spectrogram error in matlab

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’.

ANSWER

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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
-----------------------------------------------------------------------

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spectrogram error in matlab

spectrogram error in matlab