Why am I getting doubles?

I've just tried to quickly code a PSAR change for a custom indicator and it seems to work fine for the most part but I seem to get random spots where it doesn't match up to my chart visual and sometimes I get one mark after another.

sar=iSAR(NULL,0,0.03,0.2,i);
sar2=iSAR(NULL,0,0.03,0.2,i+1);

sar2!=sar

Those are the relevant bits out of the code and I would have assumed it to be a decent enough solution. i.e. only give a signal if the previous bar is not the same as the current one indicating a change. If it was just random signals I could troubleshoot it a little easier but I get randoms AND 2 consecutive signals which shouldn't happen because the previous sar value is the same as this one.

Suggestions anyone?

I profess to being very lacking in knowing the programming in MQL4, practically everything I know comes from DaveL and his custom indicator from me and I have rather self-taught myself as much as I can and in the end I am just trying to use some logical progression in my brain and it has worked so far in terms of altering things.

Oh, DaveL deserves a medal for being awesome too

Ah, sorted my own problem out.

I had to point sar2 also to a previous bar iHigh

Forgot it, stupid person.

Still I did a forum search and apparently nobody has written this so in case anyone wants to know in future

sar=iSAR(NULL,0,0.03,0.2,i);
sar2=iSAR(NULL,0,0.03,0.2,i+1);


Buy
sar<=iHigh(NULL,0,i) && sar2>=iHigh(NULL,0,i+1)

Sell
sar>=iHigh(NULL,0,i) && sar2<=iHigh(NULL,0,i+1)



Use this in conjunction with other indicators obviously, most indicators are strong enough to be used on their own but anyway just in case anyone else was curious that's how I did it. If anyone knows a cleaner, tidier way i'm game