Specify wich values appear on a plot legend
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I'm plotting in a for loop a series of signals and additionally lines to separate segments in the plot. I want to add a Legend for each of the signal but when I add the legend it adds the lines too and Im not really sure how to take the lines out of the Legend.
My code is:
for j=1:8
figure(j)
for i=1:6
plot(f(j,:,i),cxy(j,:,i))
hold on
xlim([0 45])
line ([4,4],[0, 1],'Color','red','LineStyle','--') % Cada linea separa las bandas de energia para ver la coherencia entre bandas
line ([8,8],[0, 1],'Color','red','LineStyle','--')
line ([13,13],[0, 1],'Color','red','LineStyle','--')
line ([30,30],[0, 1],'Color','red','LineStyle','--')
% Here the legend should appear only for the plots not for the lines
legend('Signal 1','Signal 2','Signal 3','Signal 4','Signal 5', 'Signal 6')
end
end
My result is the plot I attach. I've searched arround how to solve this but nothing is working.
Thanks in advanced for the help and sorry for the basic question.
2 个评论
KALYAN ACHARJYA
2018-8-29
"how to take the lines out of the Legend?"
Which lines are you talking?
Are these lines within legend dashed colors lines?
Juan Sanchez
2018-8-29
编辑：Juan Sanchez
2018-8-29
采纳的回答
Use the handles of the lines you wish to add legends to...
nFig=8; % set the numbers via variables
nLin=6; % instead of using "magic" numbers...
hL=gobjects(nFig,nLin); % preallocate for the line handles
for j=1:nFig
figure(j)
for i=1:nLin
hL(j,i)=plot(f(j,:,i),cxy(j,:,i)); % plot the line, save the line handle for it...
hold on
xlim([0 45])
line ([4,4],[0, 1],'Color','red','LineStyle','--') % Cada linea separa las bandas de energia para ver la coherencia entre bandas
line ([8,8],[0, 1],'Color','red','LineStyle','--')
line ([13,13],[0, 1],'Color','red','LineStyle','--')
line ([30,30],[0, 1],'Color','red','LineStyle','--')
% Here the legend should appear only for the plots not for the lines
end
% Add legend after the lines are drawn using the handles of those wanted to show only
legend(hL(j,:),{'Signal 1','Signal 2','Signal 3','Signal 4','Signal 5', 'Signal 6'})
end
One could also build the legend text dynamically to match the loop indices instead of hardcoding...
2 个评论
Juan Sanchez
2018-8-29
编辑：Juan Sanchez
2018-8-29
You're right, got the loop indices reversed...I'll make the correction, thanks.
If don't code with "magic numbers" as general rule it makes modifying/using code for other purposes much easier or makes the given code useful if the present data sizes change for any reason.
I wasn't really suggesting to just move the constants to explicit variables; I just used that as a shortcut/prompt, what I really meant was to do something like
[nFig,nLin]=size(cxy);
THEN, if you get a dataset for some reason that isn't exactly 8x6 you still don't have to do anything but run the code to process it.
It's just a good habit to develop.
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