This code snippet demonstrates how to use the Gann Square of 9 method to predict the next price level based on the current value of the RSI (Relative Strength Index) over 14 periods. The Gann Square of 9 is a trading tool that is used to determine key levels of support and resistance and predict future prices. This example is tailored for users of ProRealTime’s ProBuilder language, specifically for versions 10.3 and 11.

#### Code Snippet:
For ProRealTime v10.3:

defparam drawonlastbaronly=true
//X = starting price
X = rsi[14]
//a = angle
a = 45
//Y = next price
Y = square(sqrt(X) + a/180)
//plot the next price
drawline(barindex, X, barindex+1, Y)
return X as "price/indi value"

For ProRealTime v11:

defparam drawonlastbaronly=true
//X = starting price
X = rsi[14]
//a = angle
a = 45
//Y = next price
Y = square(sqrt(X) + a/180)
//plot the next price
drawsegment(barindex, X, barindex+10, Y) coloured(255,200,0) style(line,3)
drawpoint(barindex, X, 3) coloured(255,0,0)
drawpoint(barindex+10, Y, 3) coloured(255,0,0)
return X as "price/indi value"

#### Explanation and Steps:

• Parameter Setup: The defparam drawonlastbaronly=true directive ensures that drawing commands only affect the last bar on the chart, keeping the display clean and focused on recent data.
• Calculating the Starting Price: X = rsi[14] assigns the value of the 14-period RSI to X, which serves as the starting point for our calculation.
• Setting the Angle: The angle a is set to 45 degrees, a common angle used in Gann theory to determine significant price movements.
• Calculating the Next Price: Y = square(sqrt(X) + a/180) calculates the next price level based on the Gann Square of 9 method. This involves taking the square root of X, adjusting it by the angle converted to radians (a/180), and then squaring the result to get Y.
• Drawing the Prediction: In version 10.3, drawline is used to connect the current price/index to the next predicted price/index. In version 11, drawsegment enhances visualization by allowing customization of the line’s color and style, and drawpoint marks the current and predicted prices with colored points for better visibility.
• Output: The function returns the current RSI value as “price/indi value”, which can be used for further analysis or display.

This example provides a practical application of Gann’s theory in financial markets analysis using ProBuilder, illustrating how to project future price levels from a given RSI value.