$\begingroup$ $|s|$ usually refers to the Euclidean length of the vector, i.e., $\sqrt{s_1+s_2+\dots+s_d}$, where $d$ is the dimensionality of the vector (4 in your case). So …

The length of a vector is always a measure of the number of entries, while the index of the last element is a function of the ORIGIN variable. To get the Euclidean length of v, use the …

Dec 18, 2009 · How can I count the number of elements in a vector that fall within a particular range using r?

Vectors can be specified using either ordered pair notation (a subset of ordered set notation using only two components), or matrix notation, as with rectangular coordinates. In these forms, the …

5 days ago · I find it helpful to use \(a^x\) as the scalar value of a vector \(\b{a}\)’s \(\b{x}\) component, and to use \(\b{a}^x\) as a vector value, as \[\b{a}^x = a^x \b{x} = (a \cdot x) \b{x}\] …

Jun 1, 2022 · I am sure that |v_i| is the general notation for the actual length in the euclidean space. v_i represents for different i, vectors with a different number of components. How do I …

Vector Notation Overview An arrow over a variable indicates it is a vector. F~net = m~a (1) The magnitude of the vector is indicated by either Fnet (no arrow drawn) or jF~netj (absolute value …

Apr 25, 2020 · I'm looking for a way to write the number of components/coordinates in the vector. Something like $\dim(\mathbf{\theta}) = 3$ . However, as I understand it, 'dim' is usually used …

Oct 8, 2018 · I have a column vector with two 1's and n 2's, where n is an integer. What is a clever way of denoting that there are n 2's in the matrix? I was thinking of using like a side brace, but …

Jul 2, 2014 · How to return the number of elements of a vector variable in C++. With the std::vector::size() member function: std::vector<std::string> v; v.push_back("Hello, World!"); …