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Thread: Distribution - Heavisidefunction - Second Derivative

  1. #1
    Junior Member
    Mar 2008

    Distribution - Heavisidefunction - Second Derivative


    I have the following function:

    $\displaystyle \display\ f(t)= t \theta (t) + (\frac{1}{2}t^{2}-t+\frac{1}{2})\theta (t-1)+(t-2)\theta (t-2)+(-\frac{1}{4}t^{2}+\frac{5}{2}t-\frac{21}{4})\theta (t-3)+(-\frac{1}{4}t^{2}+3t-8)\theta (t-4)$

    I need the second derivate $\displaystyle f''(t)$

    How do I do this? Do I use the product rule like if would have been a "regular" function??

    $\displaystyle \display f'(t)=1\cdot\theta (t)+t\delta(t)$
    $\displaystyle \display+(t-1)\theta (t-1)+(\frac{1}{2}t^{2}-t+\frac{1}{2})\delta(t-1)+$
    $\displaystyle \display+\theta(t-2)+(t-2)\delta(t-2)+$
    $\displaystyle \display+(-\frac{1}{2}t+\frac{5}{2})\theta(t-3)+(-\frac{1}{4}t^{2}+\frac{5}{2}-\frac{21}{4})\delta(t-3)+$
    $\displaystyle +(-\frac{1}{2}+3)\theta(t-4)+(-\frac{1}{4}t^{2}+3t-8)\delta(t-4)$

    Is $\displaystyle f'(t)$ correct?

    Any guidance would be greatly appritiate it.
    Thank you
    Last edited by 4Math; Mar 15th 2011 at 10:08 AM.
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