The function returns the handle of the Relative Strength Index indicator. It has only one buffer.
[in] The symbol name of the security, the data of which should be used to calculate the indicator. The NULL value means the current symbol.
[in] The value of the period can be one of the ENUM_TIMEFRAMES values, 0 means the current timeframe.
[in] Averaging period for the RSI calculation.
[in] The price used. Can be any of the price constants ENUM_APPLIED_PRICE or a handle of another indicator.
Returns the handle of a specified technical indicator, in case of failure returns INVALID_HANDLE. The computer memory can be freed from an indicator that is no more utilized, using the IndicatorRelease() function, to which the indicator handle is passed.