iBandsOnArray for mql5

[Seyedmasoud Hashemi]

hi everyone 

i wonder someone tried to make a replacement for this function in mql5, because it does not exist on the mql5 

i reasserted and it need to formula of Standard deviation  for array which is not exist in the mql5,

if someone have formula of standard deviation on mql5 i think it's possible to make it the   iBandsOnArray

thanks