MATLAB: Do I keep getting matrix dimensions must agree

matrixmatrix dimensionsphyics

I keep getting this error and I can't figure out why. Here's my code

g= 9.81

v0=[5,10,15,20];

theta= [0, .17453293, .52359878, .78539816, 1.04719755,1.57079633];

tf=2*v0.*sin(theta)/g;

t=0:0.01:tf; hold all x=v0.*(theta).*t;

y=v0*sin(theta)*t-g*t.^2/2;

hold on plot(x,y)

Matrix dimensions must agree.

Error in BallTrajectory (line 7) tf=2*v0.*sin(theta)/g;

Best Answer

>> size(v0)
ans =
     1     4
>> size(theta)
ans =
     1     6

So it is complaining about the v0 .* sin(theta) operation

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thetaList=[0, .17453293 .52359878 .78539816 1.04719755 1.57079633];
figure
hold on
for i = 1:length(thetaList)
    theta=thetaList(i);
      g= 9.81;
      v0= 5 ;
      tf=2.*v0.*sin(theta)/g;
      t=0:0.01:tf;
      x=v0*cos(theta)*t;
      y=v0*sin(theta).*t - 0.5*g*t.^2;
      plot(x,y)
  end

MATLAB: Matrix dimensions must agree

First for some reason you make t twice as large than it previously was

t=[t -t] % see here

And then you try to multiply it with ang which is half of t.
numel(t) should be equal to numel(ang) to prevent that error.

Best Answer

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MATLAB: Help with plotting multiple angles/velocties

MATLAB: Matrix dimensions must agree

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