Indicator not plotting properly

[Billmini]

I am trying to get this indicator to plot in real time but it only plot from the current time forward . What I am doing wrong to make this plot as any other indicator on a chart ? It is can not plotting any historical views only from current bar forward .
Thanks

//sorry this is so crude, but it does the job of
// plotting (75 LSMA), and the (21 LSMA on close, 21 LSMA on typical price,shifted 3 bars to the right).

// Quite a hack to get this to work in eSignal, trick is to
// use the linear regression basis line and plot the single point on each tick.
// 2nd trick: store the calculated 2nd 21 and print the value from 3 minutes ago.
//
// WL and 21s are drawn starting when formula starts - don't be put off
// by the flatness of the lines to start with. By next bar, the lines are
// tracing out their proper path.
//
// I cannot work out how to make this wotk for historical charts %^(
// so I take screenshots with Snagit at end of day for my personal reviews...

var studyA = new LinearRegressionStudy("Close", 75, 2.0);
var studyB = new LinearRegressionStudy("Close", 21, 2.0);
var studyC = new LinearRegressionStudy("OHLC/4", 21, 2.0);

var basisA_Arr = new Array();
var basisB_Arr = new Array();
var basisC_Arr = new Array();

var nCount = -1; // index for above arrays

var prev_high = 0;
var curr_high = 0;
var prev_low = 0;
var curr_low = 0;

function preMain() {
setPriceStudy(true);
setStudyTitle("TR WL and 21s");
setCursorLabelName("75LSMA",0);
setCursorLabelName("21LSMA",1);
setCursorLabelName("21LSMAS3",2);

//setDefaultBarFgColor(Color.blue, 0); // upper
setDefaultBarFgColor(Color.blue, 0); // basis
//setDefaultBarFgColor(Color.blue, 2); // lower

setDefaultBarFgColor(Color.blue, 1); // basis 21 LSMA
setDefaultBarThickness(2,1);

setDefaultBarFgColor(Color.magenta, 2); // basis 21 LSMA, shifted 3 bars forward
setDefaultBarThickness(2,2);

// show 75 LSMA as dotted line (VERY clear)
setPlotType(PLOTTYPE_DOT,0);

}

function main() {
//var vUpper = study.getValue(LinearRegressionStudy.UPPER);
var BasisA = studyA.getValue(LinearRegressionStudy.BASIS);
//var vLower = study.getValue(LinearRegressionStudy.LOWER);
var BasisB = studyB.getValue(LinearRegressionStudy.BASIS);
var BasisC = studyC.getValue(LinearRegressionStudy.BASIS);

curr_high = high(0);
curr_low = low(0);
curr_price = close(0);

var nBarState = getBarState();
if (nBarState == BARSTATE_NEWBAR) // start of new bar
{
nCount++;
}
else
{
// update throughout minute to catch very last update!
basisA_Arr[nCount] = BasisA;
basisB_Arr[nCount] = BasisB;
basisC_Arr[nCount+2] = BasisC;
}

return new Array(BasisA, BasisB, basisC_Arr[nCount]);
}

[gspiker]

Without going through the code too much, one question leaps to mind...you are doing a 75 period SMA. How many bars are on your chart? If you only have 80 bars then only the last 5 or so bars may get plotted.

You don't do a great deal of checking for bad returns, might I suggest a few more check for null returns for the price and LR returns.

var nIndex = getCurrentBarIndex();
var BasisA = studyA.getValue(LinearRegressionStudy.BASIS);

if (BasisA == null){
debugPrintln("BasisA null - Index = " + nIndex);
return;
}


If you do the above checks for each of the returns, I think you MIGHT figure out what is going on.