Error using built-in residue function

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

Answer 1

[Walter Roberson]

Please use

which -all poly

to find out whether you have a poly.m that is overriding the expected poly function.

[Kaleb Christoffersen]

AMAZING! Thank you so much for that tiny but oh so useful bit of information. That was definitely the case.