selective hold on plot

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Abid Mehmood
Abid Mehmood 2019-3-1
回答： Steven Lord 2019-3-4
Hi,
I am doing lot of plots on a single figure and i want to hold on the selective plots and NOT all of plots. With MATLAB hold 'on' , it will make hold on all or none. Any work around?
Thanks,
  1 个评论
Adam
Adam 2019-3-4
Just keep the handles to each plot and delete them as appropriate yourself when conditions define that they should be removed.

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回答（2 个）

Star Strider
Star Strider 2019-3-1
It depends on what you want to do, of course.
One option is to simply put a condition on the hold call:
for k = 1:4
subplot(2,2,k)
plot(rand(1,10), rand(1,10), 'pb')
if rem(k,2) == 1
hold on
end
plot(rand(1,10)+1, rand(1,10)+1, 'pg')
hold off
end
I assume you are doing subplot calls or something similar.
  1 个评论
Abid Mehmood
Abid Mehmood 2019-3-4
I am working on the single plot with multiple curves e.g. single x-y plane with curves y1, y2, y3, y4 ... etc. All these plots are constantly updating and when a certain condition for y1 meets i want to "hold on" to y1. but when i do this it just hold on to everything. I know if i have multiple subplot then i can apply "hold on" on axes, but i don't have subplots. I tried to put all these curves on overlapping different axes so when i "hold on" one axes for let's say y1 and it shouldn't affect y2 and so forth. But that doesn't seems to work.

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Steven Lord
Steven Lord 2019-3-4
What do you mean when you say you want to '"hold on" to y1'? Do you want to do something like a zero order hold on the data? Or do you just want to skip the updating step for that particular curve?
Perhaps using animatedline objects would work. If a condition is met, just stop calling addpoints for that particular animatedline while the condition is satisfied. For example, adapting the example from the animatedline help text:
numpoints = 100000;
x = linspace(0,4*pi,numpoints);
y = sin(x);
figure
h = animatedline;
axis([0,4*pi,-1,1])
for k = 1:numpoints
% Skip y coordinates outside [-0.5, 0.5]
if abs(y(k)) <= 0.5
addpoints(h,x(k),y(k))
end
drawnow update
end
If you wanted the curve to continue drawing straight across the lines y = 0.5 and y = -0.5, you could use min and max to saturate the data to those bounds.

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