[Metastockusers] Need help with a formula

["Alan Davidson" <alan_davidson22@xxxxxxxxxxx>]

I'd be grateful for any help with BarsSince() in the following
formula fragment.

I haven't included the first bit of code because I don't think it's 
relevant.

Regards,
Alan


{-----------------------------------}
....
....
R; {MACD}
Z; {Signal} {end of Roy's stuff}
Hist:=(R-Z); {Histogram}
Hist;
{1}Buy:=ROC(Hist,1,POINTS)>0 AND Hist<0;
{2}Sell:=ROC(Hist,1,POINTS)<0 AND Hist>0;
{3}{If(Buy,1,0);}
{4}If((Buy AND (BarsSince(Buy)>BarsSince(Sell))),1,0);
{5}{If(Sell,-1,0);}
{6}If((Sell AND (BarsSince(Sell)>BarsSince(Buy))),-1,0);
{-----------------------------------}

Explanation:
{1} Buy if histogram ticks up from below its centreline.
{2} Sell if histogram ticks down from above its centre line.
{3}(Commented out.) Plot the buy trigger . This worked fine, but as
long as the histogram is oscillating below its centre line, it
continues to give buy signals on each up-tick.
{4} This is my attempt. I thought it said: "Buy if histogram ticks up
from below its centreline AND the previous buy/sell signal was a
sell." In other words, if the previous signal was a buy, don't add to
the position. This doesn't work. The plot is a horizontal line at
Y=0 (the histogram centre line).  This means that the test is always 
FALSE.
{5} (Commented out.) Again, this worked fine, but could give
multiple contiguous sell signals.
{6} Similar to {4}.




 
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