how to find derivative ?

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aysha 2014-4-14

编辑： aysha 2014-4-14

I need to write a c code that do the derivative if we have value of x and how save previous value of it to us it in derivative code using malloc ??

Also am using S-function for that and derivative part to solve my equation: force=-ks * x - ( kd * (dx/dt))

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