how to get rid of imaginary numbers, after a root.
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oskar
on 25 Oct 2013
Commented: Kumaresh Kumaresh
on 14 Jun 2022
hi, i´m a beginner in matlab and i have been making a tracejtory with a basketball. my problem now is with the time.
This is a part of my script. My speed and angle are two vectors, because of the vectors sometimes the roots will be an imaginary number and (at=atand....) will get error. How do I do if i only want real numbers to go into at=atand....
time = roots([-g./2, v0y, y0-H]);
time = max(time);
at=atand((h0*cos(V))/((h0*sin(V))-(g*tid)));
thanks for your time=)
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Accepted Answer
Muruganandham Subramanian
on 25 Oct 2013
time = roots([-g./2, v0y, y0-H]);
time = max(time);
time=real(time);
at=atand((h0*cos(V))/((h0*sin(V))-(g*tid)))
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More Answers (2)
Simon
on 25 Oct 2013
Hi!
What do you expect, physically? Your trajectory is a parabola with negative prefactor in front of t^2. So, the apex is the highest point of your curve. If it is negative you won't find real roots of the polynom. Pyhsically this means you throw your ball from below the earth's surface and it is falling downwards ... ;-)
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