autocorr not working

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What steps will reproduce the problem?
1. a = randn(1,100) 
2. c = autocorr(a)
3.

What is the expected output? What do you see instead?
The expected output is the autcorrelation of a. The function autocorr generates 
an error because its subfunction xcorr(a,b) is called without the argument b.

What version / revision of the product are you using? On what operating
system?

Ubuntu 12.04. MATLAB 7.11.0.584 (R2010b)

Please provide any additional information below.

MATLAB provides an autocorr function. If there is aneed for a new one, it 
should have a different name.

Original issue reported on code.google.com by enr.dile...@gmail.com on 10 Dec 2013 at 11:51

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Moved to GitHub: https://github.com/probml/pmtk3/issues/64

Original comment by irosen on 4 Jan 2014 at 2:39