linear-algebra

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How to determine a semi-sphere's point x-y-z coordinates?

I\'m having serious problems solving a problem illustrated on the pic below. Let\'s say we have 3 points in 3D space (blue dots), and the some center of the triangle based on them (red dot - point P).[详细]

2023-03-08 05:25 分类：问答
Algorithm to get approximate equation of a graph based on a set of points [closed]

As it currently stands, this question is not a good fit for our Q&A format. We expect answers to be supported by facts, references,or expertise, but this question will likely solicit debate, a[详细]

2023-03-07 21:13 分类：问答
Working example of Principal Component Analysis? [closed]

Closed. This question does not meet Stack Overflow guidelines. It is not currently accepting answers.[详细]

2023-03-06 23:05 分类：问答
Linear algebra application in Machine Learning [closed]

Closed. This question does not meet Stack Overflow guidelines. It is not currently accepting answers.[详细]

2023-03-04 14:24 分类：问答
Python (NumPy, SciPy), finding the null space of a matrix

I\'m trying to find the null space (solution space of Ax=0) of a given matrix. I\'ve found two examples, but I can\'t seem to get either to work. Moreover, I can\'t understand what they\'re doing to g[详细]

2023-03-03 13:23 分类：问答
Does the basis of column space of a square matrix remains the same after squaring i.e is c(A)=c(AxA)?

Well I\'m working on matrices, and this thing is bugging me , though according to me it should be true because:[详细]

2023-03-02 16:14 分类：问答
pseudo inverse of sparse matrix in python

I am working with data from neuroimaging and because of the large amount of data, I would like to use sparse matrices for my code (scipy.sparse.lil_matrix or csr_matrix).[详细]

2023-03-02 12:20 分类：问答
Determining required vectors

I have an object that is aligned with the direction that I want the forces acting on its body\'s axis to move it in the direction of my camera\'s +z axis . Since the body is aligned where its local ax[详细]

2023-02-28 13:55 分类：问答
How does BLAS sgemm/dgemm work?

I am trying to make use of the function sgemm in BLAS using ctypes in python. Trying to solve C = A x B the following code works just fine:[详细]

2023-02-27 07:49 分类：问答
C: LU Complete Pivoting Decomposition and Matrix Solver; Something isn't right

I\'ve been working on a DIY linalg solver for a few days, and its coming together (no small things to you guys at stackexchange) But I\'m currently experiencing a Brain Fart and can\'t see what\'s wro[详细]

2023-02-26 15:27 分类：问答