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=== Install TclTk and recompile pyhon === | === Install TclTk and recompile python === |
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sage: C= SteenrodAlgebraGroundFieldResolution(SteenrodAlgebra(2),filename=":memory:") | sage: C = SteenrodAlgebraGroundFieldResolution(SteenrodAlgebra(2),filename=":memory:") |
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For comments, questions and eveyrthing else contact me: [email protected] | For comments, questions and everything else contact me: [email protected] |
Yacop/Sage integration
Yacop stands for "Yet Another Cohomology Program". It's a package of routines that allow to compute and investigate Steenrod algebra resolutions. The following functions are currently available:
- Computation of a minimal resolution
- Graphical user interface (includes creation of postscript charts and SQL-console)
- Ext of small modules
- Chain maps (includes computation of P^0 and change of algebra maps)
Not everything has been thoroughly tested, though. Here's a little TO-DO list
- Framework for modules is missing
- Regression test suite needs to be created
Installation instructions
Download the following Sage packages & patches
tcltk8.5.7 from http://nullhomotopie.de/tcltk8.5.7.spkg
yacop1.0 from http://nullhomotopie.de/yacop1.0.spkg
patch from http://nullhomotopie.de/11803.patch
Install TclTk and recompile python
This is done via the commands
sage -f -s tcltk8.5.7.spkg
sage -f -s python-2.5.2.p9
[Python recompilation is only required because Tcl/Tk was not installed on the official sage-build machine at build time. This can probably be fixed in the future.]
To check whether Tcl/Tk has been succesfully installed, you should try the following commands in Sage:
cn@zonk:~/sgnew/sage-3.4-linux-openSUSE_11.1_x86_64-x86_64-Linux> sage ---------------------------------------------------------------------- | Sage Version 3.4, Release Date: 2009-03-11 | | Type notebook() for the GUI, and license() for information. | ---------------------------------------------------------------------- sage: import Tkinter sage: rt = Tkinter.Tcl() sage: rt.eval("info patchlevel") '8.5.7'
Install Yacop
This is done with
sage -f -s yacop1.0.spkg
Yacop has been succesfully installed if the following works:
cn@zonk:~/sgnew/sage-3.4-linux-openSUSE_11.1_x86_64-x86_64-Linux> sage ---------------------------------------------------------------------- | Sage Version 3.4, Release Date: 2009-03-11 | | Type notebook() for the GUI, and license() for information. | ---------------------------------------------------------------------- sage: import Tkinter sage: Tkinter.Tcl().eval("package require yacop::sage") '1.0'
Apply the Sage patch
In sage run hg_sage.patch("11803.patch")
Fix a strange problem with quaternion_order via touch devel/sage-main/sage/algebras/quaternion_order.py
Re-build sage library with sage -b
Generate documentation with sage -docbuild reference html
Now point your browser at the file devel/sage/doc/output/html/en/reference/algebras.html from your installation to see the documentation.
Here's a little session that shows Yacop in action:
sage: C = SteenrodAlgebraGroundFieldResolution(SteenrodAlgebra(2),filename=":memory:") sage: time C.extend(s=30,n=50) CPU times: user 10.92 s, sys: 0.18 s, total: 11.10 s Wall time: 11.16 s sage: C.generators(n=45) {g(4,45), g(9,45), g(16,45), g(3,45), g(7,45), g(12,45), g(17,45), g(6,45), g(15,45), g(5,45), g(5,45,1)}
And finally, here's a little screenshot of the graphical user interface: http://nullhomotopie.de/yacopgui.png
For comments, questions and everything else contact me: [email protected]