Legend in plot using forloop

Question

Sam 2020-3-27

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/513335-legend-in-plot-using-forloop

回答： Peng Li 2020-3-27

Hello,

I am trying to plot the legend of 3 things here: temperature data (continuous blue line), the starting point of a sit period (green asterix), end point of a sit period (red asterix). The forloop runs over 2 specified values (4 and 34).

[row2,col2] = find(start_sit_periods);
for i = col2;
t = linspace(0,(((length(temp_i1)/fs)/60)/60),length(temp_i1)); 
figure(1)
ee = linspace(0,((length(x_i1)/fs)/60),length(x_i1));
subplot 411
plot(ee,temp_i1)
xlabel('Time (minutes)')
ylabel('Temperature (°C)')
hold on
plot(ee(start_sit_periods(1,i)),temp_i1(start_sit_periods(1,i)),'*g')
plot(ee(end_sit_periods(1,i)),temp_i1(end_sit_periods(1,i)),'*r')
legend('Leg temperature','Start sit','End sit')
subplot 412
plot(ee,abs(x_i1))
xlabel('Time (minutes)')
ylabel('Acceleration (m/s²)')
subplot 413
plot(ee,abs(y_i1))
xlabel('Time (minutes)')
ylabel('Acceleration (m/s²)')
subplot 414
plot(ee,abs(z_i1))
xlabel('Time (minutes)')
ylabel('Acceleration (m/s²)')
end

I've tried some

things, but the legend stays wrongs.

Can anyone help?

Thanks!

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darova 2020-3-27

Did you try put several legend after each subplot?

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Answer 1

Peng Li 2020-3-27

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/513335-legend-in-plot-using-forloop#answer_422350

在 MATLAB Online 中打开

Not quite sure what you meant by "the legend stays wrong", but please try this if my guess is correct.

figure(1)
ee = linspace(0,((length(x_i1)/fs)/60),length(x_i1));
subplot 411
p1 = plot(ee,temp_i1)
xlabel('Time (minutes)')
ylabel('Temperature (°C)')
hold on
p2 = plot(ee(start_sit_periods(1,i)),temp_i1(start_sit_periods(1,i)),'*g')
p3 = plot(ee(end_sit_periods(1,i)),temp_i1(end_sit_periods(1,i)),'*r')
legend([p1 p2 p3], {'Leg temperature','Start sit','End sit'})