absolute value for the ln function

Sha
264 ●11 ●21 ●34

I tried to execute this but could not figure out the absolute value sign correctly

c = var('c')

c=-0.999

N=(sqrt(1-c^2)/Pi)*[2.239539+(c/sqrt(1-c^2))*ln|(0.9*sqrt(1-c^2)-c*0.435889)/(0.9*sqrt(1-c^2)+c*0.435889)|+(1.8*sqrt(0.19)/(0.81-c^2)];N

I need help on the correct symbol for the absolute value for the ln function. Also, how am I to vary the value of c. I know is should use the command for. Example for c=0.999, 0.901, -0.999, then yield the value of N.

Comments

Well...

sage: r.library('fortunes')
sage: r.fortune("'TFM'")

This is all documented in TFM. Those who WTFM don't want to have to WTFM again
on the mailing list. RTFM.
   -- Barry Rowlingson
      R-help (October 2003)

Emmanuel Charpentier ( 5 years ago )

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answered 5 years ago

tmonteil
27483 ●32 ●205 ●519 http://wiki.sagemath.o...

updated 5 years ago

For the absolute value, you should not use |, but the abs() function. By the way:

you should only use parentheses, not brackets that have a different meaning in Python
Pi is not defined in Sage. Do not use pi which is an (exact) symbolic constant, instead, use RR.pi() that is of the same kind as c, a floating-point number (or pi.n() to tell that you want a numerical approximation of pi). Alternatively, define Pi = RR.pi() before your computation.

link

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Thank you for the feedback. I have corrected it and now it works fine. Thanks!

Sha ( 5 years ago )

@Sha -- since this answers your question, please accept the answer (by clicking on the button with a tick mark); this will mark the question as answered in the main list of question on the Ask Sage homepage.

slelievre ( 5 years ago )

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