Difference between this 2 code lines?

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hi all,

can anyone explain, what is the difference, or what does on line do, what the other do not? sorry i'm not a coder, but very interested to understand.

thanks in advance

extern int LongEma=50;

double LEMA1=iMA(Symbol(),0,LongEma,0,MODE_EMA,PRICE_CLOSE,i+1);
double LEMA2=iMA(Symbol(),0,LongEma,0,MODE_EMA,PRICE_CLOSE,i);

[Ray]

Second one calculates the EMA at bar "i", first one calculates the EMA from the next older bar.

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phy:
Second one calculates the EMA at bar "i", first one calculates the EMA from the next older bar.

thx phy, you help me a lot!