64-bit

问题 I'm using Python 2.7.3 in 64-bit. I installed pandas as well as matplotlib 1.1.1, both for 64-bit. Right now, none of my plots are showing. After attempting to plot from several different dataframes, I gave up in frustration and tried the following first example from http://pandas.pydata.org/pandas-docs/dev/visualization.html: INPUT: import matplotlib.pyplot as plt ts = Series(randn(1000), index=date_range ('1/1/2000', periods=1000)) ts = ts.cumsum() ts.plot() pylab.show() OUTPUT: Axes(0.125

问题 I'm just getting started with Boost for the first time, details: I'm using Visual Studio 2008 SP1 I'm doing an x64 Build I'm using boost::asio only (and any dependencies it has) My code now compiles, and I pointed my project at the boost libraries (after having built x64 libs) and got past simple issues, now I am facing a linker error: 2>BaseWebServer.obj : error LNK2001: unresolved external symbol "class boost::system::error_category const & __cdecl boost::system::get_system_category(void)"

问题 I was creating a virtualenv with a clean install of python 3.3, 64-bit version. (Note: I have several installs of python on my computer including WinPython but want to set up clean and small virtualenvs for several projects that I am working on. The WinPython version works just fine.) When I used pip to try to install packages, I got an error message (can include pip log if requested). Ultimately, the last lines of the error message were: File "c:\python33-b\Lib\distutils\msvc9compiler.py",

问题 I just updated to xcode 5.1 - apple decided to make all apps compile to 64bit by default - My app has some legacy code and I spent the last couple of hours figuring out how to STOP Xcode building for 64bit. Thought this might help people with the same problem... See the accepted answer for a clearer visual walk thought (my original text based answer...) In Targets-->Build Settings-->Architectures-->Architectures select other delete (press '-') $(ARCH_STANDARD) add (press '+') armv7 add (press

问题 I just updated to xcode 5.1 - apple decided to make all apps compile to 64bit by default - My app has some legacy code and I spent the last couple of hours figuring out how to STOP Xcode building for 64bit. Thought this might help people with the same problem... See the accepted answer for a clearer visual walk thought (my original text based answer...) In Targets-->Build Settings-->Architectures-->Architectures select other delete (press '-') $(ARCH_STANDARD) add (press '+') armv7 add (press

问题 I'm having trouble finding the good documentation for writing 64-bit assembly on MacOS. The 64-bit SysV ABI says the following in section A.2.1 and this SO post quotes it: A system-call is done via the syscall instruction. The kernel destroys registers %rcx and %r11. Returning from the syscall, register %rax contains the result of the system-call. A value in the range between -4095 and -1 indicates an error, it is -errno. Those two sentences are ok on Linux but are wrong on macOS Sierra with

问题 When I try to compile a copy of my project on my local machine, I get an error stating that it 's skipping over incompatible libraries. This isn't the case when I'm messing around with the live version hosted on the server at work [it makes perfectly there]. Various other sites have lead me to believe that this might be an environment issue, as I'm developing on a 64-bit distro of Ubuntu and I assume the server version is running on 32-bit. Nevertheless, after setting my environment variables

问题 I've noticed that if I build my WPF application for Any CPU/x64, it takes MUCH longer to start (on the order of about 20 seconds) or to load new controls than it does if started on x86 (in release & debug modes, inside or outside of VS). This occurs with even the simplest WPF apps. The problem is discussed in this MSDN thread, but no answer was provided there. This happens only with .NET 4.0 -- in 3.5 SP1, x64 was just as fast as x86. Interestingly, Microsoft seems to know about this problem

问题 I have read through this SO question about 32-bits, but what about 64-bit numbers? Should I just mask the upper and lower 4 bytes, perform the count on the 32-bits and then add them together? 回答1: You can find 64 bit version here http://en.wikipedia.org/wiki/Hamming_weight It is something like this static long NumberOfSetBits(long i) { i = i - ((i >> 1) & 0x5555555555555555); i = (i & 0x3333333333333333) + ((i >> 2) & 0x3333333333333333); return (((i + (i >> 4)) & 0xF0F0F0F0F0F0F0F) *

问题 I have read through this SO question about 32-bits, but what about 64-bit numbers? Should I just mask the upper and lower 4 bytes, perform the count on the 32-bits and then add them together? 回答1: You can find 64 bit version here http://en.wikipedia.org/wiki/Hamming_weight It is something like this static long NumberOfSetBits(long i) { i = i - ((i >> 1) & 0x5555555555555555); i = (i & 0x3333333333333333) + ((i >> 2) & 0x3333333333333333); return (((i + (i >> 4)) & 0xF0F0F0F0F0F0F0F) *