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3Â¥2014-07-29 22:36:55
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shadow004: ½ð±Ò+10, ¡ï¡ï¡ï¡ï¡ï×î¼Ñ´ð°¸ 2014-07-28 23:29:14
MATLAB:
quadgk(@(x) sin(x).*exp(-0.2498e-1*(x-77*pi*(1/180)).^2),0,pi)

ans =1.9745


quadgk(@(x) exp(-0.2498e-1*(x-37*pi*(1/180)).^2),0,2*pi)

ans =5.0864

» ±¾ÌûÒÑ»ñµÃµÄºì»¨£¨×îÐÂ10¶ä£©

MATLAB¡¢MSСÎÊÌâ¡¢ÆÕͨÎÊÌâÇë·¢ÌûÇóÖú£¡Ê±¼ä¾«Á¦ÓÐÏÞ£¬Ë¡²»½ÓÊÜÎÞ³¥Ë½ÐÅÇóÖú¡£
2Â¥2014-07-28 20:24:50
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3Â¥: Originally posted by shadow004 at 2014-07-29 22:36:55
µÚÒ»¸ö¹«Ê½µÄÊäÈëºÃÏñÓеãÎÊÌ⣬ÎÒ°ÑԭʽºÍ´ð°¸¸½ÉÏ£¬Âé·³Äú°ïÎÒ¿´Ò»ÏÂ

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quadgk(@(x) sin(x).*exp(-1.677*0.5*0.0305*180*180/pi/pi*(x-77*pi*(1/180)).^2),0,pi)

ans =

    0.1879

Ëæºó£¬ÎÒ×öÁ˽á¹û¼ìÑ飬µ÷ÓÃÌÝÐλý·Ö¹«Ê½£º

>> x=linspace(0,pi,100);
>> y=sin(x).*exp(-1.677*0.5*0.0305*180*180/pi/pi*(x-77*pi*(1/180)).^2);
>>  trapz(x,y)

ans =

    0.1879

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