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Derivatives

The polyder function computes the derivative of any polynomial. To obtain the derivative of the polynomial p = [1 0 -2 -5],

q = polyder(p)

q =
     3     0    -2

polyder also computes the derivative of the product or quotient of two polynomials. For example, create two polynomials a and b:

a = [1 3 5];
b = [2 4 6];

Calculate the derivative of the product a*b by calling polyder with a single output argument:

c = polyder(a,b)

c =
     8    30    56    38

Calculate the derivative of the quotient a/b by calling polyder with two output arguments:

[q,d] = polyder(a,b)

q =
    -2    -8    -2

d =
     4    16    40    48    36

q/d is the result of the operation.

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