Indexing cannot yield multiple results error

I have made a function where I call on other functions.

My mother-function coding looks like this:

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function [yvektor, xvektor] = trajectory(angle,speed,h)

dt = 0.01;

[vx, vy] = initialSpeed(angle, speed);

x0 = 0;

y0 = h;

i = 1;

y = h;

while y > 0

    [ax, ay] = acceleration(vx, vy);
    [vx, vy] = speed(vx, vy, ax, ay, dt);
    [x, y] = position(x0, y0, vx, vy, dt);

    yvektor(i) = y
    xvektor(i) = x

   i = i + 1;
end
end
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And my speed function looks like this:

----------------------------------------------

function [vx, vy] = speed(vx, vy, ax, ay, dt)

vx = vx + ax*dt vy = vy + ay*dt

end

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When i try to run the trajectory function, the error :

''Indexing cannot yield multiple results.

Error in trajectory (line 11) [vx, vy] = speed(vx, vy, ax, ay, dt);'' appears.

Any idea on what I've done wrong. I've been looking for mistypes for half an hour, but I'm starting to think this error is something deeper.

Can anyone help me, please?

Answer 1

[Mischa Kim]

Ole, the problem is in this statement

 vx = vx + ax*dt vy = vy + ay*dt

These should be two separate statements. Change it to

 vx = vx + ax*dt;
 vy = vy + ay*dt;