I am trying to find the zeroes of the following symbolic function.
syms x moment =20*heaviside(x - 8)*(x - 8) - (3*x^2*heaviside(x))/4 + 5*heaviside(x - 20)*(x - 20) +... (3*heaviside(x - 20)*(x - 20)^2)/4; fplot(diff(moment,1),[-2 20])solve(diff(moment,1) == 0, x, 'MaxDegree', 4);extrema = vpa(ans, 6)subs(moment,extrema)
Matlabs outputs
extrema =-1.0ans =0.0
However, the first derivative of the above moment function has a number of zeroes located at points other than -1, for example at approximately x = 13. Could someone please explain how all the zeroes or the zeroes in a particular range can be found?
Best Answer