As we stated in another article about Matlab®; Matlab® provides various kinds of solutions for mathematical equation management. These tools save tremendous time to obtain the desired form of equations.

Here, we explain how to obtain fraction forms of symbolic equations in MatLab® by using the ‘numden()’ command. Take a look at the code example below that is executed in the command window of Matlab®, to understand the syntax and use of the ‘numden()’ command.

## How To Use ‘numden()’ Command In MatLab®?

```
>> syms a
y = a-3 + (3/(a-1)) - (2/(a+9));
[nominator, denominator]=numden(y)
nominator =
a^3 + 5*a^2 - 32*a + 56
denominator =
(a - 1)*(a + 9)
>>
```

First of all, we created a symbolic variable ‘a’ with the ‘syms’ command. We can use this variable to obtain our bulk equation. Our bulk equation is like above that is assigned to ‘y’.

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Consider a situation that we want to obtain the fraction form of this equation. So, we used the ‘numden()’ command as you see above.

We assigned two variables to ‘numden()’ as you see above which are ‘nominator’ and ‘denominator’. As you understand from the names, we receive the nominator of fraction form of the equation as an answer that is assigned to ‘nominator’, and ‘denominator’ as an answer.

## Conclusion

So, the use of the ‘numden()’ command in Matlab® is very simple to obtain fraction forms.

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