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Xingwang Yong


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36 total contributions since 2019

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Question


Colormap Editor, a "fixed" bug leads to other bugs?
In R2020a on windows 10, if you adjusted the system scaling factor, e.g. to 125%, then every time you open Colormap Editor, it w...

1 month ago | 0 answers | 0

0

answers

Question


Under what circumstance, mex-version of lsqcurvefit run slower than m-code of lsqcurvefit?
I converted a function to mex using Coder, which contains lsqcurvefit() to get some speedup. But this mex-version is slower than...

2 months ago | 0 answers | 0

0

answers

Question


Use coder to convert parfor-loop to mex, but mex version is much slower
I convert a function containing a parfor-loop into a mex file to get some speed up. But the mex version of this function is 5x t...

2 months ago | 0 answers | 0

0

answers

Question


Will codegen accelerate sub-functions?
I have functions look like % main.m function main() for i fun1(); end % fun1.m function fun1() for j fun2() ...

2 months ago | 1 answer | 0

1

answer

Answered
Handling bound constraints by the Levenberg-Marquardt algorithm
In matlab2020b, the doc of lsqcurvefit() has removed "The Levenberg-Marquardt algorithm does not handle bound constraints". So ...

2 months ago | 0

Answered
What is the alternate to eval function in a forloop?
Using cell array should help for i for j for k I{i,j,k}=getsiganl(filename1); II{i,j,...

2 months ago | 0

Answered
How to get Data type of workspace loaded variables and how add that datatypes using script?
s=whos; numBytes = sum([s.bytes]);

2 months ago | 1

Answered
Save and load variables of different samples
You could try cell(). You do not have to save the variable names. c = cell(1,1); % each col contains variables of a sample, eac...

2 months ago | 0

Question


codegen can't build the simplest demo
I am using codegen to build the 1st example in its doc, i.e. mcadd.m, it did not work. I am running Maltab2020a on CentOs 8.3. ...

3 months ago | 1 answer | 0

1

answer

Question


Call mex function using system()?
I downloaded a toolbox, which contains a pre-compiled mex file, foo.mexa64. The calling syntax is a little bit confusing, but ...

4 months ago | 1 answer | 0

1

answer

Question


How to customize callback after drag and drop a folder into command window?
For files, it is easy to customize a callback after drag and drop file into command window, as shown here. However, for folders...

5 months ago | 0 answers | 0

0

answers

Question


Using Matlab coder with lsqcurvefit(), can not pass optimoptions as an argument to the target function
I want to convert my function to mex using matlab coder. The function fits data to an exponential model. function ab_fitted = m...

5 months ago | 1 answer | 0

1

answer

Question


How does vectorized lsqcurvefit() calculate sum-of-square, row-wise or column-wise?
I have a 1001 measuments, in each measurement, there is a curve y = a*exp(-b*x) where x and y are vectors containing 8 element...

5 months ago | 1 answer | 0

1

answer

Question


In parfor-loop, can I call a multi-threaded mex and get some speed-up?
I learned the concept of multi-threaded mex from undocumentedmatlab. (It seems this website is unaccessible now ...) I am wonde...

6 months ago | 1 answer | 0

1

answer

Question


Mex, how to copy an array to output
In my mex function my_expm.c, I calculated matrix expoential for the input matrix, void mexFunction(int nlhs,mxArray *plhs[], i...

6 months ago | 1 answer | 0

1

answer

Question


With mxMalloc() and mxSetDoubles(), mex function crash matlab
I try to build a mex interface for a C function r8mat_expm1() that calculates matrix exponential, double *r8mat_expm1 ( int n, ...

6 months ago | 3 answers | 1

3

answers

Question


Mex, how to make visual studio support C11 standard?
I am building a mex function from c language, which uses a non-standard data type, i.e. double complex, double complex *my_f...

6 months ago | 1 answer | 0

1

answer

Question


Remove duplicates only for specific values
A = [1,2,2,3,3,4,5,5,5,6]; value_to_remove = [2,3]; I have an array A, which contains some duplciates. I want to remove part o...

6 months ago | 1 answer | 0

1

answer

Question


During parfor-loop, suddenly get the error "unable to read file"
parfor k = 1:100000 % something else tmpStruct = load(filename); % something else end I have 3 scripts like the...

6 months ago | 0 answers | 0

0

answers

Question


Parallel computing, occasionally get Exception message "Message Catalog MATLAB:load was not loaded from the file"
I am running two jobs on a cluster, job1 on node1, job2 on node2. Job1 starts a little bit earlier than job2. Everything is fin...

6 months ago | 1 answer | 0

1

answer

Question


How can I run parallel job on a specific node?
I have access to a cluster, which contains several nodes, node01,node02, etc. The administrator has configured the Slurm profile...

6 months ago | 1 answer | 0

1

answer

Question


Can I set MarkerFaceColor to part of the data points?
plot(1:10,1:10,'s') Can I set MarkerFaceColor to red for point 1,2,3 while leave the other points unchanged? I tried in intera...

6 months ago | 1 answer | 0

1

answer

Answered
A moving point along a graph.
Although this is an old thread, in case someone needs, trace-marker-along-line

8 months ago | 0

Answered
How to open the file of type Mn.
This should be helpful. MATLAB File Association & Shortcut Fix

8 months ago | 0

Answered
How to find a constrained sum within a region
You can do this in a binary search manner, instead of doing sum() stepwise. Below is pseudo code diameterMin = 0.001; % choo...

9 months ago | 0

Answered
How do you populate a struct with multiple loaded .mat files?
There is a contradiction between your statement and your comment in code. I assume you are asking about " however when I wrap it...

9 months ago | 0

| accepted

Answered
Understanding MatLab's built-in SVM cross-validation on fitcsvm
Maybe kfoldLoss uses a different definition of loss than yours. Your definition is 1-accuracy. https://www.mathworks.com/help/...

9 months ago | 0

Answered
Find indicies of k smallest matrix elements
[~, indices] = sort(A(:), 'ascend'); ind = indices(1:k);

9 months ago | 0

| accepted

Answered
Function with two outputs only giving one output
Apparently, the code is right. I assume you are new to matlab. You should use [C K] = FTOCK (degreeF) to receive two out...

9 months ago | 0

Answered
When I run the file I get an error
You should provide a reproducible snippet. I copy your code and run, it turns out "Unrecognized function or variable 'f'." at li...

9 months ago | 0

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