Folding: integer 'to' is expected: NaN

[muscleman]

I am writing an indicator that will mark the last swing low within 100 bars and swing high after it. Right now I have the following code. It kinda outputs what I wanted so far, but the warning on the chart says "Folding: integer 'to' is expected: NaN", which makes me wonder if there is anything wrong I did. Can anyone please help?

def condition;
def swingLowOffset;
def swingHighOffset;
def swingHigh;
def currentLow; # lowest in the last 3 bars
def currentHigh; # highest in the last 3 bars

if (IsNaN(close[-1] and !IsNaN(close[0]))) {
    # Only run this in the last bar.
    # Find the lowest bar in the last 100 bars excluding the current 3 bars
    swingLowOffset = GetMinValueOffset(low[3], 100) + 3;
    currentLow = Lowest(low, 3);
    currentHigh = Highest(high, 3);
    swingHigh = fold i = 0 to swingLowOffset with tempHigh = high[0] do Max(tempHigh, GetValue(high, i));
    swingHighOffset = 0;
    if (swingHighOffset == swingLowOffset or swingHighOffset <= 2) {
        condition = no;
    }
    else {

        condition = yes;
    }
}
else {
    condition = no;
    swingLowOffset = 0;
    swingHighOffset = 0;
    swingHigh = 0;
    currentLow = 0;
    currentHigh = 0;
}
AddChartBubble(1, low, BarNumber(), Color.WHITE, no);
AddChartBubble(swingLowOffset != 0, high, swingLowOffset + ":" + swingHighOffset + ":" + swingHigh, Color.WHITE, no);
plot data = condition;

 

[Joshua]

I can not reproduce the error. My original suspicion was that you may be running the script on a chart that doesn't have 100+ bars of price history, but in that case, GetMinValueOffset() already throws the assertion before Fold does. Can you provide more context, such the exact symbol, aggregation, and chart interval - or whether its for a scan, chart, or column?

Thinkscript is quite fluid in terms of resolving expressions in place of variables, assuming a constant is not expected.

fold i = 0 to (if isNAN(swingLowOffset) then 0 else swingLowOffset) with tempHigh = high do Max(tempHigh, GetValue(high, i))

Although, this may just end pushing the error to another line down the road, its just something to keep in mind.

 

[halcyonguy]

I am writing an indicator that will mark the last swing low within 100 bars and swing high after it. Right now I have the following code. It kinda outputs what I wanted so far, but the warning on the chart says "Folding: integer 'to' is expected: NaN", which makes me wonder if there is anything wrong I did. Can anyone please help?

def condition;
def swingLowOffset;
def swingHighOffset;
def swingHigh;
def currentLow; # lowest in the last 3 bars
def currentHigh; # highest in the last 3 bars

if (IsNaN(close[-1] and !IsNaN(close[0]))) {
    # Only run this in the last bar.
    # Find the lowest bar in the last 100 bars excluding the current 3 bars
    swingLowOffset = GetMinValueOffset(low[3], 100) + 3;
    currentLow = Lowest(low, 3);
    currentHigh = Highest(high, 3);
    swingHigh = fold i = 0 to swingLowOffset with tempHigh = high[0] do Max(tempHigh, GetValue(high, i));
    swingHighOffset = 0;
    if (swingHighOffset == swingLowOffset or swingHighOffset <= 2) {
        condition = no;
    }
    else {

        condition = yes;
    }
}
else {
    condition = no;
    swingLowOffset = 0;
    swingHighOffset = 0;
    swingHigh = 0;
    currentLow = 0;
    currentHigh = 0;
}
AddChartBubble(1, low, BarNumber(), Color.WHITE, no);
AddChartBubble(swingLowOffset != 0, high, swingLowOffset + ":" + swingHighOffset + ":" + swingHigh, Color.WHITE, no);
plot data = condition;

...last swing low within 100 bars and swing high after it.

what happens if there isn't a swing high after the last swing low?

i would look for the last pattern, swing high.
save the barnumber of it.

then look for a swing low, that has the highest barnumber AND is less than the barnumber of the swing high.

 

[muscleman]

The warning I see is an exclamation mark on the upper left of the chart. It is not an error. Only a warning. I think what it wants to warn is that fold's "to" needs to be an integer but I passed in a variable so it is not sure if it is an integer, But since I get this variable value from GetMinValueOffset call, I know it is good. But thinkscript doesn't have the notion of an integer as Double is the customer defined variable type.
Anyway.. thank you for responding to my question. It is a warning so it doesn't really impact the functionality of the script.

 

[Svanoy]

@muscleman
It's is your expansion area causing the issue.
Change your definition of 'swingLowOffset' to:

swingLowOffset = if !isnan(close) then GetMinValueOffset(low[3], 100) + 3 else 0;

or you could just change your expansion area to zero.

 

[muscleman]

Thank you. Oh I didn't know the code runs on extension areas as well.