# RefUsage2.efs

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RefUsage2.efs

File Name: RefUsage2.efs

Description:
The function, ref(), is used to refer to previously returned values of a formula's indicator. This example formula demonstrates the usage of ref() for formulas that return multiple values or indicators to the chart.

Formula Parameters:

NA

Notes:
The formula uses two basic moving average studies and outputs information to the Formula Output Window. To view the results, open the output window before applying the formula to a chart from the "Tools" menu.

RefUsage2.efs

EFS Code:

```/***  syntax: ref(nRelativeOffset, nNumBars)   ***

These examples are based on formulas that return multiple values.  For example:
return new Array(vValue1, vValue2);

See RefUsage.efs for examples of formulas that return a single values. For example:
return vValue;

var myRef = ref(-1)     Returns an array of the previous bar's values:
myRef = vMA1 from -1 bar ago.
myRef = vMA2 from -1 bar ago.

var myRef = ref(-2, 2)  Returns a two dimentional array of values for bars -2 to -1 bars ago:
myRef = vMA1 from -2 bars ago.
myRef = vMA2 from -2 bars ago.
myRef = vMA1 from -1 bar ago.
myRef = vMA2 from -1 bar ago.

var myRef = ref(-1, -2) Returns a two dimentional array of values for bars -1 to -2 bars ago:
myRef = vMA1 from -1 bar ago.
myRef = vMA2 from -1 bar ago.
myRef = vMA1 from -2 bars ago.
myRef = vMA2 from -2 bars ago.

Note:   VERY IMPORTANT!!

When using ref() it is very important that you incorporate some logic into your
code that will ensure that ref() returns a valid result.  See the "BarCntr" logic
below.  If you don't use the BarCntr logic or some other technique, you will get
unfavorable results.

**********************************************/

var study1 = new MAStudy(10, 0, "Close", MAStudy.Simple);
var study2 = new MAStudy(20, 0, "Close", MAStudy.Simple);

function preMain() {
setPriceStudy(true);
}

var BarCntr = 0;
function main() {
var vMA1 = study1.getValue(MAStudy.MA);
var vMA2 = study2.getValue(MAStudy.MA);

if (getBarState() == BARSTATE_NEWBAR) {
BarCntr += 1;
}

/***  BarCntr logic  ***/
if (BarCntr > 20) {     // We're using 20 because our longest MAStudy requires a minimum of 20 bars.
var myRef = ref(-1);
if (myRef == null) return;
//var myRef = ref(-2, 2);
//var myRef = ref(-1, -2);
var myValue1 = myRef;
var myValue2 = myRef;
}

// Open the Formula Output Window from the tools menu to view the values of myRef.
if (BarCntr > 20) {
debugPrintln("Bar Index: " + getCurrentBarIndex() + "    myValue1= " + myValue1 + "  myValue2= " + myValue2);
}

return new Array(vMA1, vMA2);
}```