linear-algebra

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UMFPACK and BOOST's uBLAS Sparse Matrix

I am using Boost\'s uBLAS in a numerical code and have a \'heavy\' solver in place: http://www.crystalclearsoftware.com/cgi-bin/boost_wiki/wiki.pl?LU_Matrix_Inversion[详细]

2023-01-21 07:17 分类：问答
Good Linear Algebra Package [closed]

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

2023-01-20 19:47 分类：问答
PDF calculate Glyph sizes

I (think) have every values for Text-Rendering in a PDF. * Position (Text Matrix) * FontDescriptor with Widths Array[详细]

2023-01-20 19:07 分类：问答
Finding bounds for 21-variable inequalities

I have the following inequalities on 21 variables: http://pastebin.com/raw.php?i=FTU970Em When I run \"Reduce[ineq,Integers]\" on this, Mathematica hangs for a[详细]

2023-01-18 05:00 分类：问答
T and R estimation from essential matrix

I created a simple test appl开发者_运维知识库ication to perform translation (T) and rotation (R) estimation fromthe essential matrix.[详细]

2023-01-15 06:15 分类：问答
How to see scaling matrices from a geometric perspective

I\'m using XNA but it doesn\'t matter too much for this example. So let\'s say I have a sprite. I then apply a scaling matrix before anything. Is the scaling matrix applied scaling the local axis of t[详细]

2023-01-15 06:07 分类：问答
LU decomposition with row pivot

The following function does not use row pivoting for LU decomposition. Is there an existi开发者_如何学Pythonng function in R that does LU decomposition with row pivot?[详细]

2023-01-14 16:12 分类：问答
Multivariate Bisection Method

I need an algorithm to perform a 2D bisection method for solving a 2x2 non-linear problem. Example: two equations f(x,y)=0 and g(x,y)=0 which I want to solve simultaneously. I am very familiar with th[详细]

2023-01-12 15:59 分类：问答
Obtaining an invertible square matrix from a non-square matrix of full rank in numpy or matlab

Assume you have an NxM matrix A of full rank, where M>N. If we denote the columns by C_i (with dimensions Nx1), then we can write the matrix as[详细]

2023-01-12 08:16 分类：问答
eigenvectors when A-lx is singular with no solution

How is R able to find eigenvectors for the following matrix? Eigenvalues are 2,2 so eigenvectors require solving solve(matrix(c(0,1,0,0),2,2)) which is singular matrix with no solution.[详细]

2023-01-11 02:40 分类：问答