unable to convert ... to a symbolic expression

asked 2023-06-05 18:48:50 +0100

187 ●2 ●8 ●24

Why does this error out?

abc,ABC=var('abc ABC')
aa=[abc^2,ABC];print(aa)
SR(aa[0:1])

After a lot of reporting

TypeError: unable to convert [abc^2, ABC] to a symbolic expression

The original problem was trying to access the ideal .. groebner_basis()
The Groebner part worked but I want to manipulate the output, and I got this error. So far, this code fails on 9.7, 9.8, 10.0 A pointed reference would be fine sorry

answered 2023-06-05 19:11:15 +0100

Max Alekseyev

6488 ●9 ●47 ●153

aa[0:1] is a list composed of just one element. Conversion of a list into SR in not defined. Do you mean SR(aa[0]) by any chance?

As for groebner_basis(), it's unclear why do you need symbolic expressions as ideals and Groebner bases are defined over polynomial rings, and typically do not require any conversion to symbolic ring.

edit flag offensive delete link

Comments

Your right and I finally extracted that from the incoming :)
Your question is relevant.
construct an aa=ideal(...).groebner_basis()
Then try
solve(aa, for_this_or that)
It will fail; whereas print(aa) and copy/paste on screen and it works. If that is not clear, I will shrink my problem and post an example. Obviously, I want to automate that:)

rrogers ( 2023-06-05 23:49:47 +0100 )edit

Typically one won't need to use solve() function while working with polynomial ideals. Use .variety() method instead.

Max Alekseyev ( 2023-06-06 05:58:20 +0100 )edit

add a comment

Your Answer

Please start posting anonymously - your entry will be published after you log in or create a new account.

unable to convert ... to a symbolic expression

1 Answer

Comments

Your Answer

Question Tools

Stats

Related questions

unable to convert ... to a symbolic expression edit

1 Answer

Comments

Your Answer

Question Tools

Stats

Related questions

unable to convert ... to a symbolic expression