# Stochastic RSI

## Technical Analysis Indicator: stochrsi ## Function Prototype

/* Stochastic RSI */
/* Type: indicator */
/* Input arrays: 1    Options: 1    Output arrays: 1 */
/* Inputs: real */
/* Options: period */
/* Outputs: stochrsi */
int ti_stochrsi_start(TI_REAL const *options);
int ti_stochrsi(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 Stochastic RSI is a momentum oscillator to help identify trends.

It takes one parameter, the period n.

First, Relative Strength Index is calculated using the period n.

Then Stochastic RSI is calculated for each bar as follows:

$$max_{t} = maximum(rsi_{t}, rsi_{t-1}, ..., rsi_{t-n+1})$$
$$min_{t} = minimum(rsi_{t}, rsi_{t-1}, ..., rsi_{t-n+1})$$
$$stochrsi_{t} = \frac{rsi_{t}-min_{t}}{max_{t}-min_{t}}$$

## Example Usage

### Calling From C

/* Example usage of Stochastic RSI */
/* Assuming that 'input' is a pre-loaded array of size 'in_size'. */
TI_REAL *inputs[] = {input};
TI_REAL options[] = {5}; /* period */
TI_REAL *outputs; /* stochrsi */

/* Determine how large the output size is for our options. */
const int out_size = in_size - ti_stochrsi_start(options);

/* Allocate memory for output. */
outputs = malloc(sizeof(TI_REAL) * out_size); assert(outputs != 0); /* stochrsi */

/* Run the actual calculation. */
const int ret = ti_stochrsi(in_size, inputs, options, outputs);
assert(ret == TI_OKAY);


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

-- Example usage of Stochastic RSI
stochrsi = ti.stochrsi(input, 5)


## Example Calculation

period = 5

dateinputstochrsi
2005-11-0181.59
2005-11-0281.06
2005-11-0382.87
2005-11-0483.00
2005-11-0783.61
2005-11-0883.15
2005-11-0982.84
2005-11-1083.99
2005-11-1184.55
2005-11-1484.360.66
2005-11-1585.531.00
2005-11-1686.541.00
2005-11-1786.891.00
2005-11-1887.771.00
2005-11-2187.29-0.54

## Other Indicators

Previous indicator: Stochastic Oscillator

Next indicator: Vector Subtraction

Random indicator: Maximum In Period