how to mark a given point on the graph?

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SAHIL SAHOO 2022-10-9

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1820630-how-to-mark-a-given-point-on-the-graph

评论： SAHIL SAHOO 2022-10-10

在 MATLAB Online 中打开

ti = 0;

tf = 1E-3;

tspan=[ti tf];

KC = 4E-3;

y0= [ (10e-6)*rand(2,1); ((-3.14).*rand(1,1) + (3.14).*rand(1,1));

(10e-6)*rand(2,1); ((-3.14).*rand(1,1) + (3.14).*rand(1,1));

((-3.14).*rand(5,1) + (3.14).*rand(5,1))];

yita_mn = [

0 1 0 0 1;

1 0 1 0 0;

0 1 0 1 0;

0 0 1 0 1;

1 0 0 1 0;

]*(KC);

N = 5;

t = 1E-3;

o = sort(10e2*rand(1,10),'ascend');

[T,Y]= ode45(@(t,y) rate_eq(t,y,yita_mn,N,o),tspan,y0);

figure(1)

plot(Y(:,1),(Y(:,2)),'linewidth',2);

% i want to mark in y axis 3.57832 and in x axis 0.092

xlabel("Gain")

ylabel("Amplitude")

grid on

set(gca,'fontname','times New Roman','fontsize',18,'linewidth',1.8);

function dy = rate_eq(t,y,yita_mn,N,o)

dy = zeros(4*N,1);

dGdt = zeros(N,1);

dAdt = zeros(N,1);

dOdt = zeros(N,1);

P = 1.27;

a = 0.1;

tc = 230E-6;

tp = 5.4E-9;

Gt = y(1:3:3*N-2);

At = y(2:3:3*N-1);

Ot = y(3:3:3*N-0);

k = 4E-3;

for i = 1:N

dGdt(i) = (P - Gt(i).*((abs(At(i)))^2 +1))./tc ;

dAdt(i) = (Gt(i)-a).*((At(i))./tp);

dOdt(i) = o(1,i);

for j = 1:N

dAdt(i) = dAdt(i)+yita_mn(i,j)*(1/tp)*(At(j))*cos(Ot(j)-Ot(i));

dOdt(i) = dOdt(i)+yita_mn(i,j)*(1/tp)*((At(j)/At(i)))*sin(Ot(j)-Ot(i));

end

dy(1:3:3*N-2) = dGdt;

dy(2:3:3*N-1) = dAdt;

dy(3:3:3*N-0) = dOdt;

n1 = (1:5)';

n2 = circshift(n1,-1);

n16 = n1 + 15;

n17 = circshift(n16,-1);

n20 = circshift(n16,1);

j2 = 3*(1:5)-1;

j5 = circshift(j2,-1);

j8 = circshift(j2,-2);

j19 = circshift(j2,1);

dy(n16) = o(1,n2).' - o(1,n1).' - (k./tp).*(y(j2)./y(j5)).*sin(y(n16)) - (k./tp).*(y( j5)./y(j2)).*sin(y(n16)) + (k./tp).*(y(j8)./y(j5)).*sin(y(n17)) + (k./tp).*(y(j19)./y(j2)).*sin(y(n20));

end

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dpb 2022-10-9

在 MATLAB Online 中打开

"i want to mark in y axis 3.57832 and in x axis 0.092"

That's in the edge of the dark blob where line space is so close as to be indistinguishable, but definitely in the ROI.

You swapped x,y, Star... :)

hXY=plot(0.092,3.57832,'xr');

where saved a handle to the specific point/line so can delete/recreate/modify at will more easily...

SAHIL SAHOO 2022-10-10

thanks for the help

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