1、Gamma函数:
Gamma函数matlab代码:
x=0:0.5:5
syms t y=int(t.^(x-1)*exp(-t),0,inf) y=double(y) plot(x,y,'r-o','linewidth',1)
图像如下:
2、lgΓ(x)函数
matlab代码:
x=0:0.1:5
syms t y=int(t.^(x-1)*exp(-t),0,inf) y=log10(double(y)) plot(x,y,'r-o','linewidth',1)
图形:
Gamma分布:
matlab代码:
a=1,b=0.5 syms c d=int(c^(a-1)*exp(-c),0,inf) t=0:0.1:20 g=b.^a*(t.^(a-1)).*exp(-b*t)/d g=double(g) plot(t,g,'r-.','linewidth',1)
图形:
matlab代码:
t=0:0.1:20 syms c a=1,b=0.5 d=int(c^(a-1)*exp(-c),0,inf) g=b.^a*(t.^(a-1)).*exp(-b*t)/d g=double(g) plot(t,g,'r-.','linewidth',1) hold on; a=2,b=0.5 d=int(c^(a-1)*exp(-c),0,inf) g=b.^a*(t.^(a-1)).*exp(-b*t)/d g=double(g) plot(t,g,'g-.','linewidth',1) hold on a=3,b=0.5 d=int(c^(a-1)*exp(-c),0,inf) g=b.^a*(t.^(a-1)).*exp(-b*t)/d g=double(g) plot(t,g,'b-.','linewidth',1) hold on a=5,b=1 d=int(c^(a-1)*exp(-c),0,inf) g=b.^a*(t.^(a-1)).*exp(-b*t)/d g=double(g) plot(t,g,'c-.','linewidth',1) hold on a=9,b=2 d=int(c^(a-1)*exp(-c),0,inf) g=b.^a*(t.^(a-1)).*exp(-b*t)/d g=double(g) plot(t,g,'m-.','linewidth',1) hold on; legend('a=1,b=0.5','a=2,b=0.5','a=3,b=0.5','a=5,b=1','a=9,b=2');
图形:
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