# JFz

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**Content Feed**

Question

How does function std process complex numbers

In function S = std(A), there are complex numbers in matrix A. How does std calculate on complex numbers? Thanks

2 years ago | 2 answers | 0

### 2

answersQuestion

dir or ls are not working properly

Hi, I have a remote folder and there are many .mat files in it. I can see those files in windows explorer. But in matlab comma...

2 years ago | 1 answer | 0

### 1

answerQuestion

how to convert ,mat data file to R

Hi, I recently got a task to convert a .mat data file into an R datafile. I don't know how about R at all. So I am asking a...

3 years ago | 1 answer | 0

### 1

answerQuestion

Keep getting error: Failed to load the sqljdbc_auth.dll cause: no sqljdbc_auth in java.library.path

Hi, I created a standalone Matlab test app to access a SQL database using JDBC, and deployed it to a Windows 2012 server. But...

3 years ago | 0 answers | 0

### 0

answersQuestion

How to let server or deployed app know where to find DB driver?

Hi, I have a test app, only a few lines to just test the database connection and run a querry via database toolbox. I compiled ...

3 years ago | 1 answer | 0

### 1

answerQuestion

How to use splitApply to get the coefficients of fitlm?

Hi, I have a table dummyTable that I would like to findgroup and then splitApply. The function in the splitApply is fitlm. So...

3 years ago | 1 answer | 0

### 1

answerStrange problem with readtable

Just discovered that when I run the executable, and supply the file name, I cannot add a ";" at the end of the command.

3 years ago | 0

| accepted

Question

Strange problem with readtable

Hi, I wrote a small Matlan 2018a application and it runs smoothly. But after I compiled it into an executable and started to ru...

3 years ago | 1 answer | 0

### 1

answerNeed help with innerjoin where innerjoin returns more rows than necessary

Just found what's wrong here. Table B has same rows multiple times.

3 years ago | 0

| accepted

Question

Need help with innerjoin where innerjoin returns more rows than necessary

Hi, I am using innerjoin to join two tables A and B: C = innerjoin(A, B); A has 30 rows and B has 140 rows. After the join, th...

3 years ago | 1 answer | 0

### 1

answerQuestion

How to extract Jan and feb dates from an array of date strings?

Hi, I have an array of cells of date string. I need to extract all the dates in Jan and Feb. How to do that? Thanks a lot!

3 years ago | 2 answers | 0

### 2

answersQuestion

How to assign a number to an array of double?

Hi, I have an array of doubles a. It has integers from 0 to 6. I want to keep the 0s and 2s, but change all other numbers to ...

3 years ago | 1 answer | 0

### 1

answerQuestion

How to calculate regression with dummy variables?

Hi, I am trying to use 2nd degree polynomial regression with dummy variables. Which function should I use? Thanks for any he...

3 years ago | 1 answer | 0

### 1

answerreadtable error "Sheet name does not exist or is not supported"

Thanks for the help. I just fixed it! Some the date format in the sheet is not readable in Matlab. I changed the Date format ...

3 years ago | 0

| accepted

Question

readtable error "Sheet name does not exist or is not supported"

Hi, I use readtable all the time but never had this error until today: "Sheet name does not exist or is not supported, To ch...

3 years ago | 1 answer | 0

### 1

answerQuestion

How to replace nan with the mean of the four numbers surrounding it?

Hi, I have a large matrix and there are nan in it. Sometimes a whole row is a nan. How to replace nan with the mean of the ...

3 years ago | 1 answer | 0

### 1

answerQuestion

How to convert a cell array of datetime to an array of datetime

Hi, Is there a simple way to convert a cell array of datetime to an array of datetime without using cellfun? My cell array loo...

3 years ago | 1 answer | 0

### 1

answerQuestion

Error when fastinsert a table into DB vs no error if inserting only one row

Recently upgraded from 2016a to 2018a. Got an error in fastinsert. But if I insert only one row, there is no problem. Here is th...

3 years ago | 0 answers | 0

### 0

answersQuestion

MATLAB 2018a error: Error using actxserver:

Hi, My script that connecting Matlab and Power World is not working after migrated to 2018a. Here is the error: Server cre...

3 years ago | 1 answer | 0

### 1

answerQuestion

How to find out the Proxy Server and port when compiling and installing magicsqaure?

Hi, I am testing the magicsqaure compiling and installing. I can compile without problem. But when installing, it needs Proxy S...

3 years ago | 0 answers | 0

### 0

answersQuestion

Got error in compiling standalone app 2018a

Hi, I am compiling a simple matlab file and got this error: Compiler version: 6.6 (R2018a) Dependency analysis by REQUI...

3 years ago | 2 answers | 0

### 2

answersQuestion

In classdef, how to call a static method from an other class P.c.averages()?

Hi, I am moving to 2018a from 2016a and found this error: External converter methods for package-qualified classes not suppo...

3 years ago | 0 answers | 0

### 0

answersQuestion

Error in 2018a: External converter methods for package-qualified classes not supported

Hi, My code (running perfectly in 2016a) cannot run in 2018a due to an error: External converter methods for package-qualifi...

3 years ago | 1 answer | 0

### 1

answerdeploytool error when trying to build an exe-file with 2016a

I have the license but didn't install it. How to install the compiler? Thanks.

3 years ago | 0

Question

deploytool error when trying to build an exe-file with 2016a

Hi, I have purchased the license of Matlab compiler SDK. But when I type deploytool in the command window, I get this error:...

3 years ago | 2 answers | 0

### 2

answersQuestion

How to copy an object that is not a graphic one?

Hi, I have an object of a class which I defined. I would like to make a copy of that object. But copy or copyobj do not seem ...

3 years ago | 2 answers | 0

### 2

answersQuestion

How to concatenate an array of numbers without for loop

Hi, I have an array of integer numbers A = [1, 2, 3]. I would like to concatenate the numbers for use in SQL statement like '(...

3 years ago | 2 answers | 0

### 2

answersQuestion

Splitapply on a matrix of 1X1000

I have a matrix of 1x1000 numbers and my G is 1. When I do the splitapply on it: res = splitapply(@sum, mat, G); The res Is...

3 years ago | 1 answer | 0

### 1

answerQuestion

Problem with print function

Hi, I use print('-f1', filename, '-djpeg') to save a figure into a remote drive and it worked as a charm yesterday. But fo...

4 years ago | 0 answers | 0

### 0

answersQuestion

Calculate R squared from a linear regress

Hi, I have a set of scattered data and I can use the operator "\" to do a linear fit on the data. But is there a simple matl...

4 years ago | 1 answer | 0