From: Michael Orlitzky <michael@orlitzky.com>
Date: Wed, 10 Mar 2021 00:08:47 +0000 (-0500)
Subject: eja: remove the cached product_on_basis() TODO.
X-Git-Url: https://gitweb.michael.orlitzky.com/?a=commitdiff_plain;h=8d91b5b5af605dabe11a024ab030f2fcb2828cde;p=sage.d.git

eja: remove the cached product_on_basis() TODO.

Storing the multiplication table in a list is actually faster than the
@cached_method dict lookup. I tried it. In general, l[i][j] is about
twice as fast as d[(i,j)] for a nested list "l" and dict "d".
---

diff --git a/mjo/eja/TODO b/mjo/eja/TODO
index 07c85b5..26ff1e9 100644
--- a/mjo/eja/TODO
+++ b/mjo/eja/TODO
@@ -11,20 +11,14 @@ sage: a0 = (1/4)*X[4]**2*X[6]**2 - (1/2)*X[2]*X[5]*X[6]**2 - (1/2)*X[3]*X[4]*X[6
    15-dimensional QuaternionHermitianAlgebra(3)) to find out why
    they're so slow.
 
-4. Instead of storing a basis multiplication matrix, just make
-   product_on_basis() a cached method and manually cache its
-   entries. The cython cached method lookup should be faster than a
-   python-based matrix lookup anyway. NOTE: we should still be able
-   to recompute the table somehow. Is this worth it?
-
-5. What the ever-loving fuck is this shit?
+4. What the ever-loving fuck is this shit?
 
        sage: O = Octonions(QQ)
        sage: e0 = O.monomial(0)
        sage: e0*[[[[]]]]
        [[[[]]]]*e0
 
-7. Every once in a long while, the test
+5. Every once in a long while, the test
 
        sage: set_random_seed()
        sage: x = random_eja().random_element()