0004170: pi constant

(0007499)
garrigue (manager)
2012-06-01 10:15

My standard code for pi is acos(-1.)
Is this too long?

(0007501)
Richard Jones (reporter)
2012-06-01 11:23

Since you ask ...

Is acos(-1.) the most accurate pi considering either the IEEE representation or the longer internal representation used by x86?

I know that glibc defines this constant carefully so that the most accurate pi is used. (glibc also provides long-double -- 128 bit -- variants but I guess we can't use those in OCaml).

(0008355)
warwick (reporter)
2012-10-29 13:58

I suggested a similar thing in issue 005173. I think having a predefined value "pi" is a lot clearer than having to write acos(-1.) ... or acos(-.1.)

Issue History
Date Modified	Username	Field	Change
2006-11-25 14:53	Richard Jones	New Issue
2007-11-10 13:14	xleroy	Status	new => acknowledged
2012-06-01 10:15	garrigue	Note Added: 0007499
2012-06-01 10:15	garrigue	Assigned To	=> garrigue
2012-06-01 10:15	garrigue	Status	acknowledged => feedback
2012-06-01 11:23	Richard Jones	Note Added: 0007501
2012-06-01 11:23	Richard Jones	Status	feedback => assigned
2012-10-29 13:58	warwick	Note Added: 0008355

Notes
(0007499) garrigue (manager) 2012-06-01 10:15	My standard code for pi is acos(-1.) Is this too long?

(0007501) Richard Jones (reporter) 2012-06-01 11:23	Since you ask ... Is acos(-1.) the most accurate pi considering either the IEEE representation or the longer internal representation used by x86? I know that glibc defines this constant carefully so that the most accurate pi is used. (glibc also provides long-double -- 128 bit -- variants but I guess we can't use those in OCaml).

(0008355) warwick (reporter) 2012-10-29 13:58	I suggested a similar thing in issue 005173. I think having a predefined value "pi" is a lot clearer than having to write acos(-1.) ... or acos(-.1.)

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