473,699 Members | 2,215 Online
Bytes | Software Development & Data Engineering Community
+ Post

Home Posts Topics Members FAQ

Finding distance

Set A={y1,y2,y3}
How can i find set B={y2-y1,y3-y2,y3-y1} in a fast way?
Thanks!

-Bob
Jul 23 '05 #1
2 1630
Bob Jenkins wrote:
Set A={y1,y2,y3}
How can i find set B={y2-y1,y3-y2,y3-y1} in a fast way?


Perhaps you could tell us what 'yN' is and what you consider "fast".
By "Set" or "set" do you mean 'std::set' or something else? Is your
question about C++ language or about a general programming technique?
Jul 23 '05 #2
Bob Jenkins wrote:
Set A={y1,y2,y3}
How can i find set B={y2-y1,y3-y2,y3-y1} in a fast way?
Thanks!

-Bob


How fast does it need to be?
How many times will the statement be calculated?
Is the program in a real-time scenario?
Why does it need to be done faster than the usual
distance formula?

--
Thomas Matthews

C++ newsgroup welcome message:
http://www.slack.net/~shiva/welcome.txt
C++ Faq: http://www.parashift.com/c++-faq-lite
C Faq: http://www.eskimo.com/~scs/c-faq/top.html
alt.comp.lang.l earn.c-c++ faq:
http://www.comeaucomputing.com/learn/faq/
Other sites:
http://www.josuttis.com -- C++ STL Library book
http://www.sgi.com/tech/stl -- Standard Template Library
Jul 23 '05 #3

This thread has been closed and replies have been disabled. Please start a new discussion.

Similar topics

20
3888
by: Xenophobe | last post by:
I have successfully converted the ASP code included in the following article to PHP: http://www.4guysfromrolla.com/webtech/040100-1.shtml As described the high and low latitudes and longitudes are pre-calculated and passed to the query. SELECT * FROM Locations
6
4048
by: Christoph Pingel | last post by:
Hi all, an interesting problem for regex nerds. I've got a thesaurus of some hundred words and a moderately large dataset of about 1 million words in some thousand small texts. Words from the thesaurus appear at many places in my texts, but they are often misspelled, just slightly different from the thesaurus. Now I'm looking for the best strategy to match the appearence of my thesaurus items in the texts. Do I have to build patterns...
6
3776
by: Joe | last post by:
I have a: vector<string> which contains a few dozen elements. I want to find the index of the element containing a certain string. for example: vector<string> strings; strings.push_back("abc"); strings.push_back("xyz"); strings.push_back("lmnop");
20
17036
by: Webdad | last post by:
Hi! I running my first year as industrial engineer (informatics) We have an assignment to do : .... create a playfield (matrix). Some places in that field are blocked, so you can't pass them. The others are free to go over ... (I already found that part) -> http://users.pandora.be/hebbrecht/jochen/c++/test.cpp
2
3305
by: B Moor | last post by:
I have a database with 100,000's records, each with a unique reference, eg A123BNK456 I would like to generate a search facility whereby we can choose an exact match or partial match, where the partial match could be any of the following:- Partial match 1: 1 character maybe wrong Partial match 2: 2 characters maybe wrong Partial match 3: 3 characters maybe wrong
9
2318
by: nottheartistinquestion | last post by:
As an intellectual exercise, I've implemented an STL-esque List<and List<>::Iterator. Now, I would like a signed distance between two iterators which corresponds to their relative position in the list. For instance, if I did something like distance(list.end(), list.begin()), I would get -list.size(). The STL's iterator distance function amounts to something like this: distance_type distance(Iterator first, Iterator last) {...
5
2554
by: pepito72 | last post by:
Hi A problem with trying to find the nearest colour. I have an image which I use GetPixel to return the colour of various points. However .... not all colours returned will be a System/Known/Pre- defined colour. So they wont have corresponding names - this is a problem because my app needs to return the colour name of each pixel. So I have looked at GetNearestColor but this just seems to return the original color I passed it in the...
11
6373
by: devnew | last post by:
hello while trying to write a function that processes some numpy arrays and calculate euclidean distance ,i ended up with this code (though i used numpy ,i believe my problem has more to do with python coding style..so am posting it here) .... # i am using these numpy.ndarrays to do the calculation facespace # of shape(totalimgs,imgpixels) weights # of shape(totalimgs,selectedfacespaces)
1
14200
by: Glenton | last post by:
Hi All Here is a very simple little class for finding a shortest route on a network, following Dijkstra's Algorithm: #!/usr/bin/env python #This is meant to solve a maze with Dijkstra's algorithm from numpy import inf from copy import copy
0
9184
Oralloy
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...
0
9048
jinu1996
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...
1
8931
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,...
0
8892
tracyyun
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...
0
7767
agi2029
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...
1
6539
isladogs
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...
0
4635
by: adsilva | last post by:
A Windows Forms form does not have the event Unload, like VB6. What one acts like?
1
3064
by: 6302768590 | last post by:
Hai team i want code for transfer the data from one system to another through IP address by using C# our system has to for every 5mins then we have to update the data what the data is updated we have to send another system
2
2359
muto222
by: muto222 | last post by:
How can i add a mobile payment intergratation into php mysql website.

By using Bytes.com and it's services, you agree to our Privacy Policy and Terms of Use.

To disable or enable advertisements and analytics tracking please visit the manage ads & tracking page.