Why won't padarray work?

Code:

>> a = [ 1 2 3 4 ];
b = padarray(a,[0 3],'symmetric','pre')
??? Undefined function or method 'padarray' for input arguments of type 'double'.

Given that this is an example from the documentation for padarray, I'm not sure why it isn't working.

PADARRAY Documentation says:

%   Class Support
%   -------------
%   When padding with a constant value, A can be numeric or logical.
%   When padding using the 'circular', 'replicate', or 'symmetric'
%   methods, A can be of any class.  B is of the same class as A.

My version information:

>> ver
    -------------------------------------------------------------------------------------
    MATLAB Version 7.11.0.584 (R2010b)
    MATLAB License Number: ••••••
    Operating System: Microsoft Windows 7 Version 6.1 (Build 7601: Service Pack 1)
    Java VM Version: Java 1.6.0_17-b04 with Sun Microsystems Inc. Java HotSpot(TM) 64-Bit Server VM mixed mode
    -------------------------------------------------------------------------------------
    MATLAB                                                Version 7.11       (R2010b)
    Simulink                                              Version 7.6        (R2010b)
    Bioinformatics Toolbox                                Version 3.6        (R2010b)
    Communications Blockset                               Version 5.0        (R2010b)
    Communications Toolbox                                Version 4.6        (R2010b)
    Control System Toolbox                                Version 9.0        (R2010b)
    Curve Fitting Toolbox                                 Version 3.0        (R2010b)
    Database Toolbox                                      Version 3.8        (R2010b)
    EDA Simulator Link                                    Version 3.2        (R2010b)
    Filter Design HDL Coder                               Version 2.7        (R2010b)
    Filter Design Toolbox                                 Version 4.7.1      (R2010b)
    Financial Toolbox                                     Version 3.8        (R2010b)
    Fixed-Point Toolbox                                   Version 3.2        (R2010b)
    Fuzzy Logic Toolbox                                   Version 2.2.12     (R2010b)
    Global Optimization Toolbox                           Version 3.1        (R2010b)
    Image Processing Toolbox                              Version 7.1        (R2010b)
    Instrument Control Toolbox                            Version 2.11       (R2010b)
    MATLAB Builder EX                                     Version 1.3        (R2010b)
    MATLAB Compiler                                       Version 4.14       (R2010b)
    Mapping Toolbox                                       Version 3.2        (R2010b)
    Neural Network Toolbox                                Version 7.0        (R2010b)
    Optimization Toolbox                                  Version 5.1        (R2010b)
    Parallel Computing Toolbox                            Version 5.0        (R2010b)
    Parallel Computing Toolbox                            Version 5.0        (R2010b)
    Partial Differential Equation Toolbox                 Version 1.0.17     (R2010b)
    RF Toolbox                                            Version 2.8        (R2010b)
    Real-Time Workshop                                    Version 7.6        (R2010b)
    Robust Control Toolbox                                Version 3.5        (R2010b)
    Signal Processing Blockset                            Version 7.1        (R2010b)
    Signal Processing Toolbox                             Version 6.14       (R2010b)
    SimPowerSystems                                       Version 5.3        (R2010b)
    Simulink Control Design                               Version 3.2        (R2010b)
    Simulink Fixed Point                                  Version 6.4        (R2010b)
    Spreadsheet Link EX                                   Version 3.1.2      (R2010b)
    Stateflow                                             Version 7.6        (R2010b)
    Statistics Toolbox                                    Version 7.4        (R2010b)
    Symbolic Math Toolbox                                 Version 5.5        (R2010b)
    System Identification Toolbox                         Version 7.4.1      (R2010b)
    Wavelet Toolbox                                       Version 4.6        (R2010b)

Answer 1

[Jonathan Sullivan]

type:

which padarray

What does it say?

[Grant]

I guess it's a a license issue.

>> which padarray C:\Program Files\MATLAB\R2011a\toolbox\images\images\padarray.m % Has no license available

Answer 2

[Sean de Wolski]

One place to start:

rehash toolboxcache