autocorr - unable to use

When I used autocorr function in matlab, i got an error "Undefined function 'autocorr' for input arguments of type 'double'"

The error is repeated even for the same sample example from matlab website.

Can anyone tell me why ? (I have econometrics installed. I am using Matlab 2013b version)

Answer 1

[the cyclist]

What do you get if you type

which autocorr

at the command line?

If you type

ver

at the command line, does it indicate that the Econometrics Toolbox is installed?

[chaos]

Thank you. It says 'autocorr' not found. There is no mention of 'Econometrics' toolbox after typing 'ver'.

However on typing " license('test','econometrics_toolbox') " (which I found from on internet), the result is 1.

How else can I use autocorrelation function ?

[the cyclist]

The following line appears in the documentation for the license command:

 "Note:   Testing for a license only confirms that the license exists. It does not confirm that the license can be checked out. For example, license will return 1 if a license exists, even if the license has expired or if a system administrator has excluded you from using the product in an options file. The existence of a license does not indicate that the product is installed."

I think you don't actually have the Econometrics Toolbox installed.

Answer 2

[Image Analyst]

I don't see any such function in my MATLAB either. Try xcorr. If you use the same array twice, the cross correlation is an autocorrelation

crossCorrelation = xcorr(signal, signal); % 1D case
crossCorrelation = xcorr2(signal, signal); % 2D case