Why do I keep getting matrix dimensions must agree?

2018 7 10
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更新时间：2018 7 10
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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;

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James Tursa
James Tursa 2018-7-10
编辑：James Tursa 2018-7-10

0 个投票

>> size(v0)
ans =
1 4
>> size(theta)
ans =
1 6
So it is complaining about the v0 .* sin(theta) operation

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Taylor Gates
Taylor Gates 2018-7-10
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
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
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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