<t>QuoteOriginally posted by: CuchulainnI suppose - like STL vectors - that this memory is all continguous?Yes. And in fact, if you're willing to use unsafe code, you can access it as a block by using Marshal.UnsafeAddrOfPinnedArrayElement to get the address of the first element and then performing ...

<t>QuoteOriginally posted by: CuchulainnGovert,Maybe JIT does a lot for you regarding removing bounds checking??QuoteI even changed the lookups in C# to use unsafe pointers in an attempt to remove bounds checking, and it was still slower.It's my understanding that the JIT is pretty good at hoisting ...

QuoteOriginally posted by: CuchulainnIn Visual Studio, 10^9 trials (rough estimates)A. Debug modeMy: 3 secondsMS: 31 secondsB. Release modeMy: 1.65 secondsMS: 1.65 secondsI believe the JIT's inlining is turned off for debug mode.

Out of curiousity, how does your test compare between running 32-bit and 64-bit? At least with CLR4, the JIT seems to use sqrtsd instead of fsqrt .

<r>If you're using IronPython, you might be interested in Sho:<URL url="http://research.microsoft.com/sho%22Sho">http://research.microsoft.com/sho"Sho</URL> is an interactive environment for data analysis and scientific computing that lets you seamlessly connect scripts (in IronPython) with compiled...

All 64-bit versions of Windows -- XP, Vista and Win7 -- effectively ship with both the 32-bit and 64-bit versions of the user-mode Windows DLLs. I used 64-bit Windows XP for well over a year and never had any trouble running 32-bit software which ran successfully on 32-bit XP.

Out of curiousity, have you made any further progress on this?

This isn't the entirety of your source code, is it? I don't see where the DllGetClassObject is implemented. And what are you doing to stick this thing into the registry?Assuming you're using MSVC, it's insane not to use ATL to implement COM objects.

Can you provide a more-specific error message or information? Is this an undefined symbol from the linker? Or is it the post-build registration that's failing?

QuoteOriginally posted by: HorseRiderNow I tried to add another row with same data.aRow = c(2, "aa", TRUE)rbind(df, aRow)rbind doesn't update its argument; it returns a new data frame. You need to reassign the result back to df:df = rbind(df, aRow)

<t>QuoteOriginally posted by: HansiThat was the first thing I tried but it didn't work with that either. Also IronPython docs say that the CWD is always part of sys.path.Dino says "I don't think [this behavior] is intentional. We actually have a bug to remove . from the sys.path when we're not in in...

<t>Hmmm... worked for me.PS C:\> type test\x.csusing System;namespace ClassLibrary1{public class Class1{public static int AddOne(int n){return ++n;}}}PS C:\> & 'C:\Program Files (x86)\IronPython 2.6 for .NET 4.0\ipy.exe'IronPython 2.6.2 (2.6.10920.0) on .NET 4.0.30319.1Type "help", "copyright", ...

The "current directory" isn't part of the search path for AddReference. You could sys.path.append the directory or you could use clr.AddReferenceToFileAndPath and give a full path name.

<t>QuoteOriginally posted by: renormI see. What is the learning curve if I want to offer my C++ libraries to C# users? Basis C# syntax and some subset of C++/CLI?The main issue is figuring out how to marshal data efficiently between native and managed code. This is easy for simple scalar types and r...

QuoteOriginally posted by: renormDoesn't it mean I can access all the fancy C++ stuff from C#? What are the limits? Will CLI work with my SSE library?Sure. I've used C++/CLI to wrap MKL for use from C#.