I want to get the highest of the last n bars; n is a variable. Unfortunately, thinkscript won't let me do Highest(high[1],n) because n should be a constant. Do you know a workaround or a different way to accomplish the same thing? Essentially, I just want to get the highestAll minus the first bar, so i figured highest(high[1],BarNumber()-1) would do, but it doesn't...

You are probably looking for something like this. Its evaluating each bar based on the previous high and keeps increasing the result if it finds a new high value. It avoids the last bar by referencing high[1] rather than the current high. This will operate on all chart data, but if you want to only go back to a certain point you'll need to add more conditions.

 

Code

def highest = if high[1] > highest[1] then high[1] else highest[1]; plot b = highest;

If you want more examples of this and many other helpful tips, check out this link. I found it very helpful in learning thinkscript. TOS and Thinkscript Snippet Collection