On Monday, June 6, 2011 10:54:57 AM UTC-7, kcrisman wrote:
>
> I'm using R matrices to use an R program and then do things with it in
> Sage. For some reason Sage doesn't get the "right" answer for
> matrices above a certain size.
>
> The first one is right (it gives the space that is in the returned
> string) while the second one makes no sense; ZZ='' is what actually
> comes back. But there is no real reason for this - what's special
> about the length? - and doing these in Sage's r_console() gives normal
> results for the matrix.
>
> So I feel like pexpect must be doing something naughty. Does anyone
> have any ideas what might be going on so I can use more data?
>
I tried this experiment: I added spaces to the first string to be
evaluated. When the string has length <= 1024, it seems to work, and when
the string has length > 1024, it doesn't. For example:
sage: s = 'matrix(c(1, 1, 1, 1,' + ' '*987 + '2,2,2,2), ncol=4)'
sage: len(s)
1024
sage: r.eval(s)
' [,1] [,2] [,3] [,4]\n[1,] 1 1 2 2\n[2,] 1 1
2 2'
sage: s = 'matrix(c(1, 1, 1, 1,' + ' '*988 + '2,2,2,2), ncol=4)'
sage: len(s)
1025
sage: r.eval(s)
''
I don't know why, but maybe that can help you track it down.
--
John
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