I have a figure in which I plot some disperse points and then a trajectory. I want to switch between different trajectories by plotting them in the same figure as the points, but without creating new figures, i.e., "erasing" the first trajectory and then plotting the new one.
Is there a way of doing this?
Perhaps this little demo will be helpful:
xy = rand(20,2);
figure
% Plot first iteration and output handles to each
h = plot(xy(:,1),xy(:,2),'b.',xy(1:2,1),xy(1:2,2),'r-');
axis([0 1 0 1])
% Update second plot by setting the XData and YData properties of the handle
for i = 2:size(xy,1)-1
set(h(2),{'XData','YData'},{xy(i:i+1,1),xy(i:i+1,2)})
drawnow
pause(0.1);
end
You should read up on handle graphics in Matlab and the get and set functions.
Related
The code below plots multiple contour maps at different locations on the Z axis specified by Zlevel. However, I have more than one Z data points of interest, hence I would like to use a for loop.
Zlevel=[0 1];
figure(1)
hold on
[~,h1]=contourf(xx,yy,zz(:,:,1)); h1.ContourZLevel=Zlevel(1);
hold on
[~,hh1]=contour(xx,yy,yy); hh1.ContourZLevel=h1.ContourZLevel;
hold on
[~,h2]=contourf(xx,yy,zz(:,:,2)); h2.ContourZLevel=Zlevel(2);
hold on
[~,hh2]=contour(xx,yy,yy);hh2.ContourZLevel=h2.ContourZLevel;
hold off
I was thinking I could have something like this:
figure(1); hold on;
for i=1:length(Zlevel)
[~,h(i)]=contourf(xx,yy,zz(:,:,i)); h(i).ContourZLevel=Zlevel(i);
hold on
[~,hh(i)]=contour(xx,yy,yy); hh(i).ContourZLevel=Zlevel(i);
hold on
end
hold off
I have tried it and I can't make it work. I am probably not understanding matlab's object handling. So if someone could help me out and explain to me why I can't do what I am trying to do and point me in the right direction, I would really appreciate it!
Thanks!
I don't understand very well why you need 2 calls to contourf per plot, as the secodn should only create some bad lines on your image....
Is this what you want?
% dummy data
[xx,yy,zz] = peaks;
zz(:,:,2)=-zz(:,:,1);
zz(:,:,3)=-2*zz(:,:,1);
zz(:,:,4)=2*zz(:,:,1);
Zlevel=[0 0.25 0.5 1];
figure(1)
hold on
for ii=1:length(Zlevel)
[~,h(ii)]=contourf(xx,yy,zz(:,:,ii)); h(ii).ContourZLevel=Zlevel(ii);
end
view(3)
I want to plot histogram fit and kernel Density curve in one plot means in I figure ks density curve and histfit in one frame .
Can someone help me how to do that.
I am just presenting an example code what I want to do.
Thanks a lot .
x = rand([1 50])
figure(1)
histfit(x)
hold on
[f,xi] = ksdensity(x);
hold off
figure
plot(xi,f);
The function calls for plotting are incorrect. Essentially, hold on asks MATLAB to plot everything thereafter, overlapping the previous figure. hold off disables this and overwrites the previous figure. Hence, run the code like this:
x = rand([1 50])
figure(1)
histfit(x)
hold on
[f,xi] = ksdensity(x);
plot(xi,f);
hold off
Until now i had only 1 axis in my GUI to I used to just plot directly using plot command. Plus i need to plot these in a loop.
for i = 1:length(sig)
plot(sig(i).time,sig(i).signal,sig(i).time,updated(i).filter,)
hold on
end
Now i have 2 axes in my GUI, how can I make a certain plot appear in 1st axis and another in my 2nd axis
Now for example i need to plot the below in the 2nd axis
for i = 1:length(sig)
plot(sig(i).time,sig(i).fil,sig(i).time,updated(i).sig,)
hold on
end
Any help will be appriciated
You could specify the axes for hold and plot functions. Considering you have two axes, h1 and h2 inside your figure, you could do the following:
hold(h1, 'on')
hold(h2, 'on')
for i = 1:length(sig)
plot(h1, sig(i).time,sig(i).signal,sig(i).time,updated(i).filter)
plot(h2, sig(i).time,sig(i).fil,sig(i).time,updated(i).sig)
end
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
All the three variables I am using to plot are matrix of size 1x1x100. I am using this code line to plot:
hold on;
for i=1:100
plot3(R_L(:,:,i),N_Pc(:,:,i),CO2_molefraction_top_of_window(:,:,i),'o');
xlabel('R_L');
ylabel('N_P_c');
zlabel('CO_2')
end
However, I am not getting the third axis, and hence the third variable CO2_molefraction_top_of_window on the plot. May I know where am I wrong?
Besides the above question, but on the same subject, I want to know if there is any option where I can plot 4 dimensional plot just like the 3 dimensional plot which can be drawn using plot3?
So I had the same problem when using plot3. For some reason, using the hold on command "flattens" the plot. I'm not sure why, but I suspect it has something to do with the operation hold on performs on the plot.
Edit: To clarify, the 3d plot is still there, but the perspective has been forced to change. If you use the "rotate 3D" tool (the one with an arrow around a cube), you can see the graph is 3d, the default perspective is just straight on so only two axes are visible and it appears flat.
Just a note --- you only need to do the xlabel ylabel zlabel commands once (outside the loop).
Also:
is there any reason your matrices are 1x1x100 instead of just 100x1 or 1x100?
Because if you reshape them to 2D you can just do the plotting in one hit.
What do you mean by "missing third axis"? When I run your code (or as close as I can get, since you didn't provide a reproducible example), I do get a 3rd axis:
.
X = rand(1,1,100); % 1x1x100 X matrix
Y = rand(1,1,100); % 1x1x100 Y matrix
Z = rand(1,1,100); % 1x1x100 Z matrix
% Now, we could do a for loop and plot X(:,:,i), Y(:,:,i), Z(:,:,i),
% OR we can just convert the matrix to a vector (since it's 1x1x100 anyway)
% and do the plotting in one go using 'squeeze' (see 'help squeeze').
% squeeze(X) converts it from 1x1x100 (3D matrix) to 100x1 (vector):
plot3(squeeze(X),squeeze(Y),squeeze(Z),'o')
xlabel('x')
ylabel('y')
zlabel('z')
This gives the following, in which you can clearly see three axes:
If it's the gridlines that you want to make the graph look "more 3D", then try grid on (which is in the examples in the Matlab help file for plot3, try help plot3 from the Matlab prompt):
grid on
You will have to clarify "missing third axis" a bit more.
I came across a similar problem and as #Drofdarb's the hold on seems to flatten out one axis. Here is a snippet of my code, hope this helps.
for iter = 1:num_iters:
% hold on;
grid on;
plot3(tita0,tita1, num_iters,'o')
title('Tita0, Tita1')
xlabel('Tita0')
ylabel('Tita1')
zlabel('Iterations')
hold on; % <---- Place here
drawnow
end
As opposed to:
for iter = 1:num_iters:
grid on;
hold on; % <---- Not here
plot3(tita0,tita1, num_iters,'o')
title('Tita0, Tita1')
xlabel('Tita0')
ylabel('Tita1')
zlabel('Iterations')
% hold on;
drawnow
end