Why do I keep getting matrix dimensions must agree?

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Taylor Gates 2018-7-10

评论： Taylor Gates 2018-7-10

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;

James Tursa 2018-7-10

编辑：James Tursa 2018-7-10

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

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

James Tursa 2018-7-10

tf is a vector. What are you expecting to get with the t=0:0.01:tf ?

What is your ultimate goal here? To produce multiple plots with different values of tf?

Taylor Gates 2018-7-10

Yes that’s the goal. Doing multiple plots with different inputs for initial velocity and launch angle.

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