# Simon

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Question

my license for database toolbox isn’t linked to mobile Matlab

I have bought the license of Database Toolbox and it wotks fine in Mac. When I try to connect with an sqlite .db file in the iPa...

1 month ago | 0 answers | 0

### 0

answersQuestion

sqlite ignore project path?

I have a sqlite database, say "filename.db", in a local folder (MacOS). The folder is then added to my project path. However, sq...

1 month ago | 1 answer | 0

### 1

answerQuestion

How to select non-string variables convertvars( ) argument?

I want to convert non-string variables to string using convertvars. I can do convertvars(T, @isnumeric, 'string') and convertvar...

5 months ago | 1 answer | 0

### 1

answerQuestion

What is the best folder organization for a large data analysis project with multilayered subprojects?

My project involves several subprojects. They should be completed in a sequential manner. And each subproject involves different...

9 months ago | 0 answers | 0

### 0

answersQuestion

Is there a parallel version of splitapply()?

Group-based computation is naturally sutiable for parallel computation. I wonder why Matlab has not yet a built-in parfor-splita...

9 months ago | 2 answers | 0

### 2

answersQuestion

readtable(html file) producing extra empty columns

Original question: In another thread, similar question was asked for readtable(csv file). The answer was to set {'delimiter', ',...

9 months ago | 1 answer | 0

### 1

answerWhat should go in a next-generation MATLAB X?

Insert 'parfor' option into splitapply( ), grouptransform( ) or create separate parallel versions of those two functions. Righ...

10 months ago | 0

What should go in a next-generation MATLAB X?

@Andrew Janke Do you cast your table variables to categorical? In my case, if a task is to process strings, it will be many-time...

10 months ago | 0

What should go in a next-generation MATLAB X?

My wish list, not about code improvement but about official tutorials. a tutorial of using splitapply to take advantage of para...

10 months ago | 0

Question

Why doesn't parfeval(@splitapply) improve splitapply's performance?

I want to readtable many html-files to extract tables. I wrote a function extract_sheet to do just that. I had used parfor to pe...

10 months ago | 2 answers | 0

### 2

answersWhat should go in a next-generation MATLAB X?

Better folder path utility. Python's pathlib is powerful and very intuitive to use. Matlab's dir is cumbersome. To be the proble...

10 months ago | 0

Question

(par)for k=1:N end; select for or parfor loop without code replication

I like to use for-loop or parfor-loop with function input flag. One way to do that is using if-else with code replication. I won...

10 months ago | 1 answer | 1

### 1

answerSolved

Getting the indices from a vector

This is a basic MATLAB operation. It is for instructional purposes. --- You may already know how to <http://www.mathworks....

10 months ago

Solved

Find Air Temperature from Cricket Stridulation Rate

Stridulation is the process that creates a cricket's “chirp” by rubbing their wings or legs. According to the Old Farmer's Alma...

10 months ago

Solved

Get the length of a given vector

Given a vector x, the output y should equal the length of x.

10 months ago

Solved

Select every other element of a vector

Write a function which returns every other element of the vector passed in. That is, it returns the all odd-numbered elements, s...

10 months ago

Solved

Find the sum of all the numbers of the input vector

Find the sum of all the numbers of the input vector x. Examples: Input x = [1 2 3 5] Output y is 11 Input x ...

10 months ago

(revised) What is the right way to apply parallel.pool.Constant on functional handle?

I think I found the solution: feval(). It's in the help page of broadcast variable and parfor. function res = iter_test(f, T) ...

11 months ago | 0

| accepted

Question

(revised) What is the right way to apply parallel.pool.Constant on functional handle?

(original question) I use parfor-loop to process through rows of table/array. In each iteration, a function handle is called to ...

11 months ago | 1 answer | 0

### 1

answer(problem solved, question revised) How to select table rows with varargin and not using logical condition as input argument.

@Steven Lord I think I finally figure out how to do it based on your algorithm. Great thanks for your generous help. I think the...

12 months ago | 0

Question

How to write one universal function to evaluate many equations?

I am working on verifying whether if equations are valid over a large data set. The challenge is that the number of equations to...

12 months ago | 0 answers | 0

### 0

answersQuestion

(problem solved, question revised) How to select table rows with varargin and not using logical condition as input argument.

(original question)"I have tables. Selecting rows where values meet logical conditions from them is a frequent task. It becomes ...

12 months ago | 3 answers | 0

### 3

answersQuestion

a philosophical question regarding function (how many tasks should be wrapped inside a function?)

My data have two types of tables. They share common columns, and the second type has extra columns. I couldn't decide whether i...

1 year ago | 1 answer | 0

### 1

answerQuestion

What toolboxes should I get to do speech formant analysis in real time?

I want to record speech sound with a mucrophone, and have its formants analyzed and displayed in real time. Hopefully the spectr...

1 year ago | 1 answer | 0

### 1

answerQuestion

Is there a less bug-prone way to include quote in selector string variable when defining opt.TableSelector?

My situation is to readtable( ) several tables, each of which has a specific title, from an html file. I have come up with a co...

1 year ago | 1 answer | 0

### 1

answerStoring a .mat file in mysql database

In my own experience I have tried three different approaches to store tables in MySQL. I also use Workbench (UI for MySQL comman...

1 year ago | 0

Question

How to access data of regexp output (without temporary variable)?

I know how to convert the output from regexp( ) to a table by intermediating through a temporary variable as this solution: str...

1 year ago | 4 answers | 0

### 4

answersQuestion

use unstack to reshape table with dummy variable (edited: alternative crosstab method)

After I sort table according to a group variable, I like to put the group value as the 'header' column and put its members in th...

1 year ago | 2 answers | 0