numden (Symbolic Math Toolbox)

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

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

[n,d] = numden(x/y + y/x) returns

```
n = 
x^2+y^2

d = 
y*x
```

The statements

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

return

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

d =
[1, b]
```

null poly