Zaikun Zhang

Sun Yat-sen University

Last seen: 1 month ago | Active since 2019

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http://www.zhangzk.net

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An issue with parfor in MATLAB R2023a--R2025a
Consider two MATLAB m files named profile.m and try_parfor.m as follows. % profile.m function profile() olddir = pwd(...

1 month ago | 0 answers | 2

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Answered
Bug: MATLAB 2025a segfaults on Ubuntu when handling Fortran MEX files with internal subroutines
---------- Forwarded message --------- From: <support@mathworks.com> Date: Mon, Jul 14, 2025 at 7:14 PM Subject: Re: Bug in M...

3 months ago | 0

| accepted

Question

Bug: MATLAB 2025a segfaults on Ubuntu when handling Fortran MEX files with internal subroutines
This is very likely a bug of MATLAB R2025a on Ubuntu. I would like to know whether anyone else can reproduce it (on Ubuntu). Tha...

4 months ago | 1 answer | 0

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answer

Submitted

PDFO: Powell's Derivative-Free Optimization solvers
Interfaces by Tom M. Ragonneau and Zaikun Zhang for using the late Professor M. J. D. Powell's derivative-free optimization solv...

1 year ago | 3 downloads |

0.0 / 5

Submitted

PRIMA: Optimization without Using Derivatives
PRIMA is a package for solving general nonlinear optimization problems without using derivatives.

1 year ago | 3 downloads |

5.0 / 5

Question

Does MEX of MATLAB R2023b (update 6) on macOS-13 work with Xcode 15 and Intel oneAPI 2023?
[Update 20240217: I am almost sure that this is a bug of MATLAB R2023b. The default MEX options are wrongly specified. They are ...

1 year ago | 0 answers | 1

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Answered
Strange behavior of `copyfile` regarding symlinks on Linux and macOS
Update 20231031: Below is the response from MathWorks support. " Please be assured that this has been confirmed as a bug and i...

2 years ago | 0

| accepted

Question

Strange behavior of `copyfile` regarding symlinks on Linux and macOS
Consider the following function. %test_copyfile.m function test_copyfile() ...

2 years ago | 1 answer | 0

1

answer

Submitted

MatCUTEst
MatCUTEst is a package for facilitating the usage of CUTEst (https://github.com/ralna/CUTEst) in MATLAB on Linux.

2 years ago | 3 downloads |

0.0 / 5

Submitted

setup_mex: Set up MEX on Windows and macOS for Fortran and C
This package provides scripts that facilitate setting up the MATLAB MEX on Windows and macOS for compiling Fortran and C using I...

2 years ago | 6 downloads |

0.0 / 5

Answered
fmincon optimization not running properly, stops beacuase of StepTolerance
I conducted a quick experiment using the function and data in the question. The solvers are fmincon of MATLAB and PRIMA, which i...

2 years ago | 1

Answered
Bug in MATLAB R2022a: MEX does not support gfortran 8.x as specified in the official documentation
According to MEX team (20220406, copied from a GitHub Issue): This is bug with R2022a and we are fix it as soon as possible. T...

3 years ago | 1

| accepted

Question

Bug in MATLAB R2022a: MEX does not support gfortran 8.x as specified in the official documentation
Update (20220406): The MathWorks MEX team has confirmed this problem as a bug of MATLAB R2022a. A workaround is provided by the ...

3 years ago | 1 answer | 0

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Question

Does the execution of addpath/rmpath/savepath in one workspace affect other workspaces?
Does the execution of addpath/rmpath/savepath in one workspace affect other workspaces? Suppose that I have two instances of MA...

3 years ago | 1 answer | 0

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answer

Answered
Bug: MATLAB crashes when mexifying the official `timestwo.c`
Here is the latest update (20220225) received from the supporting team of MathWorks: ``` Got the confirmation that the crash...

3 years ago | 0

| accepted

Answered
Why trust-region-reflective algorithm in fmincon require a gradient as input?
What you @SM are looking for is called Derivative-Free Optimization methods. They do not require derivatives or analytical formu...

3 years ago | 0

Question

Is MEX known to be slow on macOS?
Question: Is MEX known to be slow on macOS? Here, "slow" refers to the speed of setting MEX up, of compiling MEX code, and of ...

3 years ago | 0 answers | 0

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answers

Question

Bug: MATLAB crashes when mexifying the official `timestwo.c`
Update (20220225): Here is the latest update received from the supporting team of MathWorks. ``` Got the confirmation that th...

3 years ago | 1 answer | 0

1

answer

Answered
Need help with mathematical optimization - fmincon
Your problem is a simulation-based optimization problem. You may try PDFO ( https://www.mathworks.com/matlabcentral/fileexchan...

5 years ago | 0

Question

Supress MEX warning: f951: Warning: Nonexistent include directory ‘MATLABROOT/simulink/include’ [-Wmissing-include-dirs]
I have MATLAB 2019b but not simulink installed on my computer (ubuntu 16.04). When trying mex(fullfile(matlabroot, 'extern', 'e...

5 years ago | 1 answer | 0

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Question

Recursive definition of anonymous function
(Note that the mathematics in this question is hypothetical and illustrative.) Suppose that I am writing a function "foo" to mi...

5 years ago | 1 answer | 1

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Question

The return type of mxIsDouble, mxIsSingle, and mxIsClass (mex for Fortran)
According to https://www.mathworks.com/help/matlab/apiref/mxisclass.html the return of mxIsDouble for Fortran (also mxIsSingle ...

6 years ago | 1 answer | 0

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Question

Portable declaration of REAL variables in mex gateway for Fortran
(The same question is asked here: https://stackoverflow.com/questions/57244555/portable-declaration-of-real-variables-in-mex-gat...

6 years ago | 1 answer | 0

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