MATLAB: How to generate this pin wheel toy dataset？

MATLABtoydata

I don't konw how to generate this pin wheel by code or Equation. Can someone help me?

Best Answer

How about this:

% Pin Wheel
r = 0:100;
v = 2*pi*r/200; % fit


n = 5;
m = 1; % fit
r0 = 0.5*max(r)^m; % fit
figure;hold on;
plot(0,0,'o');
for ii=1:n
    plot(r.^m.*sin(v+2*pi*(ii-1)/n)/r0, r.^m.*cos(v+2*pi*(ii-1)/n)/r0);
end

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MATLAB: How to generate this pin wheel by code or Equation

How about this:

% Pin Wheel
r = 0:100;
v = 2*pi*r/200; % fit


n = 5;
m = 1; % fit
r0 = 0.5*max(r)^m; % fit
figure;hold on;
plot(0,0,'o');
for ii=1:n
    plot(r.^m.*sin(v+2*pi*(ii-1)/n)/r0, r.^m.*cos(v+2*pi*(ii-1)/n)/r0);
end

MATLAB: Small “toy rocket” – Simulation

You're super close...

Just make one change to the height function so it looks like this one below:

function [h] = height(a,t,h0,v0,t0)
    h=h0+v0*(t-t0)+(1/2)*a*(t-t0).^2;
end

(Notice the .^ instead of ^ to signify element-wise exponentiation. This way you can pass entire vectors in place of t.)

Then, modify the main code by remove the for-loop and instead use something like

    v0=0; %Initial velocity
    h0=0; %Initial height
    t0=0; %Initial time
    g=9.81; %The gravitational constant        %Input variables
    F=input('Engine force (N): ');
    m=input('Mass (kg): ');
    dt=input('Precision/timesteps (s): ');        %Step one       
    t = t0: dt: 0.15;
    velocity1=velocity(acceleration(F,m,g),t,v0,t0);
    height1=height(acceleration(F,m,g),t,h0,v0,t0);
    plot(t,height1,'b',t,velocity1,'r');

Notice that t is now a vector and that I'm only calling the plot function once, the first curve (height vs. t) is blue ('b') and the second curve (velcoity1 vs t) is red. Hopefully that helps.

Best Answer

Related Solutions

MATLAB: How to generate this pin wheel by code or Equation

MATLAB: Small “toy rocket” – Simulation

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