PARAM
- add user user-definable numeric parameter

Exploration / Indicators
(AFL 2.3)

• "name" - defines parameter name that will be displayed in the parameters dialog
• defaultval - defines default value of the parameter
• min, max - define minimum and maximum values of the parameter
• step - defines minimum increase of the parameter via slider in the Parameters dialog
• sincr - automatic section increment value (used by drag-drop interface to increase default values for parameters)

WARNING: default/min/max/step parameters have to be CONSTANT numbers. This is because these values are cached and are not re-read during subsequent formula evaluations.

ticker = ParamStr( "Ticker", "MSFT" );
sp = Param( "MA Period", 12, 2, 100 );
PlotForeign( ticker, "Chart of "+ticker, ParamColor( "Price Color", colorLightYellow ), styleCandle );
Plot( MA( Foreign( ticker, "C" ), sp ), "MA(" + WriteVal( sp, 1.0 ) + ")", ParamColor( "MA Color", colorRed ) );
Sample code 2:

sp = Param( "RSI Period", 12, 2, 100 );
r = RSI( sp );
Plot( r, "RSI("+WriteVal(sp,1.0)+")", ParamColor("RSI Color", colorRed ) );

Buy = Cross( r, 30 );
Sell = Cross( 70, r );

PlotShapes( shapeUpArrow * Buy + shapeDownArrow * Sell, IIf( Buy, colorGreen, colorRed ) );