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setClass("B", representation=representation("B", extra="numeric)) setClass("B", representation=representation(extra="numeric"), contains="B") Are these the same? If not, how do they differ? What about setClass("B", representation=representation("B", extra="numeric"), contains="B") ? As far as I can

Hi How do I specify an S4 class with a slot that is potentially numeric, but NA by default? I want the slot to be NA until I calculate its value (an expensive operation, not needed for all applications). When its value is known, I will create a new object with the correct value inserted in the slot. I want "NA" to signify "not known". My attempt fails because

Hello, I am trying to improve my skill on S4 classes. But there's something strange (to me) happening with "initialize" methods. This is probably a normal behaviour... but... something is unclear in my mind I declare two classes, namely "A", and "B", which has a slot of type A. The class "A" has an initialize method. What I do not understand is that

...gt;>  ret i32 %2 >> } >> >> This is very strange - what is 0x400928F5C0000000 ??? >> the 32 bit hex representation of 3.145 is 0x404947ae, and, >> the 64 bit hex representation of 3.145 is 0x400928f5c28f5c29 > > For murky historical reasons, float literals are represented as > if they were doubles, but with the precision of a float.  It does > not change their semantics. But what is 0x400928F5C0000000? it is NOT the 64 bit representation with the low order 32 bits zeroed - it is the 62 bit representation with the low order 28 bits zeroed. Why 28 bits? - 32...

Hi! Consider this code. setClass("Ctest" ,representation( test="character" ,bla="character" ,mod="lm" ) ) new("Ctest",test="bla") #This produces an error. #Error in validObject(.Object) : Invalid "Ctest" object: Invalid object for slot "mod" in class "Ctest": got class

Nobody in this long thread appears to have yet explained why it's a bad idea to allow atomic fragments of code/data (whatever you want to call them: atoms, sections, who cares) to have more than one global symbol attached to them in LLD's internal representation. That seems like it'd provide the flexibility needed for ELF without hurting MachO. If that change'd allow you to avoid

Dear List, consider the following scenario: setClass(Class = "A", representation = representation(B = "B", C = "C")) setClass(Class = "B", representation = representation(C = "C")) setClass(Class = "C", representation = representation(something = "character")) Obviously, the collation for sourcing these defs needs to be: C,

...as the std.for/if (currently misnamed > as loop.for/loop.if) are actually a loop tree. The affine ops are just an > affine loop AST isomorphic to the materialization of polyhedral > domains/schedules via code generation. Every IST AST or the output of > polyhedral code generation can be represented in the affine dialect and > vice versa. MLIR's loop/if ops are a hierarchy rather than a flat form / > list of blocks CFG. > As per my discussion with Chris Lattner, this is a very subjective question. It might be controversial, but I don't see MLIR regions as much more than synt...

> > Okay, it's just not immediately undefined behaviour. The C model has more > issues because of the problem with how "trap representation" is defined > (which precludes trap representations for unsigned char, two's complement > signed char, etc.). This interpretation is further stressed because C only explicitly ascribes > undefined behaviour to trap

...rams that use lots of global variables, or call lots of external functions. This shouldn't fundementally change the interface at all. 2. The heuristics can be improved slightly, improving the quality of the generated graphs. Basically, right now if something happens that cannot be represented in the graph, the node in question is collapsed, losing all field sensitivity. Because some "features" are not implemented yet, this happens in a couple cases where it shouldn't. In particular, the following programs graphs will improve: Olden-tsp, Olden-vornoni - Struct...

This is an RFC to add analyses and transformation passes into LLVM to optimize programs based on an abstract notion of a parallel region. == this is _not_ a proposal to add a new encoding of parallelism == We currently perform poorly when it comes to optimizations for parallel codes. In fact, parallelizing your loops might actually prevent various optimizations that would have been applied

Hi everybody! I'm creating an object of a S4 class that has two slots: ListExamples, which is a list, and idx, which is an integer (as the code below). Then, I read a data.frame file with 10000 (ten thousands) of lines and 10 columns, do some pre-processing and, basically, I store each line as an element of a list in the slot ListExamples of the S4 object. However, many operations after this

leledumbo, from what you say, I assume you have some kind of representation (AST or a lower-level intermediate representation) from which you generate LLVM assembly. Is this representation in SSA form? If it is, you might want to do a "copy propagation" transformation that replaces the uses of all variables that are assigned a constant value by their definitions. Example: x = 5 y =

Hi, I am trying to create a linked list in R by defining a class Node which has a instance variable Node. setClass("Node", representation(rate="numeric", nextNode="ANY")) The above works. But the following gives me a warning message. setClass("Node", representation(rate="numeric", nextNode="Node")) > >

I'm trying to create a package for working on orientation data, i.e. data where the observations are 3D rotations. There are several different representations of orientations in common use: SO(3) matrices, Euler angles, unit quaternions, etc. One thing I'd like is to make it convenient to work in any representation, and have conversions to others done as needed. I'm trying to do

I am interested in studying the binary representation of numerics (doubles) in R, so am looking for possibilities of output of the internal binary representations. sprintf() with format "a" or "A" is halfway there: sprintf("%A",pi) # [1] "0X1.921FB54442D18P+1" but it is in hex. The following illustrate the sort of thing I want: 1.1001 0010 0001 1111

Hi the list. I try to learn the S4 programming. I find the wiki and several doc. But I still have few questions... 1. To define 'representation', we can use two syntax : - representation=list(temps = 'numeric',traj = 'matrix') - representation(temps = 'numeric',traj = 'matrix') Is there any difference ? 2. 'validityMethod' check the

Hi, Short story ----------- setClassUnion("ArrayLike", "array") showClass("ArrayLike") # no slot setClass("MyArrayLikeConcreteSubclass", contains="ArrayLike", representation(stuff="ANY") ) showClass("MyArrayLikeConcreteSubclass") # 2 slots!! That doesn't seem right. Long story ----------

Dear all, I just have identified the following issue which I believe could be a bug in R: Let me illustrate: First, enable the display of fractional seconds and check that it works: > options(digits.secs = 6, digits = 6) > as.character(as.POSIXct("2018-08-31 14:15:16.123456")) [1] "2018-08-31 14:15:16.123456" Now create a sequence of POSIXct with stepwidth 0.1sec:

Hi all, I am having a problem trying to declare a slot representation to hold a file connection. With V2.8.0 I had been using: setClass("Element", representation( [other slots removed], datafileConn = setOldClass(c("file","connection")) ) ) This resulted in a warning but still ran okay. No however with V2.9.0 I am getting