Well, we're all newbies sometime -- it helps to fiddle with existing code...

Here's what you described:
---------------------------
MAshort:=Mov(C,50,S);
MAlong:=Mov(C,100,S);
Slope:=MAshort>Ref(MAshort,-1);

Sum(C>MAlong,50)>=50
AND Sum(Slope,100)>=30;


Not sure why you wanted a postive slope of 30 out of 100; you might experiment by changing that last line to "AND Sum(Slope,30)>=30;"

Also, you can use INPUT variables to change the parameters, without modifying the code. The above would look like this:

MA1:=Input("Short MA",1,500,50);
MA2:=Input("Long MA",1,500,100);
Length1:=Input("Close over MA",1,500,50);
SlopePositive:=Input("Slope Positive",1,500,30);
SlopePeriod:=Input("Slope Period",1,500,100);

MAshort:=Mov(C,MA1,S);
MAlong:=Mov(C,MA2,S);
Slope:=MAshort>Ref(MAshort,-1);

Sum(C>MAlong,Length1)>=Length1
AND Sum(Slope,SlopePeriod)>=SlopePositive;


Note that there is a limit of six (6) INPUT variables and a limit of 20 variables total in an indicator.

If you are going to "scan" in an Exploration, INPUT cannot be used, BUT you can "call" the indicator using FML and/or FMLVAR -- just set the "default" parameter to what you want to use in the Exploration.

Put the FML code in the FILTER tab; if you want to see the indicator value, put the exact same code in one of the Exploration COLUMNS.

Have fun.

Well, it wasn't quite clear to me from your description what the "30" & "100" meant -- in plain language, if it means the slope of a 100-period regression line of the 50 SMA staying positive for 30 periods, then your code looks right.

Although, since a regression line is used, I'd skip the 50 SMA and use regression on the close. Gets you closer to the data...

If it means something else, you'll have to clarify. It might help to quote the source.