Turning off auto-grouping of lines into lineseries

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David Goldsmith
David Goldsmith 2011-3-16
Hi! I've painfully stumbled across the following very baffling and infuriating "feature": it would appear that upon adding a fifth line object to a single axis, MATLAB unilaterally and without user notification groups up all existing and subsequent lines on that axis into a lineseries, which then prevents the brush on command from providing those lines with the BrushData property! To whit: I have an axis w/ two lines on which brushing and brush linking was working fine. I added a bunch more lines and suddenly a BrushEnd event handler I have returns the error "??? Error using ==> set There is no 'BrushData' property in the 'lineseries' class." Several hours and much hair wringing later, I finally try adding just one more line at a time: add one more line and it works fine. Add another line, works fine. Add one more line and "??? Error using ==> set There is no 'BrushData' property in the 'lineseries' class." CAN IT REALLY BE THAT AFTER ONLY FOUR LINES MATLAB UNILATERALLY AND WITHOUT USER NOTIFICATION GROUPS UP LINES INTO A LINESERIES OBJECT, WHICH THEN PREVENTS BRUSH ON FROM BEING ABLE TO PROVIDE THEM WITH THE BRUSHDATA PROPERTY!!?? AAARRGGGHH!!?? HOW DO I TURN THIS CRAZY THING OFF (or at least raise the limit at which it operates)?

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回答（3 个）

Walter Roberson
Walter Roberson 2011-3-16
Lines are not autogrouped into lineseries.
I happened to find your discussion in a different thread and answered there first. See here
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David Goldsmith
David Goldsmith 2011-3-16
Can you explain the phenomenon I'm observing, namely that up to a certain number of lineseries (I'm always using plot) added to an axis, brush on adds the BrushData property to them, but above that number, it doesn't?
Walter Roberson
Walter Roberson 2011-3-16
I've never used BrushData, and at the moment I don't have a (useable) graphic connection to my server that I could experiment with, sorry.

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Matt Fig
Matt Fig 2011-3-16
I am a little confused. All of the objects returned by the PLOT function are lineseries objects. Can you give an example FOR loop which shows the error? Something like:
for ii = 1:5
L(ii) = plot(1:ii);
set(L(ii),....)
end
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David Goldsmith
David Goldsmith 2011-3-16
I'll try (I have a few more things I've thought of to try; if they don't work, I'll try to generate a "minimal reproducer.")

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David Goldsmith
David Goldsmith 2011-3-16
It appears to be an undocumented (or at least I can't find it documented) feature of brushing, to whit:
x=-1:0.1:1;
y=x'*x;
figure
plot(x,y)
brush on
brushlines=findobj(gcf,'-property','BrushData');
length(brushlines)
ans =
20
hold
Current plot held
brush off
brushlines=findobj(gcf,'-property','BrushData');
length(brushlines)
ans =
20
% ??????????????????
plot(y,x)
brush on
brushlines=findobj(gcf,'-property','BrushData');
length(brushlines)
ans =
20
lines=findobj(gcf,'Type','line');
length(lines)
ans =
42
% Maybe it depends on when one turns brushing on?
% Let's plot(x,y) and plot (y,x) then turn brushing on:
clf
% make sure I haven't inadvertently corrupted my data
size(x), size(y)
ans =
1 21
ans =
21 21
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David Goldsmith
David Goldsmith 2011-3-16
Sorry, my browser's acting up on me:
plot(x,y)
hold
Current plot held
plot(y,x)
brush on
lines=findobj(gcf,'Type','line');
length(lines)
ans =
42
brushlines=findobj(gcf,'-property','BrushData');
length(brushlines)
ans =
0
% !!!!! Even I wasn't expecting that: before when I did it I got 20
Clearly I don't understand this brushing w/ multiple lines very well, but just as clearly, IMO, its behavior is very unintuitive!
In any event, I solved my problem at hand: the extra functions I needed to plot were constant functions, so naively, I was doing plot(vector, scalar), which was generating a new line object for each point! I switched to plot(vector, constant-valued vector) so each new function generated only one line object and this kept the total down sufficiently that brush on is working again. Nevertheless, I'm quite (re-)disillusioned...

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