Question about EMA Calculation.

[noabai]

Hello. I am trying to adapt a pinescript code for NT8. I am having a rather incomprehensible difficulty with EMAs. Indeed, although the bar data are identical, the ema function of pinescript and that of ninjatrader do not return the same result.
So my stupid question: are there several ways to calculate an EMA? Does each platform have its own?
For example, here are the differences between TradingView (TW) and NinjaTRADER 8 (NT8): And this difference goes well beyond the rounding of decimals.

TW: 20409.74 NT8: 20410.55
TW: 20356.14 NT8: 20356.79
TW: 20310.51 NT8: 20311.03
TW: 20321.41 NT8: 20321.83
TW: 20441.98 NT8: 20442.31​

Please help me understand

[noabai]

Finally, I don't know if the EMAs are calculated differently but comparing the logs allowed me to see that the open data are the same but a "weirdness" in TRdaingView.

TradingView :

2024-10-15T00:00:00.000+02:00 ;Open : 20637.5 ;EMA(9) : 20345.0939209805
2024-10-16T00:00:00.000+02:00 ;Open : 20340 ;EMA(9) : 20344.0751367844
2024-10-17T00:00:00.000+02:00 ;Open : 20332 ;EMA(9) : 20341.6601094275
2024-10-18T00:00:00.000+02:00 ;Open: 20385.5 ;EMA(9): 20350.428087542
2024-10-21T00:00:00.000+02:00 ;Open: 20495.75 ;EMA(9): 20379.4924700336
2024-10-22T00:00:00.000+02:00 ;Open: 20518.25 ;EMA(9): 20407.2439760269
2024-10-23T00:00:00.000+02:00 ;Open: 20522.75 ;EMA(9): 20430.3451808215
2024-10-24T00:00:00.000+02:00 ;Open: 20299.5 ;EMA(9): 20404.1761446572
2024-10-25T00:00:00.000+02:00 ;Open: 20385 ;EMA(9): 20400.3409157258
2024-10-27T23:00:00.000+01:00 ;Open: 20524 ;EMA(9): 20425.0727325806
2024-10-28T23:00:00.000+01:00 ;Open: 20508 ;EMA(9) : 20441.6581860645 **** NOT ON CHART ***
2024-10-29T23:00:00.000+01:00 ;Open : 20725 ;EMA(9) : 20498.3265488516
2024-10-30T23:00:00.000+01:00 ;Open : 20486 ;EMA(9) : 20495.8612390813
2024-10-31T23:00:00.000+01:00 ;Open : 20065.25 ;EMA(9) : 20409.738991265
2024-11-01 **** NOT IN LOG BUT ON THE CHART ***
2024-11-04T00:00:00.000+01:00 ;Open: 20141.75 ;EMA(9): 20356.141193012
2024-11-05T00:00:00.000+01:00 ;Open: 20128 ;EMA(9): 20310.5129544096
2024-11-06T00:00:00.000+01:00 ;Open: 20365 ;EMA(9): 20321.4103635277
2024-11-07T00:00:00.000+01:00 ;Open: 20924.25 ;EMA(9): 20441.9782908222
2024-11-08T00:00:00.000+01:00 ;Open: 21225 ;EMA(9): 20598.5826326577​

NinjaTrader :

2024-10-15 23:00:00;OPen: 20637.5;EMA(9): 20343.5763065492
2024-10-16 23:00:00;OPen: 20340;EMA(9): 20344.7610452393
2024-10-17 23:00:00;OPen: 20332;EMA(9): 20349.4088361915
2024-10-18 23:00:00;OPen: 20385.5;EMA(9): 20376.2270689532
2024-10-21 23:00:00;OPen: 20495.75;EMA(9): 20404.8816551625
2024-10-22 23:00:00;OPen: 20539;EMA(9): 20432.30532413
2024-10-23 23:00:00;OPen: 20522.75;EMA(9): 20389.944259304
2024-10-24 23:00:00;OPen: 20299.5;EMA(9): 20388.0054074432
2024-10-25 23:00:00;OPen: 20385;EMA(9): 20410.1543259546
2024-10-28 22:00:00;OPen: 20524;EMA(9): 20427.5234607637
2024-10-29 22:00:00;OPen: 20508;EMA(9): 20481.3187686109
2024-10-30 22:00:00;OPen: 20725;EMA(9): 20492.0050148887
2024-10-31 22:00:00;OPen: 20486;EMA(9): 20397.954011911
2024-11-01 22:00:00;OPen: 20065.25;EMA(9): 20349.0132095288
2024-11-04 23:00:00;OPen: 20141.75;EMA(9): 20296.410567623
2024-11-05 23:00:00;OPen: 20128;EMA(9): 20305.4784540984
2024-11-06 23:00:00;OPen: 20365;EMA(9): 20423.1827632787
2024-11-07 23:00:00;OPen: 20924.25;EMA(9): 20583.496210623​

[NinjaTrader_Gaby]

Hello noabai,

Thank you for your post.

While our team can't comment on how other platforms calculate their EMA, you can see the open-source code for NinjaTrader's EMA in the NinjaScript Editor.

If you have questions about TradingView's EMA, I suggest you reach out to them directly for clarification on how it is calculated.