Piecewise functions done right

[vbraun]

Rewrite piecewise functions as symbolic functions.

For a (late) discussion about interface issues see https://groups.google.com/forum/?hl=en#!topic/sage-devel/dgwUMsdiHfM

Depends on #14800
Depends on #14780
Depends on #13125
Depends on #14802
Depends on #16397
Depends on #17759

CC: @eviatarbach @kcrisman @slel @mkoeppe

Component: symbolics

Author: Volker Braun, Ralf Stephan

Branch/Commit: 966859c

Reviewer: Volker Braun, Ralf Stephan

Issue created by migration from https://trac.sagemath.org/ticket/14801

[vbraun]

comment:1

Patch is just a first proof of concept now

[vbraun]

Dependencies: #14800, #14780, #9556, #13125

[vbraun]

Updated patch

[eviatarbach]

comment:3

Attachment: trac_14801_piecewiese.patch.gz

[kcrisman]

comment:4

Presumably this would (help) solve #11225, #1773, #8994, and #8603. And #12123. Or maybe this won't help if it removes support for those things...

See also Maxima's pw.mac.

[rwst]

New commits:

6d00b38

Trac 14801: Rewrite piecewise functions as symbolic functions

[rwst]

Commit: 6d00b38

[rwst]

Branch: public/piecewise