Legend for multiple plots varying parameters

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Pleas, how do I make my legend to match with my data? I have attached the figure. I want the legend data1 to corresponds to xi = -0.06, t=0, data2 to corresponds to xi=-0.05, t=0, data3: xi = -0.06, t=25, data4: xi = -0.05, t=25 and so on ..
% matlab and maple for theta plot for different xi values
figure
subplot(2,1,1)
hold on
for ixi = 1:2
if ixi == 1
plot(z, squeeze(THETA(ixi,it,:)), 'c', z2, thetasolxi,'r');
else
plot(z, squeeze(THETA(ixi,it,:)),'g--', z2, thetasolxi2, 'b--');
end
xlabel('z (\mu m)')
ylabel('\theta(z,t)(rad)')
title('Comparison of \theta(z,t) plot for \xi for maple and matlab' )
end
legend('show')
% matlab and maple for v plot for different xi values
subplot(2,1,2)
hold on
for ixi = 1:2
if ixi == 1
plot(z, squeeze(V(ixi,it,:)), 'c', z2, vsolxi2,'r--');
else
plot(z, squeeze(V(ixi,it,:)),'g', z2, vsolxi, 'b--');
end
xlabel('z (\mu m)')
ylabel('v(z,t)(m/s)')
title('Comparison of v(z,t) plot for \xi for maple and matlab' )
end
legend('show')
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Accepted Answer

Walter Roberson
Walter Roberson on 25 Sep 2022
% matlab and maple for theta plot for different xi values
figure
subplot(2,1,1)
hold on
for ixi = 1:2
xi_part = "xi = " + Xis(ixi);
t_part = ", t = " + Times(it);
dn = xi_part + t_part;
if ixi == 1
plot(z, squeeze(THETA(ixi,it,:)), 'c', z2, thetasolxi,'r', 'DisplayName', dn);
else
plot(z, squeeze(THETA(ixi,it,:)),'g--', z2, thetasolxi2, 'b--', 'DisplayName', dn);
end
xlabel('z (\mu m)')
ylabel('\theta(z,t)(rad)')
title('Comparison of \theta(z,t) plot for \xi for maple and matlab' )
end
legend('show')
% matlab and maple for v plot for different xi values
subplot(2,1,2)
hold on
for ixi = 1:2
xi_part = "xi = " + Xis(ixi);
t_part = ", t = " + Times(it);
dn = xi_part + t_part;
if ixi == 1
plot(z, squeeze(V(ixi,it,:)), 'c', z2, vsolxi2,'r--', 'DisplayName', dn);
else
plot(z, squeeze(V(ixi,it,:)),'g', z2, vsolxi, 'b--', 'DisplayName', dn);
end
xlabel('z (\mu m)')
ylabel('v(z,t)(m/s)')
title('Comparison of v(z,t) plot for \xi for maple and matlab' )
end
legend('show')
  5 Comments
University Glasgow
University Glasgow on 25 Sep 2022
Thank you , after the defining the it, Is working now.

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