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From |
Sergiy Radyakin <serjradyakin@gmail.com> |

To |
"statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu> |

Subject |
Re: st: Mata buffered read 64-bit integer (8 byte/int64), how? |

Date |
Thu, 13 Jun 2013 16:55:55 -0400 |

Thank you, Stas, this is what I am doing now. Storage in a struct (or in my case simply in two real variables) is not a problem. The problem starts when you need one (LARGE) value, then x=x1*2^32+x2 becomes already lossy, since (as the manual says) : "Doubles can store up to 9,007,199,254,740,991 exactly". Not that I would expect anyone to have files that big :) but formally I want to be on the safe side and I didn't expect a problem having 64-bit integers in (at least) 64-bit Stata. Sergiy On Thu, Jun 13, 2013 at 4:48 PM, Stas Kolenikov <skolenik@gmail.com> wrote: > You can probably define the -struct-ure that could store such strings, > and convert them into numbers for arithmetic operations. Bill Gould > may have had an article on this in Stata Journal -- the generic use of > structures is described in > http://www.stata-journal.com/sjpdf.html?articlenum=pr0035. Coding > matrix multiplication with these elements will quickly become an > overkill :-\. > > -- Stas Kolenikov, PhD, PStat (SSC) > -- Senior Survey Statistician, Abt SRBI > -- Opinions stated in this email are mine only, and do not reflect the > position of my employer > -- http://stas.kolenikov.name > > > > On Thu, Jun 13, 2013 at 3:12 PM, Sergiy Radyakin <serjradyakin@gmail.com> wrote: >> I read a 32-bit integer value from a buffered file with d=fbufget(C,fh,"%4bu"). >> >> How do I read a 64-bit integer from the same file when Mata does not >> support format "%8bu"? And what can be the type of the LHS (type of >> variable d above) to accommodate the result of the read without the >> loss of information (double is not good, not sure about quad >> precision). >> >> I can read it as 8-bytes string, or 8 individual bytes, but I also >> need to work with the result as a value in Mata. So looking for a >> convenient solution. >> >> Thank you, >> Sergiy >> * >> * For searches and help try: >> * http://www.stata.com/help.cgi?search >> * http://www.stata.com/support/faqs/resources/statalist-faq/ >> * http://www.ats.ucla.edu/stat/stata/ > * > * For searches and help try: > * http://www.stata.com/help.cgi?search > * http://www.stata.com/support/faqs/resources/statalist-faq/ > * http://www.ats.ucla.edu/stat/stata/ * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/faqs/resources/statalist-faq/ * http://www.ats.ucla.edu/stat/stata/

**Follow-Ups**:**Re: st: Mata buffered read 64-bit integer (8 byte/int64), how?***From:*Stas Kolenikov <skolenik@gmail.com>

**References**:**st: Mata buffered read 64-bit integer (8 byte/int64), how?***From:*Sergiy Radyakin <serjradyakin@gmail.com>

**Re: st: Mata buffered read 64-bit integer (8 byte/int64), how?***From:*Stas Kolenikov <skolenik@gmail.com>

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