Founder, Smart Electric Grid

Question

How to find out a smallest sub-matrix B from a sparse matrix A which has the equal rank and # of non-zero columns?

Dear All, I have a very sparse matrix A. I need to find out a number of rows (smallest #) of A which satisfies the following co...

7 days ago | 2 answers | 0

Question

How to find a shortest path from a node to a sub-network?

Dear All, I want to find out the shortest path from a given node to a sub-network in a graph. Thanks a lot in advance. Benso...

12 days ago | 1 answer | 0

Question

How to quickly update the inverse for a sparse matrix when a row changes?

Dear All, I have a square very sparse matrix A with a dimension 4000 by 4000, and I have its inverse InvA. Now a row in A chang...

3 months ago | 1 answer | 0

Question

How to check if a element of a struct is empty?

Dear All, I defined a struct and initialize it in the following way. Res_All_Meas = struct([]); [Res_All_Meas(1000).ind] = 0...

3 months ago | 2 answers | 0

Question

How to define a struct array with length more than one and assign values to one of the strucy array?

Dear All, I have a real array A. I want to define a struct array S to save the colculation reslut of element in A to the corres...

4 months ago | 2 answers | 0

Question

How to replace two columns in a txt file?

Dear All, I have a txt file which contains strings and numerical columns. Here are some samples of this txt file: 3 '...

4 months ago | 1 answer | 0

Question

How to read strings from a txt file?

Dear All, I need to read strings from a txt file which contains numerical data and strings. The file content is as follows: mo...

4 months ago | 1 answer | 0

Question

How to read a list of strings in a txt file?

Dear All, I need to read a txt file which contains a list of names with different lengths. Here is my txt file: mynames: OAKF...

4 months ago | 1 answer | 0

Question

An error of using fprintf

Dear All, When I tried to use fprintf to print numerical data and char in the same row, here is my code: fprintf(fileID, ' ...

4 months ago | 1 answer | 0

Question

Looking for the Source code of built in function ldl.m

Dear All, I am trying to use Matlab Coder to convert my Matlab code into C code. But there are a number of built in functions t...

5 months ago | 2 answers | 0

Question

How to plot a big network showing node ID?

Dear All, I used plot to display a bid network with 3000 nodes. But the graph does not show the node ID. I am wondering if it i...

5 months ago | 0 answers | 0

Question

How to generate a standalone application for Linux?

Dear All, I have a Matlab code. The user does not have Matlab and his platform is Linux not Windows. In order for the user to u...

6 months ago | 0 answers | 0

Question

Can I use web compiler to build a web demo for the users?

Dear All, I do not know if it is possible to use web compiler to build up a web demo for the users of our software. The users c...

6 months ago | 1 answer | 0

Question

Why is my exe file rejected to download and install in a business computer?

Dear All, I generated an exe file using Matlab compiler. I zipped it and sent the zipped package to a customer. But the custome...

6 months ago | 1 answer | 0

Question

How to solve this problem when my friend downloaded my standalone application?

Dear All, I used Matlab compiler to generate a standalone application package. I sent it to my friend to test. But he feedback...

7 months ago | 0 answers | 0

Question

Why did I get different print format in the output txt file?

Dear All, I used Matlab compiler to generate a standalone application exe file. I then tested it in 3 different computers. I ob...

7 months ago | 1 answer | 0

Question

How to get UTC time in my program?

Dear All, I am wondering if it is pissible to get the UTC time in my program. Do I need the internet avaibale if I want to get ...

7 months ago | 1 answer | 0

Question

Why the user was asked to install Matlab runtime for my standalone application?

Dear All, When I created a standalone application exe file, I used the selection "Runtime is included in the package". But the ...

7 months ago | 1 answer | 0

Question

Can I write a builtin Clock in my standalone application exe file?

Dear All, I am using the datetime to control the days the users can use our standalone application code. But I found a flaw of ...

7 months ago | 1 answer | 0

Question

How to delete the logo when using Matlab compiler?

Dear All, I want to delete the logo when using Matlab compiler. Would anyone know how to delete it? Thanks in advance. Benso...

7 months ago | 1 answer | 0

Question

How to write my Matlab code so that its standalone application program takes multiple input files?

Dear All, I want to design my standalone application code (.exe file generated by Matlab compiler) which takes input files as f...

7 months ago | 1 answer | 0

Question

How to find the absolution date?

Dear All, I think it is hard to find out the absolute date (current date). Because the computer date can be changed, for exampl...

8 months ago | 1 answer | 0

Question

How to print text in an existing txt file in an existing txt file?

Dear All, I tried the following cases: 1. fprintf('Hello <strong>bold</strong> world.\n') 2. fileID = fopen('GeneralResults.t...

9 months ago | 1 answer | 0

Question

How to print some text in a txt file in another folder?

Dear All, Hope this message finds you all being safe and healthy. I am trying to print some text and save them in a txt file ...

9 months ago | 3 answers | 0

Question

How to find a minimal number of rows in a sparse matrix to form a square sub-matrix for a given row?

Dear All, I have a big sparse matrix A. For a given row, is it possible for me to find the minimal number of rows in A to form ...

10 months ago | 1 answer | 1

Question

How to quickly find the column index of the last non-zero element in all rows in a sparse matrix?

Hi, All, I have a big sparse matrix A. I want to find out the column index of the Last non-zero element in all rows from the en...

10 months ago | 5 answers | 0

Question

How to quickly find the minimal number of rows in a sparse matrix to form a full-rank sub-matrix?

Dear All, I have a big sparse matrix A. For a given row, is it possible for me to find the minimal number of rows in A to form ...

10 months ago | 1 answer | 0

Question

How to quickly find the index of each integer in an ascend array?

Hi, All, I have an array which has an ascend integers. Now I want to find the index of the first integer in this array. For exa...

10 months ago | 1 answer | 0

Question

How to quickly find the first non-zero element without iterations in all columns in a sparse matrix?

Hi, All, I have a big sparse matrix A. I want to find out the first non-zero element in all columns from the top. Here is my co...

11 months ago | 4 answers | 0

Question

How to quickly find the maximum group of same rows in a matrix?

Dear All, I have a matrix and there exist identical rows in the matrix. I want to find the maximum group of identical rows in t...

1 year ago | 1 answer | 0