Undefined function 'extractfield' for input arguments of type 'struct' in MATLAB R2023a

Hello Guys,

i just wanted to use the extractfield function in MATLAB as i used to do it yesterday. After upgrading from Version 2022b to 2023a today morning, it gives me an error in the exact same code which was running perfectly yesterday.

Undefined function 'extractfield' for input arguments of type 'struct'.

Does anyone else have this error with the new Version? Is there maybe a new function in 2023a for extracting information out of a struct?

Greetings

Answer 1

[Stephen23]

"After upgrading from Version 2022b to 2023a today morning, it gives me an error in the exact same code which was running perfectly yesterday."

Most likely because you have the Mapping Toolbox installed in the old version, but you did not install it in the new version. The function EXTRACTFIELD is part of the Mapping Toolbox:

https://www.mathworks.com/help/map/ref/extractfield.html

"Is there maybe a new function in 2023a for extracting information out of a struct?"

Nope, because EXTRACTFIELD still works just fine. Of course you could use GETFIELD or dynamic fieldnames and some basic concatenation, which will do much the same thing. For example, where S is your structure array:

F = name of the field that you want
A = [S.(F)];

Which is basically what EXTRACTFIELD does inside anyway.

https://www.mathworks.com/help/matlab/matlab_prog/generate-field-names-from-variables.html

https://www.mathworks.com/help/matlab/matlab_prog/comma-separated-lists.html

https://www.mathworks.com/matlabcentral/answers/1656435-tutorial-comma-separated-lists-and-how-to-use-them

[Marco]

Thanks for the hint!

Is it working for you in 2023a? I'm just asking because i was deinstalling version 2022b before installing the new one and reinstalled all of the toolboxes while installing 2023b. I thought that in this case it would install the newest version automatically..

Update: It is now working again! Maybe i just forgot to click on the Mapping Toolbox during the installation process...

[Stephen23]

"Is it working for you in 2023a?"

