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Question

How to rewrite this high dimensional matrix calculation

Here is the code: X = randn(A,B,C); Z = zeros(A,B,A,B,C); for a=1:A for b=1:B Z(a,b,:,:,:) = X - X(a,b,:); ...

27 days ago | 2 answers | 0

### 2

answersQuestion

How to accelerate the running speed of this code?

function [ S ] = fun(X,A,B,C) %% obtain S from X %% the size of X is A*B*C S = zeros(A,B,C); for a = 1:A fo...

28 days ago | 1 answer | 0

### 1

answerQuestion

A numerical calculation problem leading to Inf or NaN in matlab

I want to calculate the exact value of , where and is a very large positive number. Obviously, we have the bound ,and therefor...

4 months ago | 2 answers | 0

### 2

answersQuestion

How to fastly calculate this matrix operation

A matrix is a dimensional matrix, is a dimensional vector, is a dimensional matrix, is a constant. How to fastly calcula...

4 months ago | 1 answer | 0

### 1

answerQuestion

The product of a vector and a matrix

I have a vector A = and a matrix X = , where is a M-dimensional row vector. Does matlab have an operator that directly give m...

11 months ago | 1 answer | 0

### 1

answerQuestion

Matlab solver for unconstrained convex optimization

I have a large scale unconstrained convex optimization problem as follows min , where and are N-dimensional vectors, is a sc...

11 months ago | 1 answer | 0

### 1

answerQuestion

Optimization problem using fminunc

I have an optimization problem where x is a N-dimensional vector need to be optimized and a1,...,a5 are parameters. I have w...

11 months ago | 1 answer | 0

### 1

answerQuestion

How to efficiently calculate a weighted sum of 3 dimensional matrix through a vector in matlab

A is a 3 dimensional matrix (M*N*K), b is a vector with length K. I need to calculate , which is a 2 dimensional matrix (M*N)....

12 months ago | 2 answers | 0

### 2

answersQuestion

quadprog is too slow for a convex unconstrained quadratic problem

My algorithm contains solving a unconstrained quadratic problem. f(x) = 1/2*x'*A*x+b'*x, where A is a positive semidefinite matr...

12 months ago | 1 answer | 0

### 1

answerQuestion

CVX optimization of semidefinite relaxation (SDR) with complex matrix

I need to optimize the following semidefinite relaxation problem Here is my code with CVX tool where N is the size of matr...

2 years ago | 1 answer | 0