where (what package) is the Matlab's wvd function?

where (what package) is the Matlab's wvd function?

Answer 1

[Stephen23]

Signal Processing Toolbox.

You can easily find this out yourself using the online help, simply finding that page using your favorite internet search engine:

https://www.mathworks.com/help/signal/ref/wvd.html

1. the URL contains the word signal, telling you that it is in the Signal Processing toolbox.
2. ... not only that, but when you shorten the URL down to signal, then it takes you to the main page for that toolbox.
3. the second link of the contents (top of the page on the left) clearly states "Signal Processing Toolbox".

[Robert Black]

I have the Signal Processing Toolbox, and when I type "wvd" at the command line I get "not recognized"

[Robert Black]

Yes I have seen the documentation, but still "wvd" is not recognized.

[Guillaume]

At the bottom of that documentation page, it clearly says:

Introduced in R2018b

I would gather that you're running an older version.

wvd also comes with the wavelet toolbox. If you don't have the toolbox required, matlab will tell you (as long as the version you have is not older than the function)

>> wvd
'wvd' requires one of the following:
  Signal Processing Toolbox
  Wavelet Toolbox

[Guillaume]

Robert Black comment moved here from an answer:

I have both Signal Proc and wavelet toolbox. I am running R2018A. Did the wvd function not exist at all, in any package, before R2018b? Seems like have seen references to it that were much older.

[Guillaume]

It may have been available as a download from the file exchange (no idea, just a guess), but the documentation is very clear, it's only been added to the toolbox in 2018b.

[Stephen23]

https://www.mathworks.com/matlabcentral/fileexchange/42698-wigner-hough-transform

https://groups.google.com/forum/#!topic/comp.soft-sys.matlab/plYtt8twcRo