similar to: How to handle INT8 data

Well I definitely cannot use them as numeric because join is the main reason of those identifiers. About int64 and bit64 packages, it's not a solution, because I am releasing a dataset for external users. I cannot ask them to install a package in order to exploit them. I have to be very carefull when releasing the data. If a user just use read.csv functions, they by default cast the

Right, they are identifiers. Storing them as String has drawbacks: - huge to store in memory - slow to process - huge to index (by eg data.table columns indexes) Why not storing them as numeric ? Thanks, Le 20 janv. 2017 ? 18h16, William Dunlap ?crivait : > If these are identifiers, store them as strings. If not, what sort of > calculations do you plan on doing with them? > Bill

Hi, I do have < INT_MAX. This looks attractive but since they are unique identifiers, storing them as factor will be likely to be counter-productive. (a string version + an int32 for each) I was looking to https://cran.r-project.org/web/packages/csvread/index.html This looks like a good feet for my needs. Any chances such an external package for int64 would be integrated in core ? Le 20

To summarise this thread, there are basically three ways of handling int64 in R: * coerce to character * coerce to double * store in double There is no ideal solution, and each have pros and cons that I've attempted to summarise below. ## Coerce to character This is the easiest approach if the data is used as identifiers. It will have some performance drawbacks when loading and will

2^53 == 2^53+1 TRUE Which makes joining or grouping data sets with 64 bit identifiers problematic. Murray (mobile) On Jan 20, 2017 9:15 AM, "Nicolas Paris" <nicolas.paris at aphp.fr> wrote: Le 20 janv. 2017 ? 18h09, Murray Stokely ?crivait : > The lack of 64 bit integer support causes lots of problems when dealing with > certain types of data where the loss of precision

How many unique idenfiiers do you have? If they are large (in terms of bytes) but you don't have that many of them (eg the total possible number you'll ever have is < INT_MAX), you could store them as factors. You get the speed of integers but the labeling of full "precision" strings. Factors are fast for joins. ~G On Fri, Jan 20, 2017 at 9:47 AM, Nicolas Paris

The lack of 64 bit integer support causes lots of problems when dealing with certain types of data where the loss of precision from coercing to 53 bits with double is unacceptable. Two packages were developed to deal with this: int64 and bit64. You may need to find archival versions of these packages if they've fallen off cran. Murray (mobile phone) On Jan 20, 2017 7:20 AM, "Gabriel

I am not on R-core, so cannot speak to future plans to internally support int8 (though my impression is that there aren't any, at least none that are close to fruition). The standard way of dealing with whole numbers too big to fit in an integer is to put them in a numeric (double down in C land). this can represent integers up to 2^53 without loss of precision see (

Hi Devs, Consider below testcase. $cat test.cpp #include <vector> #include<type_traits> typedef int _int4 __attribute__((vector_size(16))); typedef union{ int data[4]; struct {int x, y, z, w;}; _int4 vec; } int4; typedef int4 int3; int main() { static_assert(std::alignment_of<int4>::value <= alignof(max_align_t), "over aligned!"); } $clang++ -m32 error:

The new pragmatic Rails Cookbook has a drag and drop sorting recipe. Does anyone know if this works with 1.0? I''ve followed the recipe (i think), and I can drag but when I drop everything goes back the way it was. It seems that the sort logic doesn''t get invoked. I put this code in my view: <%= sortable_element ''task-list'' , :url => {

Hi, I am trying to use the update_attributes on object with nested attributes and I am getting the following error: ProductPrice expected, got HashWithIndifferentAccess Here''s the situation (simplified): class Product < ActiveRecord::Base belongs_to :productPrice end class ProductPrice < ActiveRecord::Base has_one :product, :dependent => true

Hi, PDC works fine, but Samba BDC doesn't make its job. In srvmgr.exe PDC, BDC appear, but when I kill smb PDC's process, normaly BDC may give a response to smb request. My problem... BDC do not respond, no PDC :: no authentification. any idea. my smb.conf : [global] # Main Config. netbios name = LYS workgroup = TNN server string = Lys (TNN's PDC) security = user domain

Playing around with calling conventions naked functions and epilogue/prologue... Is it possible/expressible/feasible to alter the return address the function will return to? For example, when a function may return an Int8 or a Float64, depending on some external state (user, or random variable), instead of checking the returned type in the calling function, is it possible to pass 2 potential

Dear list, Being new to both the postgres database, ODBC and the RODBC interface, I am somewhat confused by some of the problems I am experiencing trying to connect R to the database. Whai I am trying is basically the example part of the help file for the sqlSave function: > library(RODBC) > odbcConnect("theodor") -> channel > data(USArrests) > sqlSave(channel,

All of the tutorials and the Agile book use MySQL and I''ve got that working. I am now trying to use PostgreSQL and can''t seem to get going. Is my problem the db setup in postgresql? I have installed postgres-pr The error message when I try to access http://localhost:3000/clients when using PostgreSQL (MySQL works fine) ActiveRecord::StatementInvalid (RuntimeError: ERROR

After chatting on IRC, Peter wants a very specific interrupt (int4 on x86). I suggested he add a new llvm.x86.int(i32) intrinsic, and use the existing branch on llvm.sadd.with.overflow intrinsic. The x86 backend can then turn jo+int4 into into when reasonable. -Chris On Aug 9, 2010, at 5:45 PM, Chris Lattner wrote: > > On Aug 9, 2010, at 10:44 AM, Peter S. Housel wrote: > >>

On 3 November 2013 05:44, Sean Silva <chisophugis at gmail.com> wrote: > LLVM doesn't provide a runtime or "VM". You basically do these things the > same way that you do them in C. Yes, this unfortunately requires knowing > your target platform's system libraries and how to link to them and such; > LLVM doesn't paper over this. OK. So to be specific, I am

On 08/26/2011 05:32, Stephan Falke wrote: > As stated in LLVM's language reference manual > (http://llvm.org/docs/LangRef.html#i_shl), both arguments for a shl need > to have the same type. In my case, original types were uint8 (value) and uint32 (shift) llvm lacks unsigned types which made it S1=i8 and S2=i32. It's technically nothing wrong with such combination, and code works

On Aug 9, 2010, at 10:44 AM, Peter S. Housel wrote: > Several instruction set architectures include arithmetic operations that can trap on overflow, or support this feature with a separate trap-on-overflow-flag instruction (such as the x86 INTO instruction). > > > I am adding a back-end to the Open Dylan compiler to generate LLVM IR. The original back-end, which generates x86

Hi, I've read http://llvm.org/docs/LangRef.html#t_array and http://llvm.org/docs/GetElementPtr.html and if I've understood right there are no operations that act directly on arrays - instead I need to use getelementptr on a pointer to an array to get a pointer to an array element. I also understand that there is no 'address of' operation. As a result I can't figure out how to