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?
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4 Answers
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.
Comments
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);
Comments
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
