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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 17:32:07 -0400 |

Yes, Stas, this is very close to what I want, though -quadsum()- is using quad precision reals (float=4, double=8, quad=16 bytes), while for me 64-bit integers (8 bytes) are sufficient. And importantly, in Stata 9. http://en.wikipedia.org/wiki/Quadruple-precision_floating-point_format http://en.wikipedia.org/wiki/Int64 Sergiy. On Thu, Jun 13, 2013 at 5:20 PM, Stas Kolenikov <skolenik@gmail.com> wrote: > I guess at least a part of Sergiy's question is, "Can the mere mortals > like himself use the quad type that is obviously out there in Mata, as > all of the -quadsum()- and the like functions provide at least some > interface to this type?" > > > -- 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 3:55 PM, Sergiy Radyakin <serjradyakin@gmail.com> wrote: >> 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/ > * > * 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/

**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>

**Re: 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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