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Hi

I am trying the demo

1. I am trying to create an indicator using something like the following calculation
iATR(NULL,0,100,i)/iATR(NULL,0,240,i) as a histogram in the lower panel but am getting no output

when i use just one iATR [i.e. iATR(NULL,0,240,i)] the histogram shows fine

am I doing something obvious wrong.

2. ultimately I would like to be able to color the histogram so that if the result of the calculation is below a certain level it would be one color and if above that level it woudl be a different color. Is it possible to code this in this software.

Thanks

You may be getting errors since atr can take 0 values so you cannot divide by zero
Try this
iATR(NULL,0,100,i)/(iATR(NULL,0,240,i)+0.0000000001) - it won't affect the calculation and will fix the issue

You cannot color code one signal. In MT4 you cannot change the color of a signal (It's possible in mt5)
You think that the indicators change color because you see them changing. Metatrader uses a trick, it uses 2 signals with different colors and shows one or the other - this is the way you get two colors.