I get the followig error.Could you please give an answer???

I get the followig error.Could you please give an answer??? "Undefined function 'qfunc' for input arguments of type 'double'."

Answer 1

[Walter Roberson]

qfunc() is part of the Communications Systems Toolbox; you would need that toolbox installed and licensed to use it.

[farah arabian]

Walter I have "Communications Systems Toolbox" with license.

[Walter Roberson]

What does

which -all qfunc

show?

qfunc() has been part of Communications Systems Toolbox for a long time, so it is not a problem that your version is too old for it (not unless you are using MATLAB 6.0 maybe!)

Answer 2

[farah arabian]

here you are Walter

 ver
----------------------------------------------------------------------------------------------------
MATLAB Version: 9.2.0.556344 (R2017a)
MATLAB License Number: •••••• 
Operating System: Microsoft Windows 10 Home Single Language Version 10.0 (Build 15063)
Java Version: Java 1.7.0_60-b19 with Oracle Corporation Java HotSpot(TM) 64-Bit Server VM mixed mode
----------------------------------------------------------------------------------------------------
MATLAB                                                Version 9.2         (R2017a)
Simulink                                              Version 8.9         (R2017a)
Bioinformatics Toolbox                                Version 4.8         (R2017a)
Communications System Toolbox                         Version 6.4         (R2017a)
Computer Vision System Toolbox                        Version 7.3         (R2017a)
Control System Toolbox                                Version 10.2        (R2017a)
Curve Fitting Toolbox                                 Version 3.5.5       (R2017a)
DSP System Toolbox                                    Version 9.4         (R2017a)
Data Acquisition Toolbox                              Version 3.11        (R2017a)
Fixed-Point Designer                                  Version 5.4         (R2017a)
Global Optimization Toolbox                           Version 3.4.2       (R2017a)
Image Processing Toolbox                              Version 10.0        (R2017a)
Instrument Control Toolbox                            Version 3.11        (R2017a)
MATLAB Coder                                          Version 3.3         (R2017a)
MATLAB Compiler                                       Version 6.4         (R2017a)
MATLAB Compiler SDK                                   Version 6.3.1       (R2017a)
Mapping Toolbox                                       Version 4.5         (R2017a)
Neural Network Toolbox                                Version 10.0        (R2017a)
Optimization Toolbox                                  Version 7.6         (R2017a)
Parallel Computing Toolbox                            Version 6.10        (R2017a)
Partial Differential Equation Toolbox                 Version 2.4         (R2017a)
Robust Control Toolbox                                Version 6.3         (R2017a)
Signal Processing Toolbox                             Version 7.4         (R2017a)
Simscape                                              Version 4.2         (R2017a)
Simscape Multibody                                    Version 5.0         (R2017a)
Simulink 3D Animation                                 Version 7.7         (R2017a)
Simulink Coder                                        Version 8.12        (R2017a)
Simulink Control Design                               Version 4.5         (R2017a)
Simulink Design Optimization                          Version 3.2         (R2017a)
Stateflow                                             Version 8.9         (R2017a)
Statistics and Machine Learning Toolbox               Version 11.1        (R2017a)
Symbolic Math Toolbox                                 Version 7.2         (R2017a)
System Identification Toolbox                         Version 9.6         (R2017a)
Wavelet Toolbox                                       Version 4.18        (R2017a)
>> which -all qfunc
C:\Program Files\MATLAB\R2017a\toolbox\comm\comm\qfunc.m  % Has no license available

[Walter Roberson]

"Has no license available"

You have the product installed but you do not have a license for it.

[farah arabian]

it's solved, you were correct, thank you Walter

[Walter Roberson]

Those are some expensive toolboxes to have installed on a "Windows 10 Home" system -- $25000 or $30000 or so of software if all of those were licensed under a Standard (commercial) license [I notice you are not using an Academic or Home or Student license.]