The function returns the handle of the Relative Vigor Index indicator.
[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 RVI calculation.
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.
The buffer numbers are the following: 0 - MAIN_LINE, 1 - SIGNAL_LINE.