How do I get the plot in my for loop to retain previous plots?
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I'm trying to set up a for loop inside a function to plot my data so I can see it evolving. Here's the relevant code. My function updates 'T'; z is just a vector of the same length.
% Plot every hundredth iteration; this is so I can see if it's changing.
c = c + 1;
if c == 100
c = 0;
fig = figure(1);
axh = axes;
plot(axh,T,z)
hold all
grid on
set(gca,'YDir','Reverse')
title('Evolving Geotherm')
xlabel('Temperature (K)'); ylabel('Depth (m)')
end
This will display ONLY the latest data; none of the previous plots remain. I get the same results when I use 'hold on' and 'drawnow'. This seems like a really simple bit of code.
What's going on here? Why won't the previous plots remain?
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Accepted Answer
Chris
on 28 Oct 2021
Edited: Chris
on 28 Oct 2021
You are regenerating the figure and axes every time the if condition triggers. About the only thing you need inside the if is the plot() command. The other stuff should go before the for loop (but inside the function).
fig = figure(1);
axh = axes
hold all
grid on
set(gca,'YDir','Reverse')
title('Evolving Geotherm')
xlabel('Temperature (K)'); ylabel('Depth (m)')
c = 0;
for idx = 1:whatever
% Do some loop stuff...
c = c+1;
if c == 100
c = 0;
plot(axh,T,z)
end
end
6 Comments
Chris
on 3 Nov 2021
I was searching for other reasons it could be failing. If the function were calculating one point each time it's called, over repeated calls, it might not have access to all points to pass to plot. I was stretching my imagination a bit, since I couldn't see how the function was working.
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