How to update a 3D surface plot?

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Anuj Rekhy
Anuj Rekhy 2016-6-13
回答： Star Strider 2016-6-13
I have a 3D cascade plot. It has Amplitude Vs Frequency data on X and Y axis. It has amplitude on Z axis. I want to create an animation where the evolution of data on X Y axis is updated slowly in the Z direction as the time progresses.
  2 个评论
Walter Roberson
Walter Roberson 2016-6-13
Which plot call did you use to create the 3D cascade plot?
Anuj Rekhy
Anuj Rekhy 2016-6-13
I used the surf(X,Y,Z) to get the plot. Now I want to animate it with time.

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回答（2 个）

Star Strider
Star Strider 2016-6-13
See if modifying this code snippet with your surf call and data does what you want:
[X,Y] = meshgrid(linspace(-5, 5, 50)); % Create Mesh Data
fcn = @(x,y,k) k*x.^2 + y.^2; % Function To Plot (Vary Sign Of ‘x’)
v = [1:-0.05:-1; -1:0.05:1]; % Multiplier For ‘x’
for k1 = 1:2 % One Cycle For ‘Up’, One FOr ‘Down’
for k2 = v(k1,:) % Select A Direction From ‘v’
surfc(X, Y, fcn(X,Y,k2)) % Draw Surface
axis([-5 5 -5 5 -30 50]) % Set ‘axis’ For All Plots
drawnow % Draw Plot
pause(0.1) % Create Evenly-Timed Steps For Animation
end
end
You will have to experiment with it to get the result you want.
KSSV
KSSV 2016-6-13
h.fig = figure ;
h.ax = handle(axes) ; %// create an empty axes that fills the figure
h.surf = handle( surf( NaN(2) ) ) ; %// create an empty "surface" object
%Display the initial surface
set( h.surf , 'XData',X , 'YData',Y , 'ZData',Z )
for i = 1:n
% update surface, load the data
h.surf.ZData = Z ;
end
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Anuj Rekhy
Anuj Rekhy 2016-6-13
编辑：Anuj Rekhy 2016-6-13
Only X is constant in all the plots there are 50 plots for example. Then both the Y and Z values are changing in every frame and needs an update.
I am attaching a reference figure for your understanding of the problem. Here Time is Y data and the amplitude is Z data and X data is Frequency that is constant throughout.
I wanted to show time evolution of such a graph - such that it starts from zero and goes till 25 sec.
Walter Roberson
Walter Roberson 2016-6-13
for i = 1:n
Z = ... new data
set(h, 'ZData', Z);
drawnow()
end

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