EMA Slope First Flip Signal

1. EMA Calculation:
It calculates 4 Exponential Moving Averages:

EMA 5 – very fast (captures short-term moves)

EMA 9 – fast

EMA 21 – medium

EMA 50 – long-term trend

2. Slope Calculation:
It finds the slope of each EMA using:

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slopeX = emaX - emaX[1]
This checks if the EMA is rising (slope > 0) or falling (slope < 0).

3. Trend Condition:
Buy condition: All 4 EMA slopes must be positive

Sell condition: All 4 EMA slopes must be negative

4. First Signal Logic:
It only flashes a signal when the direction changes.

For example:

If EMAs were not all rising before, but now all are → BUY

If EMAs were not all falling before, but now all are → SELL

Prevents repeated signals during the same trend.

5. Safe Boolean Handling:
Uses bool(condition[1]) to access previous state without error

Avoids using nz() or na() on booleans (which causes errors)

📈 What You See on Chart:
✅ Green "BUY" label below candle when all EMA slopes turn positive for the first time

❌ Red "SELL" label above candle when all EMA slopes turn negative for the first time

🔄 No duplicate signals in the same direction — only on reversal