Why does MATLAB r2016a not recognize "cheby1" as a function?
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I wrote a code implementing a Chebyshev filter which worked fine in my previous version of MATLAB r2013a. I recently had to update to r2016a and the "cheby1" function is no longer recognized. Why is this the case?
采纳的回答
The function cheby1 is part of the Signal Processing Toolbox. Do you have this toolbox installed, and a valid license for it ?
To check, run this command in your command window, and tell us exactly what it prints:
ver
2 个评论
Jacob Mendelson
2016-7-12
编辑：Stephen23
2016-7-22
Walter Roberson
2016-7-22
It would have mentioned the Signal Processing Toolbox if you had that installed.
更多回答（1 个）
ilhem ouerghui
2016-11-24
0 个投票
plz I have the same problem; how to know if the signal processing toolbox is installed in my matlab version? I am using matlab r2016b.
1 个评论
Walter Roberson
2016-11-24
>> ver('signal')
----------------------------------------------------------------------------------------------------
MATLAB Version: 9.1.0.441655 (R2016b)
MATLAB License Number: *****
Operating System: Mac OS X Version: 10.11.6 Build: 15G1108
Java Version: Java 1.7.0_75-b13 with Oracle Corporation Java HotSpot(TM) 64-Bit Server VM mixed mode
----------------------------------------------------------------------------------------------------
Signal Processing Toolbox Version 7.3 (R2016b)
>> which cheby1
/Applications/MATLAB_R2016b.app/toolbox/signal/signal/cheby1.m
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