ver

-----------------------------------------------------------------------------------------------------
MATLAB Version: 9.14.0.2218432 (R2023a)
MATLAB License Number: 0
Operating System: Linux 5.4.233-0504233-generic #202302250651 SMP Sat Feb 25 12:26:27 UTC 2023 x86_64
Java Version: Java 1.8.0_292-b10 with AdoptOpenJDK OpenJDK 64-Bit Server VM mixed mode
-----------------------------------------------------------------------------------------------------
MATLAB                                                Version 9.14        (R2023a)
Simulink                                              Version 10.7        (R2023a)
5G Toolbox                                            Version 2.6         (R2023a)
Aerospace Blockset                                    Version 6.0         (R2023a)
Aerospace Toolbox                                     Version 4.4         (R2023a)
Antenna Toolbox                                       Version 5.4         (R2023a)
Audio Toolbox                                         Version 3.4         (R2023a)
Automated Driving Toolbox                             Version 3.7         (R2023a)
Bioinformatics Toolbox                                Version 4.17        (R2023a)
Bluetooth Toolbox                                     Version 1.2         (R2023a)
Communications Toolbox                                Version 8.0         (R2023a)
Computer Vision Toolbox                               Version 10.4        (R2023a)
Control System Toolbox                                Version 10.13       (R2023a)
Curve Fitting Toolbox                                 Version 3.9         (R2023a)
DO Qualification Kit                                  Version 3.15        (R2023a)
DSP System Toolbox                                    Version 9.16        (R2023a)
Database Toolbox                                      Version 11.0        (R2023a)
Datafeed Toolbox                                      Version 6.4         (R2023a)
Deep Learning Toolbox                                 Version 14.6        (R2023a)
Econometrics Toolbox                                  Version 6.2         (R2023a)
Embedded Coder                                        Version 7.10        (R2023a)
Filter Design HDL Coder                               Version 3.1.13      (R2023a)
Financial Instruments Toolbox                         Version 3.6         (R2023a)
Financial Toolbox                                     Version 6.5         (R2023a)
Fixed-Point Designer                                  Version 7.6         (R2023a)
Fuzzy Logic Toolbox                                   Version 3.1         (R2023a)
Global Optimization Toolbox                           Version 4.8.1       (R2023a)
HDL Coder                                             Version 4.1         (R2023a)
HDL Verifier                                          Version 7.1         (R2023a)
IEC Certification Kit                                 Version 4.0         (R2023a)
Image Acquisition Toolbox                             Version 6.7.1       (R2023a)
Image Processing Toolbox                              Version 11.7        (R2023a)
Industrial Communication Toolbox                      Version 6.2         (R2023a)
Instrument Control Toolbox                            Version 4.8         (R2023a)
LTE Toolbox                                           Version 3.9         (R2023a)
MATLAB Compiler                                       Version 8.6         (R2023a)
MATLAB Compiler SDK                                   Version 7.2         (R2023a)
MATLAB Report Generator                               Version 5.14        (R2023a)
Mapping Toolbox                                       Version 5.5         (R2023a)
Mixed-Signal Blockset                                 Version 2.4         (R2023a)
Model Predictive Control Toolbox                      Version 8.1         (R2023a)
Navigation Toolbox                                    Version 2.4         (R2023a)
Optimization Toolbox                                  Version 9.5         (R2023a)
Parallel Computing Toolbox                            Version 7.8         (R2023a)
Partial Differential Equation Toolbox                 Version 3.10        (R2023a)
Phased Array System Toolbox                           Version 5.0         (R2023a)
Powertrain Blockset                                   Version 2.0         (R2023a)
Predictive Maintenance Toolbox                        Version 2.7         (R2023a)
RF Blockset                                           Version 8.5         (R2023a)
RF Toolbox                                            Version 4.5         (R2023a)
Requirements Toolbox                                  Version 2.2         (R2023a)
Risk Management Toolbox                               Version 2.2         (R2023a)
Robotics System Toolbox                               Version 4.2         (R2023a)
Robust Control Toolbox                                Version 6.11.3      (R2023a)
Sensor Fusion and Tracking Toolbox                    Version 2.5         (R2023a)
SerDes Toolbox                                        Version 3.0         (R2023a)
Signal Processing Toolbox                             Version 9.2         (R2023a)
SimBiology                                            Version 6.4.1       (R2023a)
SimEvents                                             Version 5.14        (R2023a)
Simscape                                              Version 5.5         (R2023a)
Simscape Driveline                                    Version 3.7         (R2023a)
Simscape Electrical                                   Version 7.9         (R2023a)
Simscape Fluids                                       Version 3.6         (R2023a)
Simscape Multibody                                    Version 7.7         (R2023a)
Simulink 3D Animation                                 Version 9.6         (R2023a)
Simulink Check                                        Version 6.2         (R2023a)
Simulink Code Inspector                               Version 4.3         (R2023a)
Simulink Coder                                        Version 9.9         (R2023a)
Simulink Control Design                               Version 7.0         (R2023a)
Simulink Coverage                                     Version 5.6         (R2023a)
Simulink Design Optimization                          Version 3.13        (R2023a)
Simulink Design Verifier                              Version 4.9         (R2023a)
Simulink PLC Coder                                    Version 3.8         (R2023a)
Simulink Real-Time                                    Version 8.2         (R2023a)
Simulink Report Generator                             Version 5.14        (R2023a)
Simulink Test                                         Version 3.8         (R2023a)
Stateflow                                             Version 10.8        (R2023a)
Statistics and Machine Learning Toolbox               Version 12.5        (R2023a)
Symbolic Math Toolbox                                 Version 9.3         (R2023a)
System Identification Toolbox                         Version 10.1        (R2023a)
Text Analytics Toolbox                                Version 1.10        (R2023a)
Vehicle Dynamics Blockset                             Version 2.0         (R2023a)
Vehicle Network Toolbox                               Version 5.4         (R2023a)
Vision HDL Toolbox                                    Version 2.7         (R2023a)
WLAN Toolbox                                          Version 3.6         (R2023a)
Wavelet Toolbox                                       Version 6.3         (R2023a)
Wireless HDL Toolbox                                  Version 2.6         (R2023a)

S = dir('..');
extractfield(S,'name')

ans = 1×3 cell array
    {'.'}    {'..'}    {'mss.system.HH9h7Z'}

which extractfield -all

/MATLAB/toolbox/map/map/extractfield.m