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Simon


Last seen: 25 days 前 |  自 2022 起处于活动状态

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Functional programming and idea-oriented Git branching strategy
I analyze a set of financial statement data. The end output of this project should be a short list of stocks for investment, not...

3 months 前 | 1 个回答 | 0

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function chaining when one function has multiple outputs
Similar question has been asked before, but I would ask the question in a more specific manner. If the function in the input en...

3 months 前 | 1 个回答 | 0

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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...

6 months 前 | 0 个回答 | 0

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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...

6 months 前 | 1 个回答 | 0

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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...

10 months 前 | 1 个回答 | 0

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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...

1 year 前 | 0 个回答 | 0

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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...

1 year 前 | 2 个回答 | 0

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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', ',...

1 year 前 | 1 个回答 | 0

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已回答
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...

1 year 前 | 0

已回答
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...

1 year 前 | 0

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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...

1 year 前 | 0

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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...

1 year 前 | 2 个回答 | 0

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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...

1 year 前 | 0

提问


(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...

1 year 前 | 1 个回答 | 1

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(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) ...

1 year 前 | 0

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(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 ...

1 year 前 | 1 个回答 | 0

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(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...

1 year 前 | 0

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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...

1 year 前 | 0 个回答 | 0

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(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 ...

1 year 前 | 3 个回答 | 0

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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 前 | 1 个回答 | 0

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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 前 | 1 个回答 | 0

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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 前 | 1 个回答 | 0

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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...

1 year 前 | 0

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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 前 | 4 个回答 | 0

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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 前 | 2 个回答 | 0

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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...

1 year 前 | 1 个回答 | 0

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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...

1 year 前 | 0

| 已接受

提问


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...

1 year 前 | 1 个回答 | 0

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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...

1 year 前 | 1 个回答 | 0

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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 ...

1 year 前 | 1 个回答 | 0

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