Question
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'.
Expert Answer
Prashant Kumar
PhD Expert
Answered Aug 24, 2026
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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