numden

Numerator and denominator

Syntax

[N,D] = numden(A)

Description

[N,D] = numden(A) converts each element of A to a rational form where the numerator and denominator are relatively prime polynomials with integer coefficients. A is a symbolic or a numeric matrix. N is the symbolic matrix of numerators, and D is the symbolic matrix of denominators.

Examples

Find the numerator and denominator of the symbolic number:

[n, d] = numden(sym(4/5))
n =
4
 
d =
5

Find the numerator and denominator of the symbolic expression:

syms x y
[n,d] = numden(x/y + y/x)
n = 
x^2 + y^2

d = 
x*y

The statements

syms a b
A = [a, 1/b]
[n,d] = numden(A)

return

A =
[a, 1/b]
 
n =
[a, 1]

d =
[1, b]
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