Re: Slowup in 2.1.54

[David Bateman]

According to John W. Eaton <address@hidden> (on 02/18/04):
> On 18-Feb-2004, David Bateman <address@hidden> wrote:
> 
> | So to me the problem is clearly in the concatenation operations, not
> | the recursion. Interestingly the above allows an estimate of the slowup
> | in the concatenation operation to be derived as
> | 
> | (40.233 - 2.6302) / (6.1742 - 2.9223) = 11.563
> | 
> | So there is a factor of roughly 11 slowup in the concatenation operations.
> 
> I think the following change should help.
> 

2.1.50:
tic; for n=1:1000; bm_x=sylvester_matrix(7) ; endfor ; toc
ans = 6.1763

2.1.54+patch:
tic; for n=1:1000; bm_x=sylvester_matrix(7) ; endfor ; toc
ans = 6.6461

Now I'm happy :-)

Cheers
David

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David Bateman                                address@hidden
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