Let $ A$ be a $ n\times n$ real matrix. Is there a vector $ \vec x \in \mathbb{R}^n$ with exactly $ 0 \le k < n$ zero entries such that $ A \vec x = 0$ ? Is there an efficient algorithm to tackle this question?Read more
Let $ A$ be a $ n\times n$ real matrix. Is there a vector $ \vec x \in \mathbb{R}^n$ with exactly $ 0 \le k < n$ zero entries such that $ A \vec x = 0$ ? Is there an efficient algorithm to tackle this question?Read more
Hi, I will do Data Entry work of 1000 entries in just 24 hours. I know that: Delivery of Data Entry work within the time is very difficult but I am very confident to deliver you within the deadline. Because: 1. I am working in this field since 2015. I am experienced. 2. I haveRead more
My girlfriend had applied a standard visitor visa last year and her stated reason was tourism. Is it OK for her to visit me now, as it’s now for a different reason?Read more
Suppose I have a symmetric $ 2$ by $ 2$ matrix $ M$ whose $ (i,j)$ -th entry $ F_{i,j}(\mathbf{x})$ belongs to $ \mathbb{R}[x_1, \ldots, x_n]$ for each $ i,j$ . I know that for each $ \mathbf{x} \in \mathbb{R}^n$ , we can find an orthogonal matrix which diagonalises $ M$ . I was wonderingRead more
I have a nasty (IMO) piece of code for a datatable configuration, how do i best remove the duplication here? I’ve tried the obvious things I know (collapsing into one statement and trying inline conditionals) but it isn’t working and I can’t help thinking there must be a more elegant Ruby way here. if show_statusRead more
Need to create a calculated field that looks for the presence of an item not in a list (even if other named values are selected). The field will be used to create a view that presents items that have the ‘Specify your own value’ field within the selections from a multi-value choice column. I haveRead more
I am beginner in mathematica. I have the following question: Assume we have a matrix and some of its entries are nonzero and we know which one are. But the nonzero entries can be three different values and we want to calculate the determinant of the matrix for all different cases. How can I doRead more
Below are a couple of idle questions that came up one day when I became curious about “matrix factorizations over $ \mathbb Z$ “. Let’s start with size $ 2$ : consider the equation $ n= ab-cd$ (*), where $ n$ is an integer, and $ a,b,c,d$ are prime number. Question 1: does the equationRead more
I have three columns f1, f2 and f3 f1 f2 f3 1 3 5 5 7 3 … My goal is to select those entries where the relationship of f1:f2:f3 is roughly(+-2) number1:number2:number3 Example: SELECT those rows where the relationship is roughly 5:7:4 -> Result 5 7 3. What does the SELECT command look like?Read more
I want to know, what is the correct way to implement CRUD operations in Magento 2? because I found a lot of examples but they use deprecated methods.Read more