Question

How to quickly combine some lines in a network?

Dear All, For a given network formed by edges and lines, I want to combine some lines in this network to generate a new netwo...

mehr als ein Jahr ago | 0 answers | 0

Question

Looking for all sub-networks among a network

Dear All, For a given network formed by lines and edges, how can I quickly find out all sub-networks? There is no connection ...

mehr als ein Jahr ago | 1 answer | 0

Question

How to solve this weird problem in Matlab?

Dear all, I have a linear equation: a*x1-b*x2+x3=1.0. a and b are known parameters: a=b=10E+6. Now we know the solutions of x...

mehr als ein Jahr ago | 2 answers | 0

Question

Faster approach of LU decomposition for a symmetric sparse matrix than lu in Matlab?

Dear All, I have a symmetric sparse matrix A. I want to obtain its LU decomposition. But I found lu(A) took me about 1 second...

mehr als ein Jahr ago | 1 answer | 0

Question

Faster inverse of a lower triangular matrix than inv(A)?

Dear All, I have a sparse lower triangular matrix A. I want to obtain the inverse of A. A has a size of 6000 X 6000. I find i...

mehr als ein Jahr ago | 2 answers | 0

Question

How to assign values to a sparse matrix without iterations?

Hi, All, I want to assign non-zero values to a matrix H. I know the locations of all the non-zeros. For example, I know the n...

mehr als ein Jahr ago | 2 answers | 0

Question

How to specifically select columns from a matrix?

Dear All, For a given 2 columns matrix A. For example <</matlabcentral/answers/uploaded_files/135120/Screen%20Shot%202018-...

fast 2 Jahre ago | 1 answer | 0

Question

Semi-Lower Triangular Matrix

Dear All, I want to convert a general sparse matrix into a semi-lower triangular matrix. For example, a given matrix A: A=...

fast 2 Jahre ago | 0 answers | 1

Question

A challenging problem: how to obtain a semi-lower triangular matrix from a general matrix?

Dear All, I want to convert a general sparse matrix into a semi-lower triangular matrix. For example, a given matrix A: A=...

fast 2 Jahre ago | 1 answer | 1

Question

Error caused by that small difference between two number is divided by a very small number

We have a situation that the difference between two complex numbers is divided by a very small complex number. For example, the ...

fast 2 Jahre ago | 0 answers | 0

Question

Does Orthogonal Matching Pursuit have the problem of divergence?

I am using the Matlab code of OMP to solve a nonlinear problem. But I do not now if OMP has the problem of divergence. As to my ...

mehr als 2 Jahre ago | 0 answers | 0

Question

Can I use L1-Optimization to estimate a linear set of equations?

I have a linear equation Bx=P. Where B is an overdetermined matrix (M x N, M > N), x is a variable column vector, and P is the m...

etwa 3 Jahre ago | 0 answers | 0