animatedline/addpoints/drawnow

Syntax

h = animatedline('Marker','o');

x = 1:5;

y = 1:5;

addpoints(h,x,y)

Examples

h = animatedline;

axis([0 4*pi -1 1])

x = linspace(0,4*pi,2000);

for k = 1:length(x)

    y = sin(x(k));

    addpoints(h,x(k),y);

    drawnow

end

h = animatedline;

axis([0 4*pi -1 1])

x = linspace(0,4*pi,2000);

for k = 1:length(x)

    y = sin(x(k));

    addpoints(h,x(k),y);

    drawnow limitrate

end

drawnow

Line Animations

a1 = animatedline('Color',[0 .7 .7]);

a2 = animatedline('Color',[0 .5 .5]);

axis([0 20 -1 1])

x = linspace(0,20,10000);

for k = 1:length(x);

    % first line

    xk = x(k);

    ysin = sin(xk);

    addpoints(a1,xk,ysin);

    % second line

    ycos = cos(xk);

    addpoints(a2,xk,ycos);

    % update screen

    drawnow limitrate

end

getframe

Syntax

F = getframe

F(i) = getframe

Examples

plot(rand(5))

F = getframe;

imshow(F.cdata)

Z = peaks;

figure('Renderer','zbuffer');

surf(Z);

axis tight;

set(gca,'NextPlot','replaceChildren');

for j = 1:20

surf(sin(2*pi*j/20)*Z,Z)

F(j) = getframe;

end

disp('now to the movie')

movie(F,20) % Play the movie twenty times

movie

Syntax

movie(M)

Examples

figure

Z = peaks;

surf(Z)

axis tight manual

ax = gca;

ax.NextPlot = 'replaceChildren';

loops = 40;

F(loops) = struct('cdata',[],'colormap',[]);

for j = 1:loops

    X = sin(j*pi/10)*Z;

    surf(X,Z)

    drawnow

    F(j) = getframe;

end

% play movie twice

movie(F,2)

VideoReader

Syntax

v = VideoReader(filename)

v = VideoReader('xylophone.mp4');

while hasFrame(v)

    video = readFrame(v);

end

whos video

v.CurrentTime = 2.5;

currAxes = axes;

while hasFrame(v)

    vidFrame = readFrame(v);

    image(vidFrame, 'Parent', currAxes);

    currAxes.Visible = 'off';

    pause(1/v.FrameRate);

end

VideoWriter

Syntax

v = VideoWriter('peaks.avi');

open(v);

Z = peaks;

surf(Z);

axis tight manual

set(gca,'nextplot','replacechildren');

for k = 1:20

    surf(sin(2*pi*k/20)*Z,Z)

    frame = getframe;

    writeVideo(v,frame);

end

close(v);

Examples

Animated Sine Wave

x=0:10:360;

y=sind(x);

theta=0;

while 1

    theta=theta+1;

    y_plot=y*sind(theta);

    plot(x,y_plot);

    axis([0,360,-1.2,1.2]);

    pause(0.001);

end

Examples

x=linspace(0,1,100);

[X,Y] = meshgrid(x,x);

N=100; % Number of frames

for i = 1:N

    % Example of plot

    Z = sin(2*pi*(X-i/N)).*sin(2*pi*(Y-i/N));

    surf(X,Y,Z)

    % Store the frame

    M(i)=getframe(gcf); % leaving gcf out crops the frame in the movie.

end

movie(M)

Examples

% Draw a sphere

sphere

% Make the current axis box square in size

axis('square')

% Define title and labels for reference

title('Rotation of a sphere...')

xlabel('x'); ylabel('y'); zlabel('z')

% Modify azimuth (horizontal rotation) and update drawing

for az = -50 : .2 : 30

    view(az, 40)

    drawnow

end

% Modify elevation (vertical rotation) and update drawing

for el = 40 : -.2 : -30

    view(30, el)

    drawnow

end

% Define paraboloid

X = -2 : .1 : 2; Y = X;

[x, y] = meshgrid(X, Y);

z = .5 * (x.^2 + y.^2);

% Draw 3D figure, keep track of its handle

h = surf(x,y,z);

% Keep axes constant

axis([-2 2 -2 2 0 20])

% Define title and labels for reference

xlabel('x'); ylabel('y'); zlabel('z')

% Stretch paraboloid and show updates

for i = 1 : .1 : 5;

    set(h, 'xdata', x, 'ydata', y, 'zdata', i*z)

    drawnow

    pause(.1)

end

% Modify azimuth (horizontal rotation) and update drawing

for az = -37.5 : .5 : 30

    view(az, 30)

    drawnow

end

Examples

Algorism and Bushism of the Day


"It's a time of sorrow and sadness when we lose a loss of life."	"Milosevic has barely begun to incur the damage he will feel."

Lesson of the Day

The older you get, the more the important and unimportant separate.

Delighting in sacrifice

In an instant-on, one-click shopping universe, the idea of sacrifice is pretty alien. When the world might end tomorrow, when you can get what you want now, when debt is easier than ever to go into, why even consider sacrifice?

Because it's the single best way to achieve your goals. Satisfaction now almost always decreases the reserves we have to build an asset for later. Investing in something worth building always requires you to avoid getting what you want today. Sacrifice might mean giving up an expenditure, but it can also be the bold step of having a difficult conversation now instead of later.

Regardless of the goal, sacrifices make it more likely that you'll get there.

The journey toward that worthy goal, though, is a key part of the goal itself. We are never certain we'll reach our goal, one significant reason that so few people persist. But if the journey involves sacrifice, we're paying for that goal, the goal we're never sure to reach, every day.

Hence delight.

The act of sacrifice, of foregoing one thing in our journey toward another one, one more generous, virtuous and useful, is actually a little piece of the satisfaction of the goal itself.

If it comes easy, it's not the same.

Animation

Animaniacs?

Vintage Animation?

Anime?

animatedline/addpoints/drawnow

Syntax

Examples

Line Animations

getframe

Syntax

Examples

movie

Syntax

Examples

VideoReader

Syntax

VideoWriter

Syntax

Examples

Animated Sine Wave

Examples

Examples

Examples

Algorism and Bushism of the Day

Lesson of the Day

The older you get, the more the important and unimportant separate.

Word of the day

Never Gonna Give You Up

The End