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nono2009(½ð±Ò+0,VIP+0):лл²ÎÓ롣д³öÀ´ºó¼ÓBB¡£ 9-23 06:07
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nono2009(½ð±Ò+3,VIP+0):лл½»Á÷£¡»¶Ó­³£À´¡£ 9-23 13:11
function test
clear all
clc
format long
global k

kspan=-20:0.5:20;
y=zeros(length(kspan),1);
for i=1:length(kspan)
    k=kspan(i);
    y(i)=quadgk(@func,0,inf);
end
figure(1)
plot(kspan,y,'r*-')
xlabel('k')
ylabel('y=\int_0^{\infty}x^{0.5}/(1+e^{x-k})dx')

function f=func(x)
global k
f=x.^0.5./(1+exp(x-k));
3Â¥2009-09-23 13:00:11
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hitzhang

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