CallFunction - Passing Previous Bar Values

[ndeacon]

Hi,

I am using CallFunction to pass values from one efs which is called by another efs. That is working fine, except I now wish to pass a value from the called efs for the current bar (easy), but also for the PREVIOUS bar (which I'm not finding so easy to do).

I'd be grateful if somebody would could explain to me (in simple terms please) how I pass an output value from one efs to another efs for both for the current bar and the previous bar.

Many thanks.

Deax.

[eSignal_JasonK]

Hello Deax,

If my understanding of what you need is correct, I think all you need to do is use a global variable to store the return value for the current bar's callFunction() value and another global to record the ending value at NEWBAR. When that bar closes, the second global value will be storing the previous bar's closing value from your callFunction call like below.

var value = null;
var value1 = null;  // store previous bar's closing value

function main() {

    if (getBarState() == BARSTATE_NEWBAR) value1 = value;
    
    value = callFunction(...);
    
    return value;
} 

[ndeacon]

Hi Jason,

I am trying to take a value (for the current bar) from a called efs and compare it with the value for the previous bar. So my coding to call the value is:

var MACD = null;
MACD = callFunction("CalledupMACD.efs", "main");
if (MACD == null) return;
var vMACD = MACD[1];
if (vMACD == null) return;

I was then trying to compare the previous bar's value of MACD with the current bar's to see if it was greater or less (to tell me if the MACD is falling or rising):

I tried to do this using the following code:

if ((vMACD(-1))<(vMACD(0)) ..............................

but it doesn't seem to be working.

I'd be grateful for your view of the coding of the above problem.

Many thanks in advance.

Deax.

[eSignal_JasonK]

Hello Deax,

You can't use vMACD(0). The () characters are the function call operators. vMACD(0) is telling JavaScript to run a function named vMACD() with a parameter of 0 being passed to it. Unless you've created a user-defined function in your formula named vMACD, the function does not exist. What you need to do is use the code snippet I provided previously and name the two global variables, vMACD and vMACD1.

var vMACD = null;
var vMACD1 = null;  // store previous bar's closing value

function main() {

    if (getBarState() == BARSTATE_NEWBAR) vMACD1 = vMACD;
    
    var myMACD = callFunction(...);
    vMACD = myMACD[1];
    
    if (vMACD1 < vMACD) {
        // run this code
    }

    
    return vMACD;
}