# which

Gives a brief description on the origin of a function.

## Syntax

which('A')

## Inputs

`A`- Function name.

## Outputs

This function returns no values.

## Examples

Simple which
example:

`which('sqrt')`

`'sqrt' is a built-in function`

If a user made variable matches a built in function. Which will still
indicate that the given variable is still a built-in
function:

```
sqrt = 5
which('sqrt')
```

`'sqrt' is a built-in function`

User function
example:

```
function z=sqrt(a)
z=a/2;
end
which('sqrt')
```

`'sqrt' is a user function`