MATLAB Function Reference

polyder

Polynomial derivative

Syntax

• k = polyder(p)
  k = polyder(a,b)
  [q,d] = polyder(b,a)
  

Description

The polyder function calculates the derivative of polynomials, polynomial products, and polynomial quotients. The operands a, b, and p are vectors whose elements are the coefficients of a polynomial in descending powers.

k = polyder(p) returns the derivative of the polynomial p.

k = polyder(a,b) returns the derivative of the product of the polynomials a and b.

[q,d] = polyder(b,a) returns the numerator q and denominator d of the derivative of the polynomial quotient b/a.

Examples

The derivative of the product

is obtained with

• a = [3 6 9];
  b = [1 2 0];
  k = polyder(a,b)
  k = 
      12    36    42    18
  

This result represents the polynomial

See Also

conv, deconv

polyarea

polyeig

© 1994-2005 The MathWorks, Inc.