forget, the less you know. So why bother to learn.
2Â¥2013-07-23 16:10:08
ÒÑÔÄ   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

talkquan

½û³æ (ÕýʽдÊÖ)

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3Â¥2013-07-23 16:33:38
ÒÑÔÄ   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

dbb627

ÈÙÓþ°æÖ÷ (ÖøÃûдÊÖ)

¡ï
csgt0: ½ð±Ò+1, лл 2013-07-24 17:03:56
ÒýÓûØÌû:
3Â¥: Originally posted by talkquan at 2013-07-23 16:33:38
ʲôÒâ˼°¡£¬matlab²Åѧ£¬²»¶®°¡£¬Âé·³½âÊÍÏ¿©...

¾ÍÊÇ»ý·Ö½á¹ûΪ0
erfi²Î¼û£¬ÎÒµÄmatlab°æ±¾µÍûÓж¨ÒåÕâ¸öº¯Êý£¬µ«ÊÇ»ý·ÖÖÐÈ´³öÏÖÁËºÜÆæ¹Ö
http://www.mathworks.cn/cn/help/symbolic/erfi.html
The more you learn, the more you know, the more you know, and the more you forget. The more you forget, the less you know. So why bother to learn.
4Â¥2013-07-23 16:54:13
ÒÑÔÄ   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

xiemingya

Í­³æ (СÓÐÃûÆø)

¡ï
csgt0: ½ð±Ò+1, лл 2013-07-24 17:04:00
µ±Ç󶨻ý·Öʱ£¬³öÏÖµÄÊÇʽ×Ó£¬ÊäÈëdouble(fx1)¼´¿ÉÇó³ö¶¨»ý·ÖµÄÖµ¡£
matlab»ý·Ö¼ÆËã
xiaomuchong002.PNG

» ±¾ÌûÒÑ»ñµÃµÄºì»¨£¨×îÐÂ10¶ä£©

5Â¥2013-07-24 14:06:24
ÒÑÔÄ   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

talkquan

½û³æ (ÕýʽдÊÖ)

Ëͺ컨һ¶ä
±¾ÌûÄÚÈݱ»ÆÁ±Î

6Â¥2013-07-24 15:08:43
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