var xOpen = null; 
var vPP = null;
var vR1 = null;
var vS1 = null;
var vR2 = null;
var vS2 = null;  

function main() {

    if(isMonthly() || isWeekly())
    return;

    
    if(bInit == false){
        xHigh  = high(inv("D"));
        xLow   = low(inv("D"));
        xOpen = open(inv("D")); 
        bInit = true;
    }

    
    var vHigh  = xHigh.getValue(-1);
    var vLow   = xLow.getValue(-1);
    var vOpen = xOpen.getValue(0); 
    if(vHigh == null || vLow == null || vOpen == null)
    return;

    
    vPP = (vHigh+vLow+2*vOpen)/4;
    vR1 = 2*vPP-vLow;
    vS1 = 2*vPP-vHigh;
    vR2 = (vPP-vS1)+vR1;
    vS2 = vPP-(vR1-vS1);  

    
    return new Array(vR2, vR1, vPP, vS1, vS2);
}