MATLAB: Error using built-in residue function

residue error

Upon generating the code below I get an error which points to a line of code within the function .M file:
{START CODE} den1=conv([1 4],[1 4])
den1 =
     1     8    16
EDU>> den2=conv([1 4],[1 4])
den2 =
     1     8    16
EDU>> den3=conv(den1,den2)
den3 =
     1    16    96   256   256
EDU>> den=conv(den3,[1 1])
den =
     1    17   112   352   512   256
EDU>> num = [0 5]
num =
     0     5
EDU>> [res, pole, rem] = residue(num, den) ??? Error using ==> poly Too many output arguments.
Error in ==> residue at 128 v = poly(p); {END CODE}
Sometimes when I run the code with different vectors stored as "num" & "den" the error points to line 139, which I presume to be a result of the roots its testing for.
I'm running MATLAB R2011a on a Mac OSX 10.8 (Mountain Lion). I've even tested a classmates script .M file, which worked just fine on his computer; however, I ran into the same issue when I ran his script on my machine. Here's that script:
{START CODE} num = [5]; den1 = [1 4]; den2 = [1 4]; d1d2 = conv(den1,den2); den3 = [1,1]; dentotal = conv(d1d2,den3);
[r,p,k]=residue(num,dentotal) {END CODE}
Any ideas? Thanks. Kaleb

Best Answer

Please use
which -all poly
to find out whether you have a poly.m that is overriding the expected poly function.
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