TradeStation EasyLanguage Tutorial 179 uses AppStorage to store the price of a symbol when the tutorial program is first applied (and the date when the program was applied.) The program then calculates and plots the percentage difference between the initial value and the current close.
It is an easy-to-use and has, potentially, many applications.
The value of the date and ‘last’ price when first applied are retained even when RadarScreen is refreshed (by pressing CTR-R) or when the workspace is saved, closed and later re-opened.
If the user wanted to re-store all the initial values then the program should be deleted from Radarscreen and re-applied.
For an explanation of ‘Load Additional Data for Accumulative Calculations’ and MaxBarsBack in RadarScreen see: Tutorial 25.
The tutorial uses a TokenList to process a comma delimited string. TokenLists make it very easy to refer to individual elements of the comma delimited string.
The tutorial actually demonstrates two programs. In the first the Last keyword is used to refer to the stock price when the program is first applied to RadarScreen. In the second version, Close is used.
Video showing the development of the tutorial 179 program
- Storing data in AppStorage
- Using TokenList functionality to parse a comma delimited list
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