new feature: iswt2

[sciunto]

See nigma/pywt#1

[rgommers]

That feature request makes sense. Would be good to add. We also still need to add the 1-D version.

[ThomasA]

It seems this feature is being worked on in #55 ?

[ThomasA]

I am starting to add some tests for iswt and iswt2. It seems that the existing tests for swt are in 'pywt/tests/test_multilevel.py' and there are no tests for swt2.
It seems pywt is not using unittest but relies on assertions to raise an error whenever something is not right - is this correct? So should I continue by adding tests for iswt, iswt2, and probably swt2 to 'pywt/tests/test_multilevel.py' using the same assertion-style tests?

[ThomasA]

In #81 we have discussed moving swt2 to 'multilevel.py'. Should I go ahead and place iswt and iswt2 in 'multilevel.py' right away?

[sciunto]

I would vote to follow the scipy guidelines for the tests suite. I'll make the job easier for a future integration. @rgommers can probably confirm this.

[rgommers]

Putting them in multilevel.py now sounds fine to me.

[rgommers]

Regarding the tests, they're based on nose and numpy.testing which is pretty much the standard for the scientific Python stack. nose is definitely much more flexible/powerful than plain unittest - the only other serious contender is py.test.

The testing guidelines are at https://github.com/numpy/numpy/blob/master/doc/TESTS.rst.txt

So +1 for putting test cases in test_multilevel.py in the same style.

[rgommers]

No tests for swt2: the test coverage is still lacking in places unfortunately. In 0.2.2 there were only doctests and now we're at 61% coverage, so it's going up nicely but more is needed.

[ThomasA]

I'll be happy to write tests for swt2 as well after I add some for iswt2 and iswt.

[rgommers]

That would be great!

[aaren]

Have left my iswt work in progress (cut from #55) in #86. May or may not be useful.