unable to convert ... to a symbolic expression

187 ●2 ●9 ●25

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 1 year ago

Max Alekseyev

6932 ●9 ●52 ●162

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.

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 ( 1 year ago )

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

Max Alekseyev ( 1 year ago )

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