MATLAB: Is there a factor of 1/2 in the equation used to compute portfolio turnover constraint in “setTurnover” in the Financial toolbox

constraintFinancial Toolboxoptimizationportfoliosetturnoverturnover

The equation used for the portfolio turnover constraint in the function "setTurnover" is provided in the documentation as follows:
1' *1/2* | Port - InitPort | <= Turnover
Why is this factor of half included? If I wish to have a maximum turnover of 20%, do I need to provide a value of the "turnover" argument as 0.2, or do I need to consider this factor and provide a value of 0.2/2=0.1?
Link to documentation page for "setTurnover": 
https://www.mathworks.com/help/releases/R2020a/finance/portfolio.setturnover.html#description

Best Answer

If you wish to have a maximum turnover of 20%, you can provide the value of the "turnover" argument as 0.2. In the calculation of the portfolio turnover, only one among sales/buys is considered (whichever is lower) and hence the factor of (1/2) is inherently considered in the turnover value. So you need not account for the factor of (1/2) explicitly.
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