'xcorr' unable to use

I tried to calculate the xcorr and i got the 'Undefined function 'xcorr' for input arguments of type 'double'

I tried this example from the MathWorks documentation:

n = 0:15;

x = 0.84.^n;

y = circshift(x,5);

[c,lags] = xcorr(x,y);

stem(lags,c);

[Walter Roberson]

Which MATLAB version are you using?

[Image Analyst]

Worked for me. What does this show

>> which -all xcorr

Do you see this:

C:\Program Files\MATLAB\R2020a\toolbox\matlab\datafun\xcorr.m

C:\Program Files\MATLAB\R2020a\toolbox\matlab\bigdata\@tall\xcorr.m % tall method

C:\Program Files\MATLAB\R2020a\toolbox\parallel\gpu\@gpuArray\xcorr.m % gpuArray method

If not, is your script also named xcorr.m?

If you don't see the one in the datafun folder, try this:

>> restoredefaultpath

[Jasmin Ittner]

I use der MatLab R2013b.

It show me this:

C:\Program Files\MATLAB\R2013b\toolbox\signal\signal\xcorr.m % Has no license available

C:\Program Files\MATLAB\R2013b\toolbox\signal\signal\@gpuArray\xcorr.m % gpuArray method, Has no license available

The signal toolbox must be purchased?

From which version this signal toolbox is included?

[Image Analyst]

I'd call and ask them. From what I showed, it seems to be part of base MATLAB now, not part of the Signal Processing Toolbox anymore (which I have). Your version is an antique - 6.5 years old. Can you upgrade it? Otherwise you can always write your own xcorr function - it's not hard, try it.

Answer 1

[Walter Roberson]

Up to R2018b, xcorr was part of the Signal Processing Toolbox; as of R2019a it was moved into basic MATLAB.

The signal toolbox must be purchased?

For your version, it would have to be. However, it is no longer possible to purchase toolboxes for versions that old. You would need to upgrade to the current release, and if you did that then you would not need te signal processing toolbox.

You might be able to take advantage of some of the File Exchange contributions, such as

https://www.mathworks.com/matlabcentral/fileexchange/63337-time-domain-cross-correlation-function