Algorithms

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[Message Deleted] kabirbdboy9-Sep-09 15:25 kabirbdboy 9-Sep-09 15:25  [Message Deleted] Re: help me to select my project Tim Craig9-Sep-09 17:56 Tim Craig 9-Sep-09 17:56  kabirbdboy wrote: actually my supervisor said me first find three webside on face recognition. If you can't find three websites with information on face recognition, you need to change majors. Good advice, take it. You measure democracy by the freedom it gives its dissidents, not the freedom it gives its assimilated conformists. Re: help me to select my project kabirbdboy10-Sep-09 1:38 kabirbdboy 10-Sep-09 1:38  thanks for your advise! Re: help me to select my project Richard MacCutchan9-Sep-09 21:37 Richard MacCutchan 9-Sep-09 21:37  Try Google, that's why it exists. Re: help me to select my project Nagy Vilmos10-Sep-09 9:41 Nagy Vilmos 10-Sep-09 9:41  Hi kabirbdboy! I work very hard to earn my money and have next to no free time. Please can I do your homework for you? It is so obvious that typing www.google.com and the search term face recognition is beyond your ability. I would hate for you to fail a course in a subject that you have no aptitude for. How else will the world be able to create all the team leaders, project managers and human resources professionals that we so desperatly need and you are so destined to become? Panic, Chaos, Destruction. My work here is done. Re: help me to select my project kabirbdboy10-Sep-09 15:08 kabirbdboy 10-Sep-09 15:08  thank u.i have find some popular site and some demo project and paper on face recognition.i have already done my 40% work!! Re: help me to select my project Tim Craig10-Sep-09 19:30 Tim Craig 10-Sep-09 19:30  Keep up the good work then. If you ask a question here again that looks like all you want us to do is do your homework for you, you can expect the same kind of responses. If you have a specific question about how some detail works and you show you've actually done some work on the problem, then you may get an answer. You measure democracy by the freedom it gives its dissidents, not the freedom it gives its assimilated conformists. Gradient map Sauce!8-Sep-09 6:21 Sauce! 8-Sep-09 6:21  I have an image with each pixel representing a value in the range 0...1 and would like to map a gradient to the range. Values in the range 0...0.5 should be shaded from black to red, and values in the range 0.5...1 should be shaded red to white. Each colour is represented as a single unsigned int in the form AA RR GG BB with AA being redundant in this case. How would I go about doing that? I'm using C++ but at the moment psuedo code would be just fine. Re: Gradient map Eddy Vluggen8-Sep-09 11:13 Eddy Vluggen 8-Sep-09 11:13  You'd use the Color.FromArgb[^] method, iterating over the different colors Re: Gradient map Alan Balkany9-Sep-09 5:12 Alan Balkany 9-Sep-09 5:12  For each pixel: 1. If the value, v, is 0 to 0.5, R = v * 510, G = B = 0. 2. If v is .5 to 1, R = 255, G = B = (v - .5) * 510. So, at v = 0, the pixel is black. As we go from 0 to .5, red increases to its maximum (255) as we approach .5. From total red at v = .5, it's blended with increasing shades of white, up to total white at v = 1. comipler construction rizwana rashid7-Sep-09 8:23 rizwana rashid 7-Sep-09 8:23  what is the regular expression of muliple line commment other then /* (a+n)* */ bcoz this expression donot accept /* hhhhhhhh*hhhhh*/ string ??????? Re: comipler construction Christian Graus7-Sep-09 15:55 Christian Graus 7-Sep-09 15:55  You need to search for anything except a closing comment, including newlines. Expresso is a great tool for testing and building regex. Christian Graus Driven to the arms of OSX by Vista. Read my blog to find out how I've worked around bugs in Microsoft tools and frameworks. Re: comipler construction mabo428-Sep-09 1:36 mabo42 8-Sep-09 1:36  You should have a look at this step by step article for developing a multiline comment regex: http://ostermiller.org/findcomment.html[^] Re: comipler construction Luc Pattyn8-Sep-09 2:32 Luc Pattyn 8-Sep-09 2:32  it is also conceivable to create a compiler without using any regex. Luc Pattyn Have a look at my entry for the lean-and-mean competition; please provide comments, feedback, discussion, and don’t forget to vote for it! Thank you. Re: comipler construction molesworth10-Sep-09 7:27 molesworth 10-Sep-09 7:27  Just what I was going to say. Regexes are probably the least useful tool for writing a compiler. OK, a spanner is probably less useful, but you know what I mean There are three kinds of people in the world - those who can count and those who can't... Re: comipler construction PIEBALDconsult24-Sep-09 17:44 PIEBALDconsult 24-Sep-09 17:44  You need to remember to escape the asterisks. /\*.*?\*/ It doesn't handle nested comments, but I understand that balancing groups could be used to cover that. One of the problems with trying to do it with a RegEx is that you have to read the entire file into a string before you process it and then use the SingleLine option. Re: Help need,Spanning Tree Moreno