[This message was posted by Rolf Andersson of Pantor Engineering <[email protected]> to the "FAST Protocol" discussion forum at http://fixprotocol.org/discuss/46. You can reply to it on-line at http://fixprotocol.org/discuss/read/eaf4505e - PLEASE DO NOT REPLY BY MAIL.]
that depends on the field definition. type? operators? inital value? please be more specific /Rolf > Rolf, > > Oh I made a mistake that I think mantissa is optional. so the value is > decreased by 1. > > I want to know how to handle if a field is absent. > > Michael > > > > Rolf, > > > > > > I am sorry I got confused again. For tag 271, the pmap bit is 0. so > > > the default value 0 is used for exponent. Can we say that the > > > exponent has a value so that we need to decode mantissa? If so, the > > > encoded value is 0x82 for the mantissa. The decoded value should be > > > 1 since it is delta operator, Right? > > > > Yes, 0x82 is for the mantissa. No, the decoded mantissa value is 2. > > Why do you think the value should be 1? > > > > > BTW, if the length field of a sequence field is greater than 1, does > > > the sequence pmap appear each iteration? > > > > yes, as noted in my mail below > > > > (FAST 1.1 spec section 6.2.5 says: "If any instruction of the group > > needs to allocate a bit in a presence map, each element is represented > > as a segment in the transfer encoding." "element" in this context is > > synonymous with my use of "iteration" in my mail below) > > > > /Rolf > > > > ... snip ... > > > > >> Michael, > > >> > > >> The pmap entry for the length field is located in the _message_ > > >> level pmap (bit 7 in this case). The sequence level pmap occurs for > > >> every iteration (repetition) of the sequence and provides presence > > >> info for the fields in the current iteration. [You can unsubscribe from this discussion group by sending a message to mailto:[email protected]] --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Financial Information eXchange" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/FIX-Protocol?hl=en -~----------~----~----~----~------~----~------~--~---
