Under the Sagemath cloud and Windows, I always get 
[ 1  3  3  1]
[ 1  1 -1 -1]
[ 1 -1 -1  1]
[ 1 -3  3 -1]

Under the linux version, I sometimes get
[ 1  3  3  1]
[ 1  0 -3 -1]
[ 1 -3  3  1]
[ 1 -3  3 -5]

I found that when I paste the following command
q = 2
r = 2
s = 2
n = s*(r+1)
d = 3
P = matrix(ZZ, r+2, r+2, lambda u, k: Krawtchouk(r+1, q, k, u))

into sage command line, I will get 

[ 1  3  3  1]
[ 1  1 -1 -1]
[ 1 -1 -1  1]
[ 1 -3  3 -1]

When I load these command from a file "***.py", I will get
[ 1  3  3  1]
[ 1  0 -3 -1]
[ 1 -3  3  1]
[ 1 -3  3 -5]


在 2015年11月9日星期一 UTC+2上午7:34:59,[email protected]写道:
>
> On Sun, 8 Nov 2015, Sihuang Hu wrote: 
>
> > I just used the following commands to construct an matrix: 
> > 
> > q = 2 
> > r = 2 
> > s = 2 
> > n = s*(r+1) 
> > d = 3 
> > P = matrix(ZZ, r+2, r+2, lambda u, k: Krawtchouk(r+1, q, k, u)) 
> > 
> > But sage gives me two different results at different times: 
>
> I was not able to reproduce the error. I tried in two system, about 
> 500,000 tests together. If there is a real heisenbug, it must depend on 
> architechture etc. So Linux or Mac, what processor...? 
>
> -- 
> Jori Mäntysalo 
>

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