Matlab discretes the differential equation and replaces the differential term with the differential term. The same would be true for humans solving systems like this. (10 pts) What is value of the second derivative for x=0. This article discusses how symbolic workflows can be improved by using symbolic equations and symbolic functions in MATLAB.Bottom line, it seems to be dropping the negative sign when evaluating x'(t), where x=Acos(Wn*t-phi).25*exp(-3*t) xdot = diff(x,t,1) xddot = diff(x,t,2) Then to plot these you have several options. These are used to solve various expressions with the help of functions available in Symbolic Math Toolbox. The form this dialog box takes varies by platform. The diff function is used to take the derivative of symbolic expressions.
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