Why do I keep getting matrix dimensions must agree?

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;

Answer 1

[James Tursa]

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

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

[Taylor Gates]

Okay I changed them both to be the same size and I now get this. g= 9.81

v0=[5,10,15,20,25,30];

theta= [6, .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

Error using .* Matrix dimensions must agree.

Error in BallTrajectory (line 11) x=v0.*(theta).*t

[James Tursa]

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]

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