MATLAB: Spectrogram error in matlab

Signal Processing Toolboxspectrogram

Hello, I am trying to plot a spectrogram using MATLAB at home but I am getting the following error:
Undefined function 'spectrogram' for input arguments of type 'double'.
any thoughts?

Best Answer

Use ver to see if you have the Signal Processing Toolbox. If you don't contact the sales department.
>> ver
------------------------------------------------------------------------
MATLAB Version: 8.5.0.197613 (R2015a)
MATLAB License Number: ******
Operating System: Microsoft Windows 7 Enterprise  Version 6.1 (Build 7601: Service Pack 1)
Java Version: Java 1.7.0_60-b19 with Oracle Corporation Java HotSpot(TM) 64-Bit Server VM mixed mode
-----------------------------------------------------------------------
MATLAB                                                Version 8.5        (R2015a)
Signal Processing Toolbox                             Version 7.0        (R2015a)
If you have it, "which" should show this:
>> which spectrogram
C:\Program Files\MATLAB\R2015a\toolbox\signal\signal\spectrogram.m
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