Create a specific legend in Matlab

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Wissem-Eddine Khatla
评论： Cris LaPierre 2021-4-12
Hello everyone,
I have put together some experimental data that I have plotted in a rather rudimentary way using Matlab.
Here is the code in question:
%% TEST pince de 2.5 cm
y = [7.58 7.12 6.55 6.20 5.60 5.45 5.18 5.02 4.96 4.75 4.55 4.41]; % Longueur d'onde
x = [0.0755 0.0943 0.1022 0.1030 0.1187 0.1297 0.1430 0.1506 0.1634 0.1808 0.1898 0.1930]*1.5625; % Fréquence de rotation
z = [9 10 11 12 13 14 15 16 17 18 19 20]; % Nombre de volts
h = zeros(6,1);
h(1) = plot(x,y,'b')
h(2) = plot(x,y,'-o')
ylabel('\lambda (cm)')
xlabel('\Omega (Hz)')
hold on
y = [7.39 7.12 6.44 6.04 5.63 5.40 5.10 4.96 4.80 4.50 4.33]; % Longueur d'onde
x = [0.0668 0.0755 0.0943 0.1022 0.1086 0.1254 0.1349 0.1460 0.1573 0.1660 0.1828]*1.5625; % Fréquence de rotation
z = [8 9 10 11 12 13 14 15 16 17 18]; % Nombre de volts
h(3) = plot(x,y,'k')
h(5) = plot(x,y,'-o')
ylabel('\lambda (cm)')
xlabel('\Omega (Hz)')
y = [7.39 6.58 5.92 5.74 5.27 5.04 4.83 4.73 4.28 4.23]; % Longueur d'onde
x = [0.0605 0.0777 0.0856 0.0938 0.1082 0.1193 0.1300 0.1466 0.1506 0.1680]*1.5625; % Fréquence de rotation
z = [8 9 10 11 12 13 14 15 16 17]; % Nombre de volts
h(4) = plot(x,y,'r')
h(6) = plot(x,y,'-o')
ylabel('\lambda (cm)')
xlabel('\Omega R^{2}')
title('Mesure ruban rose largeur 1.5 cm avec une pince de 2.5 cm de largeur')
legend(h,'7 cm','pince de 2.5 cm','10.5 cm','12.5 cm');
grid on
hold off
%%
What I am trying to do in practice: you will note that there are 3 sets of (x,y) which each correspond to an experiment carried out for a precise experimental length. For each pair of plots (x,y) it is essential to associate a colour that allows the length in question to be distinguished in the legend (so each pair (x,y) would correspond to a colour which itself corresponds to a given length). But in addition: the three (x,y) pairs were made for another characteristic length which this time is common to them, so to notify this I wanted to draw each curve with a distinct colour but with a unique marker (typically a circle for the three pairs).
Unfortunately, I can't translate what I want into a clean and understandable legend so I'm asking for your help if possible,
I thank you in advance for your assistance--

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回答（1 个）

Cris LaPierre
Cris LaPierre 2021-4-11
Ran in:
I don't follow your description completely. What should the actual legend be? Should there be 6 items in your legend? Three using lines of different color, and 3 with diferent line colors + a circle marker?
Here's what does that.
%% TEST pince de 2.5 cm
y = [7.58 7.12 6.55 6.20 5.60 5.45 5.18 5.02 4.96 4.75 4.55 4.41]; % Longueur d'onde
x = [0.0755 0.0943 0.1022 0.1030 0.1187 0.1297 0.1430 0.1506 0.1634 0.1808 0.1898 0.1930]*1.5625; % Fréquence de rotation
plot(x,y,'b','DisplayName','Name1')
hold on
plot(x,y,'-o','DisplayName','Name2')
y = [7.39 7.12 6.44 6.04 5.63 5.40 5.10 4.96 4.80 4.50 4.33]; % Longueur d'onde
x = [0.0668 0.0755 0.0943 0.1022 0.1086 0.1254 0.1349 0.1460 0.1573 0.1660 0.1828]*1.5625; % Fréquence de rotation
plot(x,y,'k','DisplayName','Name3')
plot(x,y,'-o','DisplayName','Name4')
y = [7.39 6.58 5.92 5.74 5.27 5.04 4.83 4.73 4.28 4.23]; % Longueur d'onde
x = [0.0605 0.0777 0.0856 0.0938 0.1082 0.1193 0.1300 0.1466 0.1506 0.1680]*1.5625; % Fréquence de rotation
plot(x,y,'r','DisplayName','Name5')
plot(x,y,'-o','DisplayName','Name6');
hold off
grid on
ylabel('\lambda (cm)')
xlabel('\Omega (Hz)')
title('Mesure ruban rose largeur 1.5 cm avec une pince de 2.5 cm de largeur')
legend('NumColumns',3);
Since each pair of plots contains the same data, you lines exactly overlap.
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Wissem-Eddine Khatla
Wissem-Eddine Khatla 2021-4-12
I am very sorry : I thaught that I have sent my message which isn't the case...
I have tried this one but I don't understand why it doesn't work :
%% TEST pince de 2.5 cm
y = [7.58 7.12 6.55 6.20 5.60 5.45 5.18 5.02 4.96 4.75 4.55 4.41]; % Longueur d'onde
x = [0.0755 0.0943 0.1022 0.1030 0.1187 0.1297 0.1430 0.1506 0.1634 0.1808 0.1898 0.1930]*1.5625; % Fréquence de rotation
z = [9 10 11 12 13 14 15 16 17 18 19 20]; % Nombre de volts
h = zeros(3,1);
plot(x,y,'b','DisplayName','7 cm')
h(1) = plot(x,y,'-o')
ylabel('\lambda (cm)')
xlabel('\Omega (Hz)')
hold on
y = [7.39 7.12 6.44 6.04 5.63 5.40 5.10 4.96 4.80 4.50 4.33]; % Longueur d'onde
x = [0.0668 0.0755 0.0943 0.1022 0.1086 0.1254 0.1349 0.1460 0.1573 0.1660 0.1828]*1.5625; % Fréquence de rotation
z = [8 9 10 11 12 13 14 15 16 17 18]; % Nombre de volts
plot(x,y,'k','DisplayName','10.5 cm')
h(2) = plot(x,y,'-o')
ylabel('\lambda (cm)')
xlabel('\Omega (Hz)')
y = [7.39 6.58 5.92 5.74 5.27 5.04 4.83 4.73 4.28 4.23]; % Longueur d'onde
x = [0.0605 0.0777 0.0856 0.0938 0.1082 0.1193 0.1300 0.1466 0.1506 0.1680]*1.5625; % Fréquence de rotation
z = [8 9 10 11 12 13 14 15 16 17]; % Nombre de volts
plot(x,y,'r','DisplayName','12.5 cm')
h(3) = plot(x,y,'-o')
ylabel('\lambda (cm)')
xlabel('\Omega R^{2}')
title('Mesure ruban rose largeur 1.5 cm avec une pince de 2.5 cm de largeur')
legend
legend(h,'pince de 2.5 cm','pince de 2.5 cm','pince de 2.5 cm');
grid on
hold off
%%
But you have already done it so thank you very much for your help. But could you tell me why my code doesn't do the job please ?
Thank you again.
Cris LaPierre
Cris LaPierre 2021-4-12
Please explain what you mean by "doesn't work". Be specific about what you expected, and what it is doing instead.

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