The problems were with
* `sqrt' and `expt' on single-flonum complex numbers
* `asin' and `acos' on single-flonum arguments and complex results
* `atan' on mixtures of single-flonum and exact arguments
* `gcd' on mixtures of single-flonum and flonum arguments
guard more of the filesystem manipulations with
handlers and log errors instead of letting them
be raised and show up as internal errors
related to PR 13403
teachpack menu.
Instead DrRacket explicitly changes the menu items when
the language changes or when a teachpack is added/removed
Also, Rackety.
Closes PR 13395
* At least stubbed out all (or almost all) `math/matrix' exports; many
have complete documentation (e.g. types, predicates, accessors,
constructors, for loops, conversion, much of "Comparing Matrices")
* Moved `matrix-zero?' and fixed to use (matrix-error-norm) as its norm
* Added `matrix-basis-cos-angle' (currently a stub; should return smallest
singular value of a certain matrix multiplication)
There appears to be no way to make `on-demand' work right for the
Unity window manager's global menu bar, since there's no notificiation
when the menu bar is clicked. We approximate the correct behavior
by calling `on-demand' when a containing frame loses the keyboard
focus, which might be because the menu bar was clicked; that may be
too late (because the menu has already been shown), but it should
work most of the time.
Closes PR 13347.
Relevant to PR 13395, but DrRacket will have to change to work
around the remaining limitations of `on-demand'.
This will make switching back and forth between 5.1.3 and the latest
not lose the frame size and position preferences (since the format
of the data is different now that the current release remembers
the position on a per-monitor-configuration basis)
* Gram-Schmidt using vector type
* QR decomposition
* Operator 1-norm and maximum norm; stub for 2-norm and angle between
subspaces (`matrix-basis-angle')
* `matrix-absolute-error' and `matrix-relative-error'; also predicates
based on them, such as `matrix-identity?'
* Lots of shuffling code about
* Types that can have contracts, and an exhaustive test to make sure
every value exported by `math/matrix' has a contract when used in
untyped code
* Some more tests (still needs some)
