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by: Yaroslav Bulatov |
last post by:
I made an array of 10 million floats timed how long it takes to sum
the elements, here's what I got (millis):
gcc -O2: 21
Python with numarray: 104
Python with Numeric: 302
java: 325
gcc: 348
Python with Psyco: 1317
Pure Python using sum: 2312
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by: ur8x |
last post by:
Why does this declaration give undefined result:
file1: extern char * p;
file2: char p;
Let's assume p has been initialized, now accessing p...
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by: simkn |
last post by:
Hello,
I'm writing a function that updates an array. That is, given an
array, change each element.
The trick is this: I can't change any elements until I've processed
the entire array. For example, the manner in which I update element 1
depends on several other (randomly numbered) elements in the array.
So, I can't change an element until I've figured out how every element
changes.
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by: Winston Li |
last post by:
In the Brain and Denis' book "The C Programming Language" Section 5.3
"Pointes abd Arrays", a statment goes:
"Any operation that can be achieved by array subscripting can also be done
with pointers."
Then the authors continute with "The pointer version will in general be
faster ...."
My question is why the pointer version would be faster?
Thanks in advance!
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by: yeti349 |
last post by:
Hi, I'm using the following code to retrieve data from an xml file and
populate a javascript array. The data is then displayed in html table
form. I would like to then be able to sort by each column. Once the
array elements are split, what is the best way to sort them? Thank you.
//populate data object with data from xml file.
//Data is a comma delimited list of values
var jsData = new Array();
jsData = {lib: "#field...
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by: Raman |
last post by:
Is there any performance gain in using
*(a+i) instead of a
for declaration
int a
If no then why people call pointers more faster than arrays.
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by: vfunc |
last post by:
If I have a large array 10,000+ elements then how do I reserve memory
for this ? Currently I get a segmentation fault. Dynamic reservation
is good, but allowing a chunk for the program is an acceptable
alternative.
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by: copx |
last post by:
Unforuntately, I know next to nothing about ASM and compiler construction,
and while I was aware of the syntactic differences between pointers and
arrays, I was not aware of this:
http://udrepper.livejournal.com/13851.html
(Yes, it is livejournal, but it is the journal of the glibc maintainer)
I am not sure I really understand this low-level difference between pointers
and arrays, and I do not have the time to learn ASM and compiler...
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by: Immortal Nephi |
last post by:
I would like to design an object using class. How can this class
contain 10 member functions. Put 10 member functions into member
function pointer array.
One member function uses switch to call 10 member functions. Can
switch be replaced to member function pointer array?
Please provide me an example of source code to show smart pointer
inside class. Thanks....
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by: marktang |
last post by:
ONU (Optical Network Unit) is one of the key components for providing high-speed Internet services. Its primary function is to act as an endpoint device located at the user's premises. However, people are often confused as to whether an ONU can Work As a Router. In this blog post, we’ll explore What is ONU, What Is Router, ONU & Router’s main usage, and What is the difference between ONU and Router. Let’s take a closer look !
Part I. Meaning of...
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by: Oralloy |
last post by:
Hello folks,
I am unable to find appropriate documentation on the type promotion of bit-fields when using the generalised comparison operator "<=>".
The problem is that using the GNU compilers, it seems that the internal comparison operator "<=>" tries to promote arguments from unsigned to signed.
This is as boiled down as I can make it.
Here is my compilation command:
g++-12 -std=c++20 -Wnarrowing bit_field.cpp
Here is the code in...
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by: jinu1996 |
last post by:
In today's digital age, having a compelling online presence is paramount for businesses aiming to thrive in a competitive landscape. At the heart of this digital strategy lies an intricately woven tapestry of website design and digital marketing. It's not merely about having a website; it's about crafting an immersive digital experience that captivates audiences and drives business growth.
The Art of Business Website Design
Your website is...
|
by: Hystou |
last post by:
Overview:
Windows 11 and 10 have less user interface control over operating system update behaviour than previous versions of Windows. In Windows 11 and 10, there is no way to turn off the Windows Update option using the Control Panel or Settings app; it automatically checks for updates and installs any it finds, whether you like it or not. For most users, this new feature is actually very convenient. If you want to control the update process,...
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by: tracyyun |
last post by:
Dear forum friends,
With the development of smart home technology, a variety of wireless communication protocols have appeared on the market, such as Zigbee, Z-Wave, Wi-Fi, Bluetooth, etc. Each protocol has its own unique characteristics and advantages, but as a user who is planning to build a smart home system, I am a bit confused by the choice of these technologies. I'm particularly interested in Zigbee because I've heard it does some...
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by: agi2029 |
last post by:
Let's talk about the concept of autonomous AI software engineers and no-code agents. These AIs are designed to manage the entire lifecycle of a software development project—planning, coding, testing, and deployment—without human intervention. Imagine an AI that can take a project description, break it down, write the code, debug it, and then launch it, all on its own....
Now, this would greatly impact the work of software developers. The idea...
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by: isladogs |
last post by:
The next Access Europe User Group meeting will be on Wednesday 1 May 2024 starting at 18:00 UK time (6PM UTC+1) and finishing by 19:30 (7.30PM).
In this session, we are pleased to welcome a new presenter, Adolph Dupré who will be discussing some powerful techniques for using class modules.
He will explain when you may want to use classes instead of User Defined Types (UDT). For example, to manage the data in unbound forms.
Adolph will...
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by: TSSRALBI |
last post by:
Hello
I'm a network technician in training and I need your help.
I am currently learning how to create and manage the different types of VPNs and I have a question about LAN-to-LAN VPNs.
The last exercise I practiced was to create a LAN-to-LAN VPN between two Pfsense firewalls, by using IPSEC protocols.
I succeeded, with both firewalls in the same network. But I'm wondering if it's possible to do the same thing, with 2 Pfsense firewalls...
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by: bsmnconsultancy |
last post by:
In today's digital era, a well-designed website is crucial for businesses looking to succeed. Whether you're a small business owner or a large corporation in Toronto, having a strong online presence can significantly impact your brand's success. BSMN Consultancy, a leader in Website Development in Toronto offers valuable insights into creating effective websites that not only look great but also perform exceptionally well. In this comprehensive...
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