MATLAB: Undefined function ‘butter’ for input arguments of type ‘double’

butterMATLABMATLAB Builder NEproblem resolved with mathworks tech supportSignal Processing Toolboxundefined function

I have a .net assembly DLL that is built in matlab which is used in a program. I'm currently using matlab 2010b 32 bit and everything works fine. I'm running into a problem migrating to 2014a 32 bit however. With the 2014a version i get an error with the apparent first call to a signal processing toolbox function:
… MWMCR::EvaluateFunction error … Undefined function 'butter' for input arguments of type 'double'.
I have the toolboxes installed correctly i think:
>> ver
MATLAB Version: (R2014a)
MATLAB License Number: 685057
Operating System: Microsoft Windows 7 Ultimate Version 6.1 (Build 7601: Service Pack 1)
Java Version: Java 1.7.0_11-b21 with Oracle Corporation Java HotSpotâ„¢ Client VM mixed mode
MATLAB Version 8.3 (R2014a)
MATLAB Builder JA Version 2.3.1 (R2014a)
MATLAB Builder NE Version 4.2.1 (R2014a)
MATLAB Compiler Version 5.1 (R2014a)
Signal Processing Toolbox Version 6.21 (R2014a)
I am able to successfully call butter from the matlab command window. I'm also able to successfully execute the line that causes the error with the exact argument values in the command window:
>> [b,a] = butter(N,Wn)
b =
1.0e-07 *
0.3081 0.9244 0.9244 0.3081
a =
1.0000 -2.9874 2.9749 -0.9875
I have Matlab 2014a 32 bit and the 2014a MCR installed. Any ideas? thanks, rob

Best Answer

With some searching I found that this is a known bug in 2014a which was fixed in 2014b. I applied the patch located here: and it seems to work now.