Zero check for certain numbers fail

philipp7
391 ●7 ●13 ●28

The following zero check yields an error in my copy of Sage (version 9.5):

real_part(log(QQbar((-1)^(1/3)))).is_zero()

The result of the computation should be True. The entire error message can be found here: https://pastebin.com/iYNjuwZJ I also checked the Sage Cell Server and the same error appears there. I could not find anything related on the Trac server. However, since I have no idea what is going wrong here, my search was very limited.

Comments

From the log it seems that your sage is missing maxima. Could you try to run the command maxima(1)?

vdelecroix ( 2 years ago )

maxima(1) works in my installation and gives me a sage.interfaces.maxima.MaximaElement object.

philipp7 ( 2 years ago )

Could you give more details about your setup (operating system, how you did install Sage).

vdelecroix ( 2 years ago )

I install it by calling makeafter cloning form the github repo as described here: https://ask.sagemath.org/question/431... My OS is openSUSE Leap 15.2

philipp7 ( 2 years ago )

Then there was probably a problem in the compilation process. If you want a diagnosis you should post the files $SAGE_ROOT/config.log, $SAGE_ROOT/config.status and possibly the full $SAGE_ROOT/logs/install.log.

vdelecroix ( 2 years ago )

see more comments

sage: (-1)^(1/3) (-1)^(1/3) sage: QQbar((-1)^(1/3)) 0.500000000000000? + 0.866025403784439?*I sage: log(QQbar((-1)^(1/3))) log(0.500000000000000? + 0.866025403784439?*I) sage: real_part(log(QQbar((-1)^(1/3)))) log(1.000000000000000?) sage: real_part(log(QQbar((-1)^(1/3)))).is_zero() True

Comments

BTW : this "triple check" isn't really necessary. Guess why...

Emmanuel Charpentier ( 2 years ago )

add a comment

Your Answer

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

Zero check for certain numbers fail

Comments

1 Answer

Comments

Your Answer

Question Tools

Stats

Related questions

Zero check for certain numbers fail savecancel

Comments

1 Answer

Comments

Your Answer

Question Tools

Stats

Related questions

Zero check for certain numbers fail