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> -----Original Message----- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On > Behalf Of Ethan A Merritt > Sent: 23 September 2005 06:15 > To: [EMAIL PROTECTED]; [email protected] > Subject: Re: [ccp4bb]: Ends of proteins > > *** For details on how to be removed from this list visit the *** > *** CCP4 home page http://www.ccp4.ac.uk *** > > > On Thursday 22 September 2005 07:00 pm, you wrote: > > > > What is the largest B factor that can be registered in a pdb file? > > Well, let's see... The PDB file format says B occupies columns 61-66, > and it's parsed as a real number with format F6.2. > > If you actually stuck to that format then the largest value is 999.99, > but since code is in practice likely to parse this as any legal > float that fits into 6 columns, I'd bet that most programs would > manage to read in 99E307 (99 x 10**307). This would overflow 64-bit IEEE (the max double is 1.7976931348623157E+308) so the best you could manage would be 17E307. Actually this would be true if the code uses a 64-bit IEEE float to store the number, but I bet the majority of Xtal software uses only 32-bit, so the answer in practice is probably 340E36 (max float is 3.40282347E+38). -- Ian ********************************************************************** CONFIDENTIALITY NOTICE This email contains confidential information and may be otherwise protected by law. Its content should not be disclosed and it should not be given or copied to anyone other than the person(s) named or referenced above. If you have received this email in error, please contact [EMAIL PROTECTED] **********************************************************************
