why my graph is not showing any thing ?

Question

suketu vaidya 2020-11-21

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/655218-why-my-graph-is-not-showing-any-thing

评论： suketu vaidya 2020-11-21

function Lab02
h = 0.001;
  p=1;
x=0:p:0.5;
    t = 0:h:0.5;
     y = [0];
     for i = 1:length(p)-1
         k1=f(x(i),y(i));
         k2=f(x(i)+1/2*h,y(i)+1/2*k1*h);
         k3=f(x(i)+h,y(i)-k1*h+2*k2*h);
         y(i+1)=y(i)+h/6*(1*k1+4*k2+1*k3);
     end
    plot(x,y);
    hold on
     end
     %analitycal solution 
    function dy=f(x,y)
syms y(x);
ode=(diff(y(x),x,2))+10*y(x) +sin(100*pi*x)==0;
ySol(x) = dsolve(ode);
c1=1;
c2=1;
dy=c2*sin(3.1623*x)+c1*cos(3.1623*x)+(sin(100*pi*x))/((10000*pi*pi)-10);
end

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Answer 1

KSSV 2020-11-21

1
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/655218-why-my-graph-is-not-showing-any-thing#answer_551463

编辑：KSSV 2020-11-21

在 MATLAB Online 中打开

Check this line:

p = 1 ; 
x=0:p:0.5;

The above shpuld be repalced with proper value p. Now it will create only one value i.e. x = 0. You should repalce this line with the appropriate stpe size p.