2
votes
1answer
82 views

Solving a system of Differential Equations with RREF'ed Matrix

Is there a way to solve for example: Where $D$ is the differential operator. $$(D-4)x + D^2y = 0$$ $$(D+1)x + Dy = 0$$ Without the operator $$x' - 4x + y'' = 0$$ $$x' + 1x + y' = 0$$ Using a ...
0
votes
1answer
2k views

Finding matrix inverse by Gaussian Elimination With Partial Pivoting

Hello guys I am writing program to compute determinant(this part i already did) and Inverse matrix with GEPP. Here problem arises since i have completely no idea how to inverse Matrix using GEPP, i ...
1
vote
2answers
124 views

Computing positive semidefinite (PSD) rank with mathematical software

I would like find positive semidefinite (PSD) rank or a decomposition for 10~15 size square nonnegative matrices with the aid of some mathematical software. I wonder if it is feasible with standard ...
3
votes
1answer
79 views

Find the smallest square matrix in which some objects fit following some rules

I have to put some objects in a matrix. The data of these objects is given in another matrix in which each line contains an object, and the first column represents its width, and the second its ...
38
votes
14answers
2k views

'Linux' math program with interactive terminal?

Are there any open source math programs out there that have an interactive terminal and that work on linux? So for example you could enter two matrices and specify an operation such as multiply and ...
2
votes
1answer
358 views

MATLAB Fermi-Pasta-Ulam lattice model can't force periodic boundary condition

I am building MATLAB code to implement a symplectic integrator using a second order split-step method for the Fermi-Pasta-Ulam problem. The Hamiltonian is in the form: H = sum from i=1 to N ...
-1
votes
1answer
115 views

What is this unary matrix operation called?

I have the folowing problem! $B \cdot \overline{X} = C$ where $B$ is $(12 \times 12)$ matrix and $C$ is $(12 \times 4)$. $X$ is unknown. What does $\overline X$ mean? Also I need to solve this in ...
1
vote
1answer
524 views

How to minimize matrix function in MathCAD?

I'm new to mathcad and i'm experiencing problems with using it. I need to minimize my function Trr(Rr), where Rr is matrix with ...
5
votes
1answer
202 views

FLOSS tool to visualize 2- and 3-space matrix transformations

I'm looking for a FLOSS application (Windows or Ubuntu but preferably both) that can help me visualize matrix transformations in 2- and 3-space. So I'd like to be able to enter a vector or matrix, ...
1
vote
1answer
487 views

Does MATLAB take care of sparsity itself?

Suppose i have matrix of size 1000*1000 with 70% sparsity. I am performing some multiplication, inverse operations upon it. While making calculations, does MATLAB make checks to see if matrix is ...
1
vote
2answers
495 views

Exporting a matrix in Mathematica in curly brackets format

I am trying to export a matrix in a file using Mathematica. I get the matrix and then use Export["myfile.dat", MyMatrix, "???Format???"] There are many formats. ...
1
vote
3answers
159 views

Good computer programs for dealing with sparse matrices

I'm looking for some FOSS/GPL programs (or Python libraries) for dealing with sparse matrices. I haven't found much online about these. Can someone please point me in the right direction?