Legend being occupied by background spectrogram
4 次查看(过去 30 天)
显示 更早的评论
I have code which goes like this:
clc;clear;
close all
Time=linspace(16.8,17.8,230400)';
Field=linspace(0,4,230400)';
figure('units','normalized','outerposition',[0 0 1 1])
hammng_wndw_size=4096;
window=hamming(hammng_wndw_size); %window size
noverlap=512; % the noverlaps its the no. of points for repeating the window
nfft=4096; %size of fft
fs=32; %sampling freq
[Sp,F,T,P]=spectrogram(Field,window,noverlap,nfft,fs,'yaxis');
T_forspectrogrm=T./3600+Time(1);
surf(T_forspectrogrm,F,10*log10(P),'edgecolor','none','FaceColor','interp');
axis tight;ylim([0 4]);view(0,90);
colormap(jet);
cb = colorbar(gca,'east');
cb.Position = cb.Position + [0.07 0 0 0];
cb.Label.String = '\bf log_{10}(nT^2/Hz)';
ylabel('Frequency (Hz)')
set(gca,'linewidth',1.5,'fontsize',...
12,'Layer','top');
grid off
hold on
Field4fig=Field(1:round(length(Field)/length(T)):length(Field),1);
plot(T_forspectrogrm,Field4fig,'r',...
T_forspectrogrm,Field4fig/2,'k','LineWidth',1.5)
legend({'A','B'},'FontSize',15,'Location','northwest')
ax=gca;
ax.XTickLabel=datestr(hours(ax.XTick),'HH:MM');
And whose output is like this:
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/419193/image.jpeg)
My question is:
- As you can see from the command, I have 2 legends in the program, however, in the plot only one is showing, the other is occupied by the background spectrogram. What am I doing it and how can I rectify it?
- If you click on the ‘Data Cursor’ and click on the lines, we can see that the end points of both the lines is 16.82 and 18.78. How can I modify the code to start x axis from this time in hh:mm format in such a way that there are 10 evenly placed ticks in x axis?
I am usign MATLAB2016a
0 个评论
采纳的回答
VBBV
2020-11-19
hold on
Field4fig=Field(1:round(length(Field)/length(T)):length(Field),1);
F = plot(T_forspectrogrm,Field4fig,'r',...
T_forspectrogrm,Field4fig/2,'k','LineWidth',1.5)
legend(F, {'A','B'},'FontSize',15,'Location','northwest')
Try above for plotting legend
更多回答(1 个)
KALYAN ACHARJYA
2020-11-19
编辑:KALYAN ACHARJYA
2020-11-19
Questions 1:
You have only one legened in the provided code
legend({'A','B'},'FontSize',15,'Location','northwest')
Question 2:
Clarification needed: Do you want to start the line plot from 17:00 right?
另请参阅
类别
在 Help Center 和 File Exchange 中查找有关 Legend 的更多信息
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!