Why is my graph stopping at 10?

Question

Krish Desai 2016-2-16

0
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https://ww2.mathworks.cn/matlabcentral/answers/268309-why-is-my-graph-stopping-at-10

评论： KSSV 2016-2-16

So I'm graphing the following (note: I'm also graphing a direction field) and when I plot it the graph stops when x=10. Any suggestions?

fishfun = @(y) (1.2*y.^2)/1+y.^2;
  y=linspace(0,10,200);
  %(1.2*y.^2)./(1+y.^2); %we generated TWO vectors 1.2y^2 and 1+y^2.  To get
                        %the quotient, we need to divide COMPONENT WISE.
  plot(y,(.65*y)-(0.65*y.^2/10.5));
  title('Graph of Rainbow Trout')
  ylabel('Amount of fish (hundreds)')
  xlabel('Time (days)')
  hold on
  f= @ (t,y) (.65*y)-(0.65*y.^2/10.5)-(((1.2*(y^2))/(1+(y^2))));
  dirfield(f,0:1:30, 0:.05:2)
  title 'Direction Field of Rainbow Trout'