Drawing a line through the peak of the plot

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Ismita
Ismita 2023-1-21
评论： Paul 2023-1-21
I have a plot as follows. How can I add vertical lines through the peak points (total 3 lines here) in the plot ?
Code:
I have written the code as:
"clear all;
m = 4.48e-26; % mass of Nitrogen molecule
k = 1.38e-23; % Boltzmann Constant
p = 0:2800;
ind = 1;
for T = 300:500:1500;
% constant computation
c1 = 4*pi*(m/(2*pi*k*T))^(3/2);
c2 = m/(2*k*T);
c3 = 3*m*k*T;
u(ind,:) = c1*(p.^2.*exp(-(c2*p.^2)));
%u2(ind,:) = c1*c3*exp(-(3/2))
ind = ind+1;
end
figure(1)
plot(p,u)
xlabel('P')
ylabel('probability')
"

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回答（1 个）

Paul
Paul 2023-1-21
Ran in:
m = 4.48e-26; % mass of Nitrogen molecule
k = 1.38e-23; % Boltzmann Constant
p = 0:2800;
ind = 1;
for T = 300:500:1500;
% constant computation
c1 = 4*pi*(m/(2*pi*k*T))^(3/2);
c2 = m/(2*k*T);
c3 = 3*m*k*T;
u(ind,:) = c1*(p.^2.*exp(-(c2*p.^2)));
%u2(ind,:) = c1*c3*exp(-(3/2))
ind = ind+1;
end
figure(1)
plot(p,u)
xlabel('P')
ylabel('probability')
Find the maximum points and their corresponding indices
[maxu,index] = max(u,[],2);
Plot vertical lines at p for each index. Use the options for xline to customize color, etc.
xline(p(index(1)));
xline(p(index(2)));
xline(p(index(3)));
  2 个评论
Ismita
Ismita 2023-1-21
Thank you so much!
Could you please explain the line
"[maxu,index] = max(u,[],2);" specially max(u,[],2) meaning. I am a new user of Matlab. Thanks again.
Paul
Paul 2023-1-21
Check out the doc page for max. Freel free to come back if you still have questions.

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