thelamecamel wrote:
> On Mar 3, 4:46 am, Jason Grout <[email protected]> wrote:
>> You are missing a closing bracket and comma at the end of this line
>> (i.e., "],"). The number looks a little smaller as well. Was something
>> chopped off?
>>
>> Jason
>
> Oh man, that's what's happening. When I print another failing string
> from mathematica, the original string looks fine, but the replace()d
> version is munged:
> 8.553921460041636*^-14 - 0.034517073945669455*I,
> 6.438460875557439*^-13 - 0.2507643434931489*I,
> becomes
> 8.553921460041636e-14 - 0.0 6.438460875557439e-13 -
> 0.2507643434931489*I,
> And of course, when I try to sage_eval the latter, it fails. So this
> seems to be a problem with replace().
>
> This all happens inside a loop, and doesn't happen when I try it out
> of that loop (except with really long inputs, so the code to reproduce
> it isn't as simple as I would have liked.
>
> First, download http://www.physics.usyd.edu.au/~felix/sage/res.m
> Save the file somewhere.
> Then run:
> sage: mathematica('SetDirectory["/path/to/file"]')
> sage: mathematica("<< res.m")
> sage: res = mathematica('res')
> sage: for i in range(84):
> ....: resel_s = repr(res[i+1][1]).replace('{','[').replace
> ('}',']').replace('*^','e').replace('\n',' ')
> ....: resel = sage_eval(resel_s)
> ....:
> ------------------------------------------------------------
> File "<string>", line 1
> [[-RealNumber('0.9018796952509034') + RealNumber
> ('0.9018804701526122')*I,
> <SNIP>
> SyntaxError: invalid syntax
>
> Run the loop three times in the same sage session, and on the third
> time you'll get the error occurring in a different place in the loop.
> Weird!
>
> Any ideas?
My guess is it is a problem with the pexpect interface with Mathematica.
There is some way to turn on logging of the pexpect interface to see
exactly what Sage is sending and receiving from Mathematica; you'll
probably see the problem there. I don't know how to turn it on; I've
never used it. Can anyone help with that?
(Sorry; at the moment I am pressed for time, otherwise I'd go figure out
how to turn it on.)
Jason
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