# Hung Dao

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Question

chol() returns error even the matrix is positive definite.

I have a matrix , where is a identity matrix and is a matrix. It is clear that M is a positive definite matrix. However, I a...

2 months ago | 2 answers | 0

### 2

answersQuestion

Plot overlapped points (Matlab 2020a)

Hi, I have a scatter plot (see the picture and code below) comparing the true values with the estimation results from 3 methods...

1 year ago | 3 answers | 0

### 3

answersQuestion

How to duplicate rows of a matrix if the number of copies for each row are different?

Hi all, I want to duplicate each rows of a matrix according to the numbers given in a vector. For example, I have matrix A and...

1 year ago | 3 answers | 0

### 3

answersQuestion

How to get the smallest value in submatrices

Hi, I would appreciate if you could help me with this problem. I have a big matrix , where are submatrices of the same size...

1 year ago | 2 answers | 0

### 2

answersQuestion

How to add each column of matrix A with another matrix B?

Suppose is a column vector and is a matrix, then , a matrix. Now, I have matrix , each is a column vector. I would like ...

2 years ago | 1 answer | 0

### 1

answerQuestion

Save data when an error occurs inside a function.

Hi, I have an algorithm (called algorithm A) that takes hours to run. Algorithm A is written in a script file 'Algorithm_A.m'. ...

2 years ago | 1 answer | 0

### 1

answerQuestion

An efficient way to compute many sums with different number of terms

Suppose I have 2 functions and . Given different values of , define and ...

2 years ago | 1 answer | 0

### 1

answerQuestion

How to efficiently compute a sum of large vectors with elements depend on the sum index?

I have to compute the sum: , where are large column vectors ( dimension is about 10 millions) and is about 100 to 200. My fir...

2 years ago | 1 answer | 0