I am doing something like this:
a = [1:100];
for i=1:100,
plot([1:i], a(1:i));
end
My issue is that the plot is not shown until the loop is finished.
How can I show/update the plot in every iteration?
Use DRAWNOW
a = [1:100];
for i=1:100,
plot([1:i], a(1:i));
drawnow
end
Alternatively, you may want to have a look at ANYMATE from the file exchange.
Another way to do this if you just want to visualise it without saving the animation, is to use refreshdata instead of plot for subsequent plots. You will still need to call drawnow for it to update on-screen.
either use
set(fig_handle,'XData',new_xdata_array)
set(fig_handle,'YData',new_ydata_array)
refreshdata
drawnow
or use
set(fig_handle,'XDataSource',xdata_array)
set(fig_handle,'YDataSource',ydata_array)
%call this whenever xdata_array and ydata_array are assigned new values to see it updated in the plot
refreshdata
drawnow
for your example, this might look like:
a=[1:100];
figure;
h=plot(1,a(1));
for i=2:100
set(h,'XData',[1:i])
set(h,'YData',a(1:i))
refreshdata
drawnow
end
It's not all that useful for simple line plots (for which plot(); drawnow; is simpler and faster), but when you need to create more complicated figures involving multiple plot types, this can be useful.
From the documentation for comet.m
t = 0:.01:2*pi;
x = cos(2*t).*(cos(t).^2);
y = sin(2*t).*(sin(t).^2);
comet(x,y);
Matlab allows you to sort-of automate a loop statement for variables
x = 0.0:0.1:2*pi
plot(x,cos(x));
is an example......
A lot of times you don't really need to plot 'in' a loop
Related
I am doing something like this:
a = [1:100];
for i=1:100,
plot([1:i], a(1:i));
end
My issue is that the plot is not shown until the loop is finished.
How can I show/update the plot in every iteration?
Use DRAWNOW
a = [1:100];
for i=1:100,
plot([1:i], a(1:i));
drawnow
end
Alternatively, you may want to have a look at ANYMATE from the file exchange.
Another way to do this if you just want to visualise it without saving the animation, is to use refreshdata instead of plot for subsequent plots. You will still need to call drawnow for it to update on-screen.
either use
set(fig_handle,'XData',new_xdata_array)
set(fig_handle,'YData',new_ydata_array)
refreshdata
drawnow
or use
set(fig_handle,'XDataSource',xdata_array)
set(fig_handle,'YDataSource',ydata_array)
%call this whenever xdata_array and ydata_array are assigned new values to see it updated in the plot
refreshdata
drawnow
for your example, this might look like:
a=[1:100];
figure;
h=plot(1,a(1));
for i=2:100
set(h,'XData',[1:i])
set(h,'YData',a(1:i))
refreshdata
drawnow
end
It's not all that useful for simple line plots (for which plot(); drawnow; is simpler and faster), but when you need to create more complicated figures involving multiple plot types, this can be useful.
From the documentation for comet.m
t = 0:.01:2*pi;
x = cos(2*t).*(cos(t).^2);
y = sin(2*t).*(sin(t).^2);
comet(x,y);
Matlab allows you to sort-of automate a loop statement for variables
x = 0.0:0.1:2*pi
plot(x,cos(x));
is an example......
A lot of times you don't really need to plot 'in' a loop
I used the plot command to plot a figure and then changed lots of its properties using set command. I also store the handle of the plot (say h1).
What I need is to use the handle to plot the same figure again later in my code. I checked the plot command and did not find any version that accepts handle. I also thought of getting the Xdata and Ydata and use them to re-plot the same figure.
What is the simplest solution?
Edit 1: A working sample code based on copyobj that PeterM suggested.
hf(1) = figure(1);
plot(peaks);
hf(2) = figure(2);
plot(membrane);
hf(3) = figure(3);
ha(1) = subplot(1,2,1);
ha(2) = subplot(1,2,2);
for i = 1:2
hc = get(hf(i),'children');
hgc = get(hc, 'children');
copyobj(hgc,ha(i));
end
Edit 2: I also found this function that can copy figures (including legend) into a subplot.
I have run into this situation before. Depending on what you are trying to do the function copyobj may be appropriate. This function lets you take the contents of one axes and copy it to a new figure.
Improving #PeterM nice answer, one easier way would be:
fig2H=copy(gcf) % or change gcf to your figure handle
But it depends on what you want, if you want only the axes, or the whole figure… (btw, it doesn't seem to copy the legend handle).
You can use saveas to save the figure in a file, and the open to load the exact same figure from this file.
This would be the laziest way to accomplish what you want.
% Sample plot
f1 = figure(1);
plot(0:0.1:2*pi, sin(0:0.1:2*pi));
f2 = figure(2);
% The code you need
saveas(f1, 'temp.fig')
f2 = hgload('temp.fig')
delete('temp.fig')
I have used the function figs2subplots (given in Edit2 in the original question) - it does the work and is very easy to use.
I want to plot two simultaneous plots in two different positions in Matlab, looped animations and both are different animations, one with hold on and another with hold off.
Also, one is 2D and one is 3D
I am doing something like this:
for i=1:some_number
axes('position',...)
plot(...);hold on;
axes('position',...)
clf
plot3(...) (or fill3 but has to do with 3d rendering)
view(...)
set(gca, 'cameraview',...)
set(gca,'projection',...)
mov(i)=getframe(gcf)
end
Q1. Do the set properties effect first axes? if so, how to avoid that?
Q2. In my plot hold on did not work. Both were instantenous. like using hold off. How do I make it work?
Q3. I hope the mov records both axes.
P.S. I hope clf is not a problem. I must use clf or if there are equivalents more suitable in my case do suggest me.
You need to store the return from the axes function and operate specifically on a given axes with subsequent function calls, rather than just the current axes.
% Create axes outside the loop
ax1 = axes('position',...);
ax2 = axes('position',...);
hold(ax1, 'on');
for i=1:some_number
plot(ax1, ...);
cla(ax2); % use cla to clear specific axes inside the loop
plot3(ax2, ...) (or fill3 but has to do with 3d rendering)
view(ax2, ...)
set(ax2, 'cameraview',...)
set(ax2,'projection',...)
mov(i)=getframe(gcf)
end
Here is a snippet from a piece of my code which plots orbits of three celestial bodies which I think will help you:
for i = 1:j, %j is an arbitrary number input by the user
plot(x, y, '*')
plot(x2, y2, 'r')
plot(xa, ya, '+')
grid on
drawnow %drawnow immediately plots the point(s)
hold on %hold on keeps the current plot for future plot additions
%dostuff to x,y,x2,y2,xa,ya
end
The two main functions you want are the drawnow and hold on.
Just to note: x,y,x2,y2,xa, and ya change with each iteration of the loop, I have just omitted that code.
EDIT: I believe the drawnow function will solve your problem with hold on.
I think this may solve your problem.
for i=1:some_number
axes('position',...)
plot(...);
drawnow %also note that you must not put the ; at the end
hold on %see above comment
axes('position',...)
clf
plot3(...) (or fill3 but has to do with 3d rendering)
view(...)
set(gca, 'cameraview',...)
set(gca,'projection',...)
mov(i)=getframe(gcf)
end
I've tried to do plot inside of a loop and it prints only the last plot.
How can i fix it?
I've tried to use hold on and drawnow after the plot definition but it didn't work.
This is my code:
for t=1:5
alive = Game(World , Generations, speed);
plot(hplot2,1:Generations,alive);
end
hold on should work. Try this:
figure
hplot2=gca;
hold on
for t=1:5
alive = rand(1,Generations);
plot(hplot2,1:Generations,alive);
end
Sticking in a "figure" has always worked for me.
for t=1:5
alive = Game(World , Generations, speed);
figure;
plot(hplot2,1:Generations,alive);
end
Since you are already passing the axes handle to plot, you only need to put something like pause(0.1) inside the loop, and your original source will work.
you can also use figure(t) to have 5 different figures.
If the function Game(World , Generations, speed) is a deterministic function - it gives the same output for every t. Therefore, every plot commands has exactly the same output and you cannot distinguish the first from the last plot.
Try plot a random series at each iteration (as in answer of shoelzer) and see if you see all 5 plots.
Additionally, you might want to use hold all instead of hold on: this way each plot will get a different color from the colormap.
I am doing something like this:
a = [1:100];
for i=1:100,
plot([1:i], a(1:i));
end
My issue is that the plot is not shown until the loop is finished.
How can I show/update the plot in every iteration?
Use DRAWNOW
a = [1:100];
for i=1:100,
plot([1:i], a(1:i));
drawnow
end
Alternatively, you may want to have a look at ANYMATE from the file exchange.
Another way to do this if you just want to visualise it without saving the animation, is to use refreshdata instead of plot for subsequent plots. You will still need to call drawnow for it to update on-screen.
either use
set(fig_handle,'XData',new_xdata_array)
set(fig_handle,'YData',new_ydata_array)
refreshdata
drawnow
or use
set(fig_handle,'XDataSource',xdata_array)
set(fig_handle,'YDataSource',ydata_array)
%call this whenever xdata_array and ydata_array are assigned new values to see it updated in the plot
refreshdata
drawnow
for your example, this might look like:
a=[1:100];
figure;
h=plot(1,a(1));
for i=2:100
set(h,'XData',[1:i])
set(h,'YData',a(1:i))
refreshdata
drawnow
end
It's not all that useful for simple line plots (for which plot(); drawnow; is simpler and faster), but when you need to create more complicated figures involving multiple plot types, this can be useful.
From the documentation for comet.m
t = 0:.01:2*pi;
x = cos(2*t).*(cos(t).^2);
y = sin(2*t).*(sin(t).^2);
comet(x,y);
Matlab allows you to sort-of automate a loop statement for variables
x = 0.0:0.1:2*pi
plot(x,cos(x));
is an example......
A lot of times you don't really need to plot 'in' a loop