Indicator for when two conditions are met

Jack Sprat

New member
Hi!
I was trying to write a strategy that would give some sort of indication (vertical line, up/down arrow) when two conditions were met. What I have so far is :


addverticalLine( if price_trend crosses above 0 then high else double.nan);
addverticalLine( if price_trend crosses below 0 then low else double.nan);
addverticalLine( if up[1] < 1 and up > 0 then low else Double.NaN);
addverticalLine( if down[1] < 1 and down > 0 then high else Double.NaN);

What I would like is a line or arrow when both addverticalLine( if price_trend crosses above 0 then high else double.nan); and addverticalLine( if up[1] < 1 and up > 0 then low else Double.NaN); happen and then conversely when both addverticalLine( if price_trend crosses below 0 then low else double.nan); and addverticalLine( if down[1] < 1 and down > 0 then high else Double.NaN); happen.

I've been trying various things all day but the combinations I was coming up were still missing like half the signals. Any help would be greatly appreciated!

Thanks
 
Solution
you are using addverticalline() incorrectly.
it wants 4 parameters. you are giving it 1 and of the wrong data type.
i think, if you provide 1 parameter to a function, without the parameter name, it is assumed to be the first one. the first parameter is supposed to be true/false , to trigger it during a point in time, during a candle.
your formula results in a price value.

your code doesn't include what price_trend or up or down are , so they may be another problem.
i guessed that up and down are 2 conditions.

what i would do,
...add a formula to define price_trend , as a true/false value
...define variables for each condition that are true/false
...use those variable names as the 1st parameter in addverticalline( )


this won't work...
you are using addverticalline() incorrectly.
it wants 4 parameters. you are giving it 1 and of the wrong data type.
i think, if you provide 1 parameter to a function, without the parameter name, it is assumed to be the first one. the first parameter is supposed to be true/false , to trigger it during a point in time, during a candle.
your formula results in a price value.

your code doesn't include what price_trend or up or down are , so they may be another problem.
i guessed that up and down are 2 conditions.

what i would do,
...add a formula to define price_trend , as a true/false value
...define variables for each condition that are true/false
...use those variable names as the 1st parameter in addverticalline( )


this won't work until a formula for price_trend is added.

Code:
def price_trend = ?
def up = if price_trend crosses above 0 then 1 else 0;
def down = if price_trend crosses below 0 then 1 else 0;

# these are redundant, same as up and down
def cond1 = if up[1] == 0 and up == 1 then 1 else 0;
def cond2 = if down[1] == 0 and down == 1 then 1 else 0;

# the 4th parameter is line type. it can be left out
addverticalline( up, "UP", color.green );
addverticalline( down, "DOWN", color.red );

https://tlc.thinkorswim.com/center/reference/thinkScript/Functions/Look---Feel/AddVerticalLine
 
Solution
Great, thank you for your reply and explaining it for me. This is my first time trying to write an indicator so I'm still trying to figure it out. I appreciate the example and I'll see what I can work out!
Thanks
 

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