MATLAB: Ellip in R2011a

signal processing

I recently updated my MATLAB from R14 to R2011a. I am running the identical code, but I am getting the following error. I am an experience MATLAB user, but I will admit to being a little rusty. Can someone point me in the right direction?
Here is what I put in: [b, a] = ellip(2, 0.5, 20, 0.5, 'low')
Here is the error: ??? Undefined function or method 'eml_assert_all_constant' for input arguments of type 'double'.
Error in ==> ellipap at 8 eml_assert_all_constant(varargin{:});
Error in ==> ellip at 76 [z,p,k] = ellipap(n, Rp, Rs);
As I said this is code I have used in the past, I did hard code in the numbers to make sure that my inputs were okay, but I got the same error.
Anyone else had the same error?
Thank you in advance for any help.

Best Answer

Hi Susan,
my guess: ellipap is some other function then ellip expects.
which ellipap
gives me C:\MATLAB\R2011a\toolbox\signal\signal\ellipap.m
Does it look somewhat similar for you?
Titus
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