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'.

any thoughts?

[Star Strider]

You need the Signal Processing Toolbox. I believe it was called specgram in earlier releases, so search on that if you have the Toolbox.

Type ver in the Command Window to see if you have the Signal Processing Toolbox. It will be listed if you have it.

Answer 1

[Image Analyst]

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

[Brandon Adams]

fantastic, thanks for help