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Hi, any reason why this indicator does not work? TIB says condition is ok, but it does not show the arrows in the chart....

Do not put it in the chart but below the chart (change the setting in the Start Icon)
I think you calculation does not show in the chart due to scale. The chart auto adjust to show the prices but your calculations are not similar to the chart prices so you do not see them

does not work either and it would make absolutely no sense to not show it in the chart window. I want to mark the bars fulfilling the criteria

rgds
ax

It does make sense to plot it below because your calculation might be out of the chart prices range
Let's say you are around the 1.3 prices, a calculation can be like:
=(1.34-1.33)/(1.32-1.31)=1
1 will be plotted out of the chart because the chart centers around the 1.3 range

Your problem is related to issues when you divide by zero, to fix your formula needs to add a small constant like this: (1.34-1.33)/(1.32-1.31+0.0000001)

Do not use > 0. The indicator builder plots continuous signals. You cannot use conditions. In the Strategy Builder you use the indicator and add the condition.

the thing should just draw an arrow if the condition is true - the indicator shows so called "turn-around-bars". I want an arrow pointing to the bar if high1>high2 and close1<open1

if the indicator is <0 then this condition is true. sad that it does not work

Unfortunately conditions are not supported in the indicator builder. It will be supported in coming versions (maybe in the fall)