## Function Prototype

```
/* Aroon Oscillator */
/* Type: indicator */
/* Input arrays: 2 Options: 1 Output arrays: 1 */
/* Inputs: high, low */
/* Options: period */
/* Outputs: aroonosc */
int ti_aroonosc_start(TI_REAL const *options);
int ti_aroonosc(int size,
TI_REAL const *const *inputs,
TI_REAL const *options,
TI_REAL *const *outputs);
```

## Description

This documentation is still a work in progress. It has omissions, and it probably has errors too. If you see any issues, or have any general feedback, please get in touch.

The Aroon Oscillator indicator can help determine when the market is developing a trend.

It takes one parameter: period `n`

.

Calculation is as follows:

$$aroon^{down}_{t} = 100\frac{n-low_{t}}{n}$$

$$aroon^{up}_{t} = 100\frac{n-high_{t}}{n}$$

$$aroonosc_{t} = aroon^{up}_{t}-aroon^{down}_{t}$$

where `l`

is the number of bars back to the lowest value in the previous `n`

bars, and
`h`

is the number of bars back to the highest value in the previous `n`

bars.

## See Also

## References

## Example Usage

### Calling From C

```
/* Example usage of Aroon Oscillator */
/* Assuming that 'high' and 'low' are pre-loaded arrays of size 'in_size'. */
TI_REAL *inputs[] = {high, low};
TI_REAL options[] = {5}; /* period */
TI_REAL *outputs[1]; /* aroonosc */
/* Determine how large the output size is for our options. */
const int out_size = in_size - ti_aroonosc_start(options);
/* Allocate memory for output. */
outputs[0] = malloc(sizeof(TI_REAL) * out_size); assert(outputs[0] != 0); /* aroonosc */
/* Run the actual calculation. */
const int ret = ti_aroonosc(in_size, inputs, options, outputs);
assert(ret == TI_OKAY);
```

### Calling From Lua (with Tulip Chart bindings)

```
-- Example usage of Aroon Oscillator
aroonosc = ti.aroonosc(high, low, 5)
```

## Example Calculation

period = 5

date | high | low | aroonosc |
---|---|---|---|

2005-11-01 | 82.15 | 81.29 | |

2005-11-02 | 81.89 | 80.64 | |

2005-11-03 | 83.03 | 81.31 | |

2005-11-04 | 83.30 | 82.65 | |

2005-11-07 | 83.85 | 83.07 | |

2005-11-08 | 83.90 | 83.11 | 80.00 |

2005-11-09 | 83.33 | 82.49 | 80.00 |

2005-11-10 | 84.30 | 82.30 | 100.00 |

2005-11-11 | 84.84 | 84.15 | 20.00 |

2005-11-14 | 85.00 | 84.11 | 40.00 |

2005-11-15 | 85.90 | 84.03 | 60.00 |

2005-11-16 | 86.58 | 85.39 | 80.00 |

2005-11-17 | 86.98 | 85.76 | 100.00 |

2005-11-18 | 88.00 | 87.17 | 60.00 |

2005-11-21 | 87.87 | 87.01 | 60.00 |

## Chart

## Other Indicators

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