怎么用 matlab画出这个公式的图，有图例，求编程过程
答案:2 悬赏:10 手机版
解决时间 2021-03-17 23:49
- 提问者网友：書生途
- 2021-03-17 18:48
怎么用 matlab画出这个公式的图，有图例，求编程过程
最佳答案
- 五星知识达人网友：煞尾
- 2021-03-17 19:20
写了个M file，运行得到你的图像，不过有点小小的bug：clear
figure1=figure('Color',[1 1 1]);
syms x;
k=0:0.2:10;
N=zeros(1,length(k));
for i=2:length(k)
y=k(i)/2*int(1/((x+k(i)^2)^(3/2)*(x+1)),x,0,inf);
N(i-1)=vpa(y,10);
end
plot(k,N,'r.'),grid on 运行结果：不过命令窗口出现了以下东西：Warning: Explicit integral could not be found.
Warning: Explicit integral could not be found.
Warning: Explicit integral could not be found.
Warning: Explicit integral could not be found.
Warning: Explicit integral could not be found.
Warning: Explicit integral could not be found.
Warning: Explicit integral could not be found.
Warning: Explicit integral could not be found.
Warning: Explicit integral could not be found.
Warning: Explicit integral could not be found. ……
figure1=figure('Color',[1 1 1]);
syms x;
k=0:0.2:10;
N=zeros(1,length(k));
for i=2:length(k)
y=k(i)/2*int(1/((x+k(i)^2)^(3/2)*(x+1)),x,0,inf);
N(i-1)=vpa(y,10);
end
plot(k,N,'r.'),grid on 运行结果：不过命令窗口出现了以下东西：Warning: Explicit integral could not be found.
Warning: Explicit integral could not be found.
Warning: Explicit integral could not be found.
Warning: Explicit integral could not be found.
Warning: Explicit integral could not be found.
Warning: Explicit integral could not be found.
Warning: Explicit integral could not be found.
Warning: Explicit integral could not be found.
Warning: Explicit integral could not be found.
Warning: Explicit integral could not be found. ……
全部回答
- 1楼网友：北城痞子
- 2021-03-17 20:51
syms x k;
n_x=k/2*int(1/sqrt(x+k^2)^3/(x+1),x,0,inf);
kk=linspace(.1,10,50);
plot(kk,subs(n_x,k,kk))
ylim([0,.7])
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