Question about if statement/expressions

November 22nd, 2021, 12:27 PM

I'm thinking of creating several conditions and if they are all true, have an arrow painted on the screen. But there's a problem.
What I'm using is Thinkscript from Thinkorswim and it's saying that it expected an 'else block' where it says 'if', and I just don't get it, nor understand why that if statement is wrong.

def con1 = (MovAvgExponential("length" = 9)."AvgExp" crosses above
MovAvgExponential("length" = 20)."AvgExp" within 2 bars);

plot signal = if con1 is true
then SetPaintingStrategy(PaintingStrategy.BOOLEAN_ARROW_UP);

kevinkdog · November 22nd, 2021, 01:15 PM

bb117

I'm thinking of creating several conditions and if they are all true, have an arrow painted on the screen. But there's a problem.
What I'm using is Thinkscript from Thinkorswim and it's saying that it expected an 'else block' where it says 'if', and I just don't get it, nor understand why that if statement is wrong.

def con1 = (MovAvgExponential("length" = 9)."AvgExp" crosses above
MovAvgExponential("length" = 20)."AvgExp" within 2 bars);

plot signal = if con1 is true
then SetPaintingStrategy(PaintingStrategy.BOOLEAN_ARROW_UP);

You are posting in the Tradestation EasyLanguage forum. Maybe a mod will move this to the TOS section.

November 22nd, 2021, 01:44 PM

kevinkdog

You are posting in the Tradestation EasyLanguage forum. Maybe a mod will move this to the TOS section.

Done....

November 22nd, 2021, 02:32 PM

Yeah sorry about that, first time here and didn't even realize the ThinkOrSwim sub-forum, I created the account and this thread all while I was in a different page that had another coding question I had, answered, and it was under the EasyLanguage sub-forum and forgot to check/change the forum I was in.

November 22nd, 2021, 03:46 PM

Note that in thinkScript�, the "else" block is mandatory.

Try to add "ELSE" with no expression like:

plot signal = if con1 is true then SetPaintingStrategy(PaintingStrategy.BOOLEAN_ARROW_UP) ELSE ;

or use a dummy statement like:

plot signal = if con1 is true then SetPaintingStrategy(PaintingStrategy.BOOLEAN_ARROW_UP) ELSE dummy=0;

It wants to know what to do in case con1 is false.

November 23rd, 2021, 05:51 PM

thank you for your reply in the end I tried something different, just gotta tweak the parameters and conditions until I get the result I want.

November 24th, 2021, 08:28 PM

It's probably looking for Double.NaN, which means Not a Number. It doesn't plot anything when the condition is false.

Here is some code I've used before.

plot arrowAddUp = if con1 then low else Double.NaN;
plot arrowAddDn = if con2 then high else Double.NaN;

And then this defines the plot.

arrowAddUp.SetPaintingStrategy(PaintingStrategy.ARROW_UP);
arrowAddUp.SetDefaultColor(CreateColor(143, 239, 191));
arrowAddUp.SetLineWeight(1);

arrowAddDn.SetPaintingStrategy(PaintingStrategy.ARROW_DOWN);
arrowAddDn.SetDefaultColor(CreateColor(255, 126, 156));
arrowAddDn.SetLineWeight(1);

December 19th, 2021, 06:07 AM

New to thinkscript so there may be a better way to code this but the below paints the arrows it looks like your after

def con1 = (MovAvgExponential("length" = 9)."AvgExp" crosses above
MovAvgExponential("length" = 20)."AvgExp" within 2 bars);
def con2 = con1 is true;
plot con3 = con2;
con3.SetPaintingStrategy(PaintingStrategy.BOOLEAN_ARROW_UP);

Question about if statement/expressions

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Question about if statement/expressions