How to plot scan the expression “Current bar is X% greater or lesser than previous bar”

Ok, so for reference I will point out the original question posted in the Chart Studies topic: https://www.hahn-tech.com/ans/how-to-identify-if-current-bar-is-above-or-below-a-certain-percentage/

We’ll be using the code I provided for that solution as a starting point:

declare lower;
def percentChange = 100 * (close / close[1] - 1);
plot data = percentChange;

I see from this current request you are asking for two different things. One is a custom scan to find stocks the a percentage change close-over-close greater than x percent. With the x being a user adjustable input. For simplicity, we will call that input “xPercent”. The second item you are requesting is a Chart Study. Probably a detail you meant to include in the original post. You want the chart study to paint the price bars a specified color when the close-over-close percentage change is greater than x percent.

The Scan:

input xPercent = 10.0;
def percentChange = 100 * (close / close[1] - 1);
plot scan = AbsValue(percentChange) > xPercent;

• notice we use AbsValue() function to convert negative values to positive

The Chart Study:

input xPercent = 10.0;
def percentChange = 100 * (close / close[1] - 1);
plot data = AbsValue(percentChange) > xPercent;
AssignPriceColor(if data then Color.MAGENTA else Color.GREEN);

Attached screenshot shows what the paint-bar study looks like. The scan code will pick up any Magenta colored bars occurring on the most recent bar on the chart.