If i type in the following
R.<z1,z2> = PolynomialRing(GF(5),2,"z")
direclty to Sage it accepts it as a polynomial ring.
But if i place this in a .py file and load it from this Sage
eg sage my.py it gives me a syntax error.
I guess i need a module loaded for it to be detected, but which module and hence which command do i need to make Sage accept this ring.
I agree, this is hard to read (probably a candidate for "What is broken on this site"). Having said that, I think the question is:
What module do I need to import in my
.pyfile so that the above syntax works as expected?
I guess I don't know this answer, but maybe a workaround: The .< > notation is a shortcut for
R = PolynomialRing(ZZ,2,'z1,z2')
(z1,z2) = R.gens()
and the latter works when loaded from a .py file.
The answer; it is impossible to make the notation:
R.<z1,z2> = ZZ[]
work in a .py file, since .py files must be valid Python, and the above isn't. The workaround by niles above is the way to go.
I tried to edit and get a big traceback -- there my thus be a bug in askbot that prevents editing some posts.
Oh, to use the PolynomialRing command in a .py file, do from sage.rings.all import PolynomialRing
Rename your file to my.sage
Then, when you run sage my.sage it will be automatically preparsed. A my.py with all the needed extra python code will be produced and loaded automatically.
For reference, see also the answers to later Ask Sage questions:
Asked: 2010-08-19 11:41:02 +0100
Seen: 1,597 times
Last updated: Dec 09 '17
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Could you please edit your question? There are html escaping errors in it. Notice the ampersand gt semicolon? I see the command, but I don't see a question mark or a question in what you originally typed. Thanks.