Community Profile

photo

Simon


Last seen: alrededor de 2 meses hace Con actividad desde 2022

Estadísticas

All
  • Thankful Level 4
  • Solver
  • First Answer

Ver insignias

Content Feed

Ver por

Pregunta


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...

alrededor de 2 meses hace | 1 respuesta | 0

1

respuesta

Pregunta


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...

6 meses hace | 0 respuestas | 0

0

respuestas

Pregunta


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...

7 meses hace | 2 respuestas | 0

2

respuestas

Pregunta


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', ',...

7 meses hace | 1 respuesta | 0

1

respuesta

Respondida
What should go in a next-generation MATLAB X?
Insert 'parfor' option into splitapply( ), grouptransform( ) or create separate parallel versions of those two functions. Righ...

7 meses hace | 0

Respondida
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...

7 meses hace | 0

Respondida
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...

7 meses hace | 0

Pregunta


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...

7 meses hace | 2 respuestas | 0

2

respuestas

Respondida
What 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...

7 meses hace | 0

Pregunta


(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...

7 meses hace | 1 respuesta | 1

1

respuesta

Respondida
(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) ...

8 meses hace | 0

| aceptada

Pregunta


(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 ...

8 meses hace | 1 respuesta | 0

1

respuesta

Respondida
(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...

9 meses hace | 0

Pregunta


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...

9 meses hace | 0 respuestas | 0

0

respuestas

Pregunta


(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 ...

9 meses hace | 3 respuestas | 0

3

respuestas

Pregunta


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...

9 meses hace | 1 respuesta | 0

1

respuesta

Pregunta


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...

10 meses hace | 1 respuesta | 0

1

respuesta

Pregunta


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...

11 meses hace | 1 respuesta | 0

1

respuesta

Respondida
Storing 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...

11 meses hace | 0

Pregunta


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...

11 meses hace | 4 respuestas | 0

4

respuestas

Pregunta


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...

12 meses hace | 2 respuestas | 0

2

respuestas

Pregunta


Edit: sqlwrite( ) fails when integer variable's value range is set too small.
Edit: previous wrong undestanding: "sqlwrite( ) fails to save a tall table to MySQL (native connection mode), when the number o...

alrededor de 1 año hace | 1 respuesta | 0

1

respuesta

Respondida
Unable to connect to MySQL (native data source configuration) on iMac
After I upgrade Matlab to 2023a, this problem is gone. I now can connect to MySQL server with "native" mode. Thanks to Mathwork...

alrededor de 1 año hace | 0

| aceptada

Pregunta


Why is parfor-loop is much slower than for-loop in this case?
I just started to explore the pros and cons of parfor-loop. In the simpy testing codes below, parfor-loop is much slower than fo...

alrededor de 1 año hace | 1 respuesta | 0

1

respuesta

Pregunta


How to include a wide table's VariableDescriptions as an additiolnal column when stacking the table?
I would like to make a wide table's VariableDescriptions as an additional column when I stack the table. I have written some cod...

alrededor de 1 año hace | 1 respuesta | 0

1

respuesta

Pregunta


Live editor's new panel is just blank when another live script is open
I just started using Live Script more often recently and loved it. But when a couple live scripts are being edited, Matlab Live ...

alrededor de 1 año hace | 1 respuesta | 0

1

respuesta

Pregunta


How to suppress "Warning: ATTR will be removed in a future release" when update( ) MySQL?
Everytime I use the update( ) function to update a row in a MySQL table, the warning message is displayed Warning: ATTR will be...

alrededor de 1 año hace | 1 respuesta | 0

1

respuesta

Pregunta


How to modify the built-in 'fetch' function so that it can select columns flexibly?
I was trying to write a function which fetch only the columns I like from a MySQL table. easy_fetch(conn, 'mytable', 'A', 'B') ...

más de 1 año hace | 1 respuesta | 0

1

respuesta

Pregunta


How should XPath be set in TableSelector for htmlImportOptions so readtable( ) can output the first three tables in an html file?
I like to read first three tables in an html file with calling readtable( ) once in order to reduce the html file reading ti...

más de 1 año hace | 2 respuestas | 0

2

respuestas

Pregunta


How can my code, which collects bad data with 'cellfun' and 'try, catch', be improved?
My real situatoin is that I have a large number of files. Some I suspect are bad. I want to know the file names of all the bad f...

más de 1 año hace | 1 respuesta | 0

1

respuesta

Cargar más