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Mastering Development

FiPy: Can I directly change faceVariables depending on neighboring cells?

I am working with a biological model of the distribution of microbial biomass (b1) on a 2D grid. From the biomass a protein (p1) is produced. The biomass diffuses over the grid, while the protein does not. Only if a certain amount of protein is produced (p > p_lim), the biomass is supposed to diffuse. […]

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Linux Mastering Development

Editing a file based on a pattern appearance

I have a file that contains text and numbers like this: state(1, s(1,a), [s(1,b)]). state(1, s(1,b), [s(1,a)]). state(1, s(2,a), [s(2,b)]). state(1, s(2,b), [s(2,a)]). state(1, s(3,a), [s(3,b)]). state(1, s(3,b), [s(3,a)]). state(1, s(4,a), [t(1), t(2)]). state(1, s(5,a), [t(1), t(3)]). state(1, s(6,a), [s(6,b)]). state(1, s(6,b), [s(6,a)]). …so on I want the numbering with in s(x,y) to change as […]

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Mastering Development

How to calculate the angles between each two successive lines in polygon

I tried to calculate the angles between each two successive lines in the polygon using the law of Cosines: $ cos(C) = \frac{a^2+b^2-c^2}{2ab} $, but I’m getting the Error: ValueError: math domain error, because the value of the cos obtained from that rule was out of range [-1, +1]. can you please advise me how […]

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Database Development

Prepared statement with parameters repeated multiple times throughout the query

I have a complex query issued via JDBC consisting of 2 string parameters and multiple SELECT statements, some of which nested. The same DB TABLE is queried multiple times and each query parameter is reused twice throughout the body. Looking at the JDBC driver logs I see that the 2 parameters (each of which appears […]

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Database Development

Prepared statement with parameters repeated multiple times throughout the query

I have a complex query issued via JDBC consisting of 2 string parameters and multiple SELECT statements, some of which nested. The same DB TABLE is queried multiple times and each query parameter is reused twice throughout the body. Looking at the JDBC driver logs I see that the 2 parameters (each of which appears […]

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User Help

RAID storage structure

I want to clarify with my understanding related to the RAID storage structure. I hope someone can guide me on this topic. First, let me show a picture of RAID system. [RAID][1][1]: https://i.stack.imgur.com/Whd6B.png. According to my understanding, each disk is partitioned into multiple strips. The encoding or decoding is done along a stripe, which is […]

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Mastering Development

Exception in thread “main” java.lang.ArrayIndexOutOfBoundsException: Index 1000 out of bounds for length 1000

I keep running into an issue with my implementation, I don’t know what’s wrong here. I tried modifying, and I even followed this: Stackoverflow with Quicksort Java implementation, but without success. public class Quicksort { public void sort(int[] a) { quicksort(a, 0, a.length – 1); } public static void quicksort(int[] a, int lo, int hi) […]

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Mastering Development

Creating a DatePicker from CDN with React API

I am importing some React modules from CDN (that’s not a requirement, I’ve also tried with a local build, more in the final question about it): <script crossorigin src="https://unpkg.com/react-onclickoutside@6.9.0/dist/react-onclickoutside.min.js"></script> <script crossorigin src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.29.0/moment.min.js" integrity="sha512-Izh34nqeeR7/nwthfeE0SI3c8uhFSnqxV0sI9TvTcXiFJkMd6fB644O64BRq2P/LA/+7eRvCw4GmLsXksyTHBg==" crossorigin="anonymous"></script> <script crossorigin src="https://unpkg.com/react-datepicker@3.1.3/dist/react-datepicker.min.js"></script> Then I have a script to build the React DatePicker component, this is the relevant snippet from it: […]

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Mastering Development

Returning values weighted according to some non-zero probability

I’m trying to implement a function that returns some predefined values with a particular probability. For people knowing Python’s NumPy module, I suppose I’m wondering whether there is an equivalent to numpy.random.choice() in JavaScript? If not, how else one could go about this efficiently? Here my code: // outcomes const max_outcome = 10; const min_outcome […]

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Mastering Development

How can I check if I have written a number or a letter in c++?

This is my first time on stackoverflow. I can not figure out how I can check if I have written a number or a letter. If i have written a letter I want the program to say that I neat to write a correct number. Everything is working except the part where the program asks […]