asset (string Name) : int

Parameters:

Returns:

Usage:

assetAdd (string Name, var Price, var Spread, var RollLong, var RollShort, var PipVal, var PipCost, var MarginCost, var Leverage, var LotAmount, var Commission, string Symbol)

Parameters:

Usage:

assetList (string Filename, string Select): int

Parameters:

Returns:

Usage:

assetType (string Name) : int

Parameters:

Returns:

Remarks:

• If the asset function is used, it must be called in the first run (INITRUN) of the script. All variables and flags that affect the price data array and bar creation, such as BarPeriod, BarZone, LookBack, Detrend, StartDate, EndDate, TICKS, BarMode, UpdateDays, AssetList, History etc. must be set before calling asset. Otherwise the simulation period can not be determined and the script will produce an Error 030 message.
• Calling asset() by script is not exactly the same as selecting the asset with the Asset scroll box. If the script contains no asset call, the scroll box asset is selected _after_ the first run, and its name is appended to the training files for being able to train different assets separately.
• The order of asset() calls does matter. When the BR_FLAT flag is not set, price quotes from the first asset in the script are used to create the array of bars. Gaps in the price history of the first asset are thus reflected in the price data of all further assets. Price histories have normally no data for periods when the asset is not traded, for instance during the weekend, or at night for assets that are only traded during business hours. It is therefore recommended to set first the asset with the most complete price history (for instance, a currency pair that is traded 24 hours). When a subsequent asset has a gap where the first asset has none - for instance, outside market hours - the gap is filled with price data from the previous bar. This produces a different price curve and can cause indicators to behave differently in a portfolio. For avoiding such an effect, either use the BR_FLAT flag or don't combine assets with very different market hours.
• Every asset() call switches the asset parameters, asset variables, trade statistics and OptimalF factors to the values of the selected asset. At begin of the simulation, asset parameters are loaded from the asset list. If the asset is not found in the list, an error message will be printed and defaults are substituted for the asset parameters.
• In [Trade] mode, asset() causes the asset prices to be downloaded from the broker. If this is not desired or if the broker does not support that asset, add a '#' to the Symbol field in the asset list, or add an external price source such as QUANDL:, GOOGLE:, AV: to the symbol.
• For selecting all assets of the asset list in a loop, use while(asset(loop(Assets))). For counting them in a variable int N, use for(N = 0; Assets[N]; N++).
• The trading time of an asset can be set up with AssetZone, AssetMarket, and AssetFrame. Trading can be restricted to market times with the BR_LEISURE flag.
• The current asset name is stored in the Asset string; its full symbol, including counter currency and exchange, is stored in the Symbol string. Call asset(Asset) for loading the asset selected by the Scrollbox already in the INITRUN. Otherwise it's automatically loaded after the INITRUN.
• For running the same strategy with multiple assets, use the loop function; for running the strategy with all available assets from the asset list, use loop(Assets). The Assets array contains the names of all available assets. For enumerating assets in the script, use for(listed_assets) or for(used_assets).
• Artificial assets can be created by combining the prices from several real assets (see example).
• By passing an empty string (asset("")), a dummy asset is created with all prices at 1. This is useful when a real asset is not needed, f.i. for testing filters or indicators with artificial price curves.
• When loading price data, the prices are checked for plausibility dependent on the Outlier parameter. If a bar has invalid data, such as extreme outliers or prices at zero, it is automatically corrected. Setting Detrend = NOPRICE; before calling asset() prevents that asset and price data is checked and outliers are removed.
• If only a single asset is selected in the script, the [Asset] scrollbox is automatically set to that asset. If multiple assets are selected, the [Asset] scrollbox is unchanged and can be used to determine the price curve in the resulting chart.
• For adding a new asset to the available asset set, see the description under Asset List.
• Assets must be subscribed before their prices are available. The asset function subscribes the asset automatically, but some brokers have a limit to the number of subscribed assets. Some platforms, for instance MT4, need a long time after subscribing an asset before prices are available.
• Any asset requires memory. The memory requirement in bytes can be estimated with the formula Years / BarPeriod * 15 MB, where Years is the number of backtest years (use 1 for live trading). The LEAN and LEANER flags reduce the memory requirement by about 50%, the TICKS flag increases it by 32 bytes per historical price quote.

Examples:

// trade multiple strategies and assets in a single script
function run()
{
  BarPeriod = 240;
  StartDate = 2010;
  set(TICKS); // set relevant variables and flags before calling asset()








































































// call different strategy functions with different assets
  asset("EUR/USD");
  tradeLowpass();
  tradeFisher();
  
  asset("GBP/USD");
  tradeAverage();
  
  asset("SPX500");
  tradeBollinger();  
}

// For adding a new asset to the [Assets] scrollbox,
// click [Trade] with the script below. 
// Then edit History\AssetsFix.csv and copy the line 
// beginning with "Copper" over from History\Assets.csv.
function run()
{
  asset("Copper");     // add "Copper" to assets.csv
}

// Basket trading - generate a snythetic asset "USD" 
// combined from the USD value of EUR, GBP, and AUD
var priceUSD()
{
  var p = 0;
  asset("GBP/USD"); p += price();
  asset("AUD/USD"); p += price();
  asset("EUR/USD"); p += price();
  return p;
}

// basket trade function with stop limit
int tradeUSD(var StopUSD)
{
  if((TradeIsLong && priceUSD() <= StopUSD) 
    or (TradeIsShort && priceUSD() >= StopUSD)) 
      return 1;   // exit the trade
  else return 0;  // continue the trade
}

// open a trade with the synthetic asset and a stop loss  
void enterLongUSD(var StopDistUSD)
{
  var StopUSD = priceUSD()-StopDistUSD;
  asset("GBP/USD"); enterLong(tradeUSD,StopUSD);
  asset("AUD/USD"); enterLong(tradeUSD,StopUSD);
  asset("EUR/USD"); enterLong(tradeUSD,StopUSD);
}

void enterShortUSD(var StopDistUSD)
{
  var StopUSD = priceUSD()+StopDistUSD;
  asset("GBP/USD"); enterShort(tradeUSD,StopUSD);
  asset("AUD/USD"); enterShort(tradeUSD,StopUSD);
  asset("EUR/USD"); enterShort(tradeUSD,StopUSD);
}
 
// plot a price curve of the synthetic asset
// (the plot command is linked to the last used asset -
// so "EUR/USD" must be selected in the scrollbox)
function run() 
{
  set(PLOTNOW);
  plot("USD",priceUSD(),0,RED);
}

See also: