How to fix the legends for these 3 cases?

Question

Vanessa Phung 2017-3-27

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/332098-how-to-fix-the-legends-for-these-3-cases

评论： Vanessa Phung 2017-3-27

test.m

I've plotted 3 subplots to test out how is the legend arrange. Multiple lineplot for different condition in each subplot. I want to label the respective lines correctly, however, I failed. First subplot has label respectively but I want to rename. Second and third subplots can be renamed, but cannot represent each line colour.

Please give me some suggestion for the correction of my code (only the plotting figures part). Thank you.

%----Physical constant---------% m = 9.1e-31; % electron mass [kg] c= 3e8; % speed of light [m/s] eps = 8.854e-12;% permittivity [F/m] e = 1.6e-19; % charge [Coulomb] h_bar = 6.626e-34 /2/pi; % reduced Planck constant_bar [m^2 kg/s]

%----Calculating K for different ro and different energy----% E_beam = linspace(10e6,100e6,10); %Electron beam energy gamma = E_beam./0.511e6; gamma'; M=gamma'*ones(1,10)

n =linspace(1e24,1e25,10); %density n'; N=n'*ones(1, 10)

P =sqrt( M.*(N/1e6))

ro = linspace(1e-6, 5e-6,5); for i = 1:length (ro) K(:,:,i)= 1.33E-10.*P.*(ro(i)/1e-6) end

%----Plasma frequency----% plasma_freq=sqrt((n(1,:)*(1.6e-19)^2)/(9.1e-31*8.85e-12)); lambda_plasma = 2*pi*c./plasma_freq; % plasma wavelength [m] wavenum = 2*pi./lambda_plasma; % [m-1]

%----Betatron parameter----% w_beta = plasma_freq./sqrt(2*gamma); % fundamental beta freq [s-1] % lambda_beta = 2*pi*c/w_beta; % betatron period [m] lambda_beta_1um = (2*pi*gamma(1,:)*ro(1,1))./K(1,:,1); lambda_rad_1um = lambda_beta_1um./(2.*gamma(1,:).*gamma(1,:)); % fundamental wavelength

%----Plotting figures----% figure (1) subplot(3,1,1) AX= plot(gamma(1,:),K(:,:,1),'r',gamma(1,:),K(:,:,2),'g',gamma(1,:),K(:,:,3),'k',gamma(1,:),K(:,:,4),'b',gamma(1,:),K(:,:,5),'c','LineWidth',2); title ('legend is correct for each but cannot rename each of them'); ylabel('K'); xlabel('gamma'); ff = findobj('Color','r'); gg = findobj('Color','g'); hh = findobj('Color','k'); tt = findobj('Color','b'); yy = findobj('Color','c'); v = [ff(1) gg(1) hh(1) tt(1) yy(1)]; legend(v, 'Location','northeastoutside');

subplot(3,1,2) h1 = 'rgkbc'; h2=('12345'); for iter=1:length(ro) ax=plot(N(:,i),K(:,:,iter),'Color',h1(iter),'LineWidth',2);hold on h=legend ([ax], {h2(1) h2(2) h2(3) h2(4) h2(5)},'Location','northeastoutside');hold on title ('only showing last iteration value as legend') end ylabel('K'); xlabel('Density,n [m^{-3}]');

subplot(3,1,3) format short e color = 'rgkbc'; for i=1:length(ro) plot(N(:,1),K(:,:,i),'Color',color(i),'Linewidth', 2); hold on; entries(i) = { sprintf('ro = %i ',ro(i)) }; end legend('String',entries,'Location','northeastoutside');% Create legend using the 'entries' strings ylabel('K'); xlabel('Density,n [m^{-3}]'); title('only show one colour for different label');

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Answer 1

KSSV 2017-3-27

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/332098-how-to-fix-the-legends-for-these-3-cases#answer_260508

在 MATLAB Online 中打开

clear all;
close all;
clc;
%----Physical constant---------%
m = 9.1e-31; % electron mass [kg]
c= 3e8; % speed of light [m/s]
eps = 8.854e-12;% permittivity [F/m]
e = 1.6e-19; % charge [Coulomb]
h_bar = 6.626e-34 /2/pi; % reduced Planck constant_bar [m^2 kg/s]
%----Calculating K for different ro and different energy----%
E_beam = linspace(10e6,100e6,10); %Electron beam energy
gamma = E_beam./0.511e6;
gamma';
M=gamma'*ones(1,10)
n =linspace(1e24,1e25,10); %density
n';
N=n'*ones(1, 10)
P =sqrt( M.*(N/1e6))
ro = linspace(1e-6, 5e-6,5);
for i = 1:length (ro)
    K(:,:,i)= 1.33E-10.*P.*(ro(i)/1e-6)
end
%----Plasma frequency----%
plasma_freq=sqrt((n(1,:)*(1.6e-19)^2)/(9.1e-31*8.85e-12));
lambda_plasma = 2*pi*c./plasma_freq; % plasma wavelength [m]
wavenum = 2*pi./lambda_plasma; % [m-1]
%----Betatron parameter----%
w_beta = plasma_freq./sqrt(2*gamma);  % fundamental beta freq [s-1]
% lambda_beta = 2*pi*c/w_beta; % betatron period [m]
lambda_beta_1um = (2*pi*gamma(1,:)*ro(1,1))./K(1,:,1);
lambda_rad_1um = lambda_beta_1um./(2.*gamma(1,:).*gamma(1,:)); % fundamental wavelength
%----Plotting figures----%
figure (1)
subplot(3,1,1)
AX= plot(gamma(1,:),K(:,:,1),'r',gamma(1,:),K(:,:,2),'g',gamma(1,:),K(:,:,3),'k',gamma(1,:),K(:,:,4),'b',gamma(1,:),K(:,:,5),'c','LineWidth',2);
title ('legend is correct for each but cannot rename each of them');
ylabel('K');
xlabel('gamma');
ff = findobj('Color','r');
gg = findobj('Color','g');
hh = findobj('Color','k');
tt = findobj('Color','b');
yy = findobj('Color','c');
v = [ff(1) gg(1) hh(1) tt(1) yy(1)];
str = {'a' 'b' 'c' 'd' 'e'} ;
legend(v, str1,'Location','northeastoutside');
subplot(3,1,2)