Dynamic Plotting "Phantom" Line
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Dear fellow MATLAB Users,
I have created a dynamic plotting system to be used with various x and y data points and have unwanted line appearing at the start of the plotting sequence. Here is my code as it currently stands:
__________ CODE START __________
x=[0;6;2;8;4;10;6;12;8];
y=[0;2;4;6;8;10;12;14;16];
t=numel(x);
r=x(t);
nnn=y(t);
s1=subplot(1,1,1);
set(s1,'xlim',[1 numel(x)],'ylim',sort([0 r]),'nextplot','add')
p1=plot(r,nnn,'r-');
p2=plot(r,nnn,'g*');
axis([0 20 0 20])
set(gca,'ydir','rev')
for t=1:numel(x)
r=x(t);
nnn=y(t);
set(p1,'xdata',[get(p1,'xdata') r],'ydata',[get(p1,'ydata') nnn])
set(p2,'xdata',r,'ydata',nnn)
pause(.5)
end
__________ CODE END __________
Notice how there is a line extending from the origin, to the final data point. I cannot understand why this is occurring, nor what to do to remedy it. Any help that could be lent to solve this issue would be greatly appreciated.
Thank you,
~ Chris
댓글 수: 2
Jan
2011년 4월 28일
Please use the code formatting as described at the link called "Markup" on this page.
채택된 답변
Paulo Silva
2011년 4월 28일
Initialize p1 with this code
p1=plot(nan,nan,'r-');
instead of
p1=plot(r,nnn,'r-');
추가 답변 (1개)
Jan
2011년 4월 28일
You get a connection from the origin to the last data point, because your program explicitely instructs that.
x = [0;6;2;8;4;10;6;12;8];
y = [0;2;4;6;8;10;12;14;16];
t = numel(x);
r = x(t);
nnn = y(t);
s1 = axes('xlim',[0, 20],'ylim',sort([0 20]), ...
'nextplot','add', 'ydir','rev');
p1 = plot(r, nnn, 'r-');
p2 = plot(r, nnn, 'g*');
% Now [p1] is the last data point
for t = 1:numel(x)
r = x(t);
nnn = y(t);
set(p1, 'xdata',[get(p1,'xdata') r], ...
'ydata',[get(p1,'ydata') nnn])
set(p2, 'xdata',r, 'ydata',nnn)
pause(.5)
% In the first iteration the origin is added to [p1]!!!
end
I cannot guess, what you want to do instead. Perhaps you want to start your t-loop from 2 or remove the zeros from x and y.
댓글 수: 2
Jan
2011년 4월 28일
Puh, the latency is cruel for me. I've typed the answer and waited 13 minutes until it appears completely in the web interface. Therefore I did not see Paulo's answer before.
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