I really have no idea what is being requested. What signal? Is P% just some sort of percent change or is it part of an indicator?

If you mean price is 40% below the price of the previous bar, that is going to be a pretty significant percent change.

100 * C <= 60 * C1

If you mean price is only 40% of the previous price that would be an even larger percent change.

100 * C <= 40 * C1

If you mean price is below 40% from the bottom of the range of the previous bar.

100 * C <= 40 * H1 + 60 * L1

If you mean price is at least 40% of the range of the previous bar below the close of the previous bar.

100 * C <= 100 * C1 - 40 * (H1 - L1)

If you mean something else, we would need further clarification as to the actual intent of the question.

I made a mistake, today the formula must generate the signal = <of 40% of the sum between the minimum value and yesterday's closing value (signal = <40% of yesterday's candle, from min to close).

So we must generate a signal if the current price is less the 40% up from the low to the close of the previous bar?

100 * C <= 60 * L1 + 40 * C1

Or the previous bar had the close in the bottom 40% of the bar?

STOC1.1.1 <= 40

The right formula should be today = <10% compared to the close value

Nothing about the low anymore? 10% of the previous close is just:

C1 / 10

So if today's price is less than or equal to 10% of the previous close.

C <= C1 / 10

If price just needs to have gone down by 10%:

C <= 9 * C1 / 10

But if we are back to less than 10% of the bottom of the range between the previous low and close.

10 * C <= 9 * L1 + C1

But if you mean below 10% from of the top of the range between the previous low and close.

10 * C <= L1 + 9 * C1

But seriously, if none of these are right, I've made 11 guesses so far. I'm not making any more without a better description. I have absolutely no idea what is being requested.

What exactly is the basis being used for the 10%? Is it the close? The range of the previous bar? The distance between the previous low and the previous close? Something else?

Does price need to be below 10% of the basis or does it need to be below some value (such as the previous close) minus the 10%? Or maybe it needs to be within 10% of something instead? Or something else entirely?

Yes, losing must be less than 10% (varies by choice) than yesterday's closing

So price is down, but by less than 10% of the close?

9 * C1 <= 10 * C AND C < C1

Or maybe price is down but by less than 10% of the distance between yesterday's close and low?

10 * C1 - H1 + L1 <= 10 * C AND C < C1

If neither of these is correct, then maybe we should start from the very beginning with a full and complete description of exactly what you want.

Signal => 10% compared to the opening value of yesterday, thank you in advance.

I don't know which formula actually worked for you, so I'll guess price is up but by less than 10% from the previous open?

O1 < C AND 10 * C <= 11 * O1

You're welcome.