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Simon


Last seen: 25 days ago |  Active since 2022

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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 ago | 1 answer | 0

1

answer

Question


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 ago | 1 answer | 0

1

answer

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...

6 months ago | 0 answers | 0

0

answers

Question


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 ago | 1 answer | 0

1

answer

Question


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 ago | 1 answer | 0

1

answer

Question


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 ago | 0 answers | 0

0

answers

Question


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 ago | 2 answers | 0

2

answers

Question


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 ago | 1 answer | 0

1

answer

Answered
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 ago | 0

Answered
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 ago | 0

Answered
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 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...

1 year ago | 2 answers | 0

2

answers

Answered
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 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...

1 year ago | 1 answer | 1

1

answer

Solved


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....

1 year ago

Solved


Find max
Find the maximum value of a given vector or matrix.

1 year ago

Solved


Inner product of two vectors
Find the inner product of two vectors.

1 year 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...

1 year ago

Solved


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

1 year 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...

1 year 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 ...

1 year ago

Answered
(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 ago | 0

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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 ...

1 year ago | 1 answer | 0

1

answer

Answered
(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 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...

1 year ago | 0 answers | 0

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answers

Question


(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 ago | 3 answers | 0

3

answers

Question


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

answer

Question


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

answer

Question


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

answer

Answered
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 ago | 0

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