Hi Shing,
You can actually make HTTP calls to the Sage notebook using Robert
Bradshaw's simple API. For example, the following is a (condensed)
Python script which authenticates with a running Sage notebook.
import urllib, re
def get_url(url):
h = urllib.urlopen(url); data = h.read(); h.close(); return data
session = None
def sage(expression, host="localhost", passwd = "passwd", port = 8000):
global session
if session is None:
login_page =
get_url('http://%s:%s/simple/login?username=admin&password=%s' %
(host, port, passwd))
session = re.match(r'.*"session": "([^"]*)"', login_page,
re.DOTALL).groups()[0] #extract the sessionid from the result
expression = urllib.quote(expression)
res = get_url('http://%s:%s/simple/compute?session=%s&code=%s' %
(host, port, session, expression))
return res
def test_equality(expr1, expr2):
res = sage("bool( %s == %s)"%(expr1, expr2))
dictionary, res = res.split("___S_A_G_E___")
res = res.strip()
return True if res == "True" else False
The function 'sage' takes in a Sage expression and returns the result
as a string. You can look at sage/server/simple/twist.py for more
examples of how this is used. Doing the same thing from Java wouldn't
be difficult.
--Mike
On Sat, Jul 19, 2008 at 2:24 PM, Shing <[EMAIL PROTECTED]> wrote:
>
> I have upgraded to 3.0.5. Now the time taken to run the factor script
> is down to 2s (with 3.0.3 it was 12s)
> I am trying to call Sage from a Java web application. So far the only
> way I know is to do it indirectly by running
> a sage script from Java. Is there a more directly way of calling Sage
> from Java ?
> The factor script is just a test. In general, my sage script would do
> different computation.
>
> Thanks!
> Shing
>
>
>
> On Jul 19, 1:45 pm, "William Stein" <[EMAIL PROTECTED]> wrote:
>> On Sat, Jul 19, 2008 at 1:53 PM, Shing <[EMAIL PROTECTED]> wrote:
>>
>> > Hi,
>> > I have tried the standalone Python/Script at
>> >http://www.sagemath.org/doc/html/tut/node55.html
>>
>> > to factorize a number.
>>
>> > #!/usr/bin/env sage
>>
>> > import sys
>> > from sage.all import *
>>
>> > if len(sys.argv) != 2:
>> > print "Usage: %s <n>"%sys.argv[0]
>> > print "Outputs the prime factorization of n."
>> > sys.exit(1)
>>
>> > print factor(sage_eval(sys.argv[1]))
>>
>> > The script takes about 12s to factories 2006. But in the notebook,
>> > it takes less than 1 second.
>> > I would like to use a standalone script from command line to do some
>> > computation. Is there a way to speed it up ?
>>
>> > I am using Sage 3.0.3 on a Athlon 3200 64bit PC, running OpenSuse 11.
>>
>> > Thanks in advance for any assistance!
>>
>> The Sage startup time in sage-3.0.5 is better than in 3.0.3, so you might
>> want to try upgrading. Are you *just* factoring integers are do you plan
>> to do much more? This is fast:
>>
>> teragon-2:~ was$ time echo "factor(2006)" | sage -gp
>> GP/PARI CALCULATOR Version 2.3.3 (released)
>> i386 running darwin (ix86/GMP-4.2.1 kernel) 32-bit version
>> compiled: May 4 2008, gcc-4.0.1 (Apple Inc. build 5465)
>> (readline v5.2 enabled, extended help available)
>>
>> Copyright (C) 2000-2006 The PARI Group
>>
>> PARI/GP is free software, covered by the GNU General Public License, and
>> comes WITHOUT ANY WARRANTY WHATSOEVER.
>>
>> Type ? for help, \q to quit.
>> Type ?12 for how to get moral (and possibly technical) support.
>>
>> parisize = 4000000, primelimit = 500000
>> %1 =
>> [2 1]
>>
>> [17 1]
>>
>> [59 1]
>>
>> Goodbye!
>>
>> real 0m0.388s
>> user 0m0.033s
>> sys 0m0.051s
>>
>> -- William
> >
>
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