selective hold on plot

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,

[Adam]

Just keep the handles to each plot and delete them as appropriate yourself when conditions define that they should be removed.

Answer 1

[Star Strider]

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.

[Abid Mehmood]

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.

Answer 2

[Steven Lord]

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.