## POLYDER Polynomial Coefficient Differentiation

Section: Optimization and Curve Fitting

### Usage

The`polyder`

function returns the polynomial coefficients resulting
from differentiation of polynomial `p`

. The syntax for its use is either
pder = polyder(p)

for the derivitave of polynomial p, or

convp1p2der = polyder(p1,p2)

for the derivitave of polynomial conv(p1,p2), or still

[nder,dder] = polyder(n,d)

for the derivative of polynomial `n/d`

(`nder`

is the numerator
and `dder`

is the denominator). In all cases the polynomial
coefficients are assumed to be in decreasing degree.
Contributed by Paulo Xavier Candeias under GPL

### Example

Here are some examples of the use of`polyder`

--> polyder([2,3,4]) ans = 4 3

--> polyder([2,3,4],7) ans = 28 21

--> [n,d] = polyder([2,3,4],5) n = -20 -15 d = 25