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I'm trying to write a program in C that reads in a positive integer of up to 20 digits. It should output the smallest palindromic number that is higher than the input. A palindromic number is one that is the same when its digits are reversed (e.g, 98789 is a palindrome, 12344321 is a palindrome, 12345 is not a palindrome as it becomes 54321 when reversed). A sample run, for example, would take 17 as an input and output 22. However, when I run the program and place an input, a segmentation fault: 11 error occurs. Please note that I'm not an experienced programmer, so the code might seem ugly:

I'm trying to add a GUI to the predator-prey simulation. It can allow users to choose which simulation(species involved) they want to do, set the simulation field size they want, and show the progress of the simulation and result.

I asked a question before, and I kinda figure it out what caused the problem.

But now I encounter another question:

How do I let the simulation buttons use the same object method which generate button use, but also don't generate the field again?

As the code shown below,

(1)after I generate the field and press "Reset" button, it will generate the field again then reset simulation(show up a new field window with different data);

(2)after I generate the field and press "Next step" button, it will generate the field again then show next step simulation(show up a new field window and don't inherit the initial data I generate);

(3)after I generate the field and press "long run step" button, it will generate the field again then show next hundred step simulation result(show up a new field window and don't inherit the initial data I generate and don't show the progress);

I'm trying to add a GUI to the predator-prey simulation. It can allow users to choose which simulation(species involved) they want to do, set the simulation field size they want, and show the progress of the simulation and result.

The question is after I generate the field, I can't reset the simulation or run the next step or run the next hundred steps by clicking the buttons I set, not to mention show the progress of the simulation.

Here is the code of my GUI Class:

My strategy looks like this:

I have been working on a pine editor script that is supposed to place a long order when the prior candle closing price (and current price) is above "Lead Line 1" and "Lead Line 2" of the Ichimoku Cloud indicator, and a short order when the prior candle closing price (and current price) is below both of the lines. Additionally, when an order is placed a stop loss should be placed either 2x the ATR above (for short positions) or below (for long positions) the entry price. This is shown visually by a trailing line above and below the candles. The take profit should be 1.5x the difference between the stop loss and entry price.

As you will see from my screen shots the long and short entries seem to be taken anywhere, and I am not too sure that the stop loss and take profit functions are working correctly either.

This picture shows a long position being taken both within the cloud and under the cloud (both of which I do not want)

This picture shows a short position being taken above the cloud, which also should not happen.

Does anyone have a solution to this problem? I will attach my code, but I will greatly appreciate any help or advice you can give.

I'm currently in the process of upgrading a few projects from Java 8 to Java 11 where one of the unit tests for a converter failed. Basically the problem stems from the equality check failing due to a a date precision which previously passed with JDK 8.

Here's a section sample of the test, I've moved the contents of the converter for clarity:

I'm reading PineCoders' FAQ and more precisely how to optimize the code. I want to replace valuewhen in the following scenario. I assume they mentioned it because of the warning about repainting when creating alerts?

Use techniques like this one whenever you can, to avoid using valuewhen().

How should I avoid valuewhen in the following case?

I'm trying to accomplish trade direction (Long/Short/Both) in study mode, just like LucF and PineCoders did here.

• When I select "Longs Only", I expect it to show only long trades, but it doesn't due to the missing the part which finds the range of the candles in the long trade. If you check the link I gave above (Backtesting & Trading Engine [PineCoders]), LucF uses InLong, InShort, InTrade variables. The problem is that his code is older and too overengineered for me and I don't get the idea on how to recreate it.

I said overengineered, because his code includes pyramiding, slippage and other stuff that are now built-in TradingView, probably because back in 2019, PineScript didn't have such features.

The actual idea behind that indicator is to plot alerts and another script which backtests it using that indicator as a source.

• The bar coloring part is not working and it is currently commented, so the code can compile. The problem is the same as above's description. I need to know whether I'm in a long trade direction or short or not in a trade at all. I don't know how to accomplish that part.

hope you're all fine.

That's my first question, so I'm sorry if something's not right about it.

I'm studying numerical stability and chaoticity of some dynamical systems, more specifically, about the Circular Restricted Three Body Problem (CR3BP), defined by the set of 3 second order differential equations. After transforming those three second order differential equations in six first order differential equations as seen here i can finally finally work with them numerically using scipy's ODEINT. Here's an example of an orbit integrated for T = 2^10 with n = 2^18 points (np.linspace(1, 2^10, 2^18)) and here's a bit of my code for this, the main function to be integrated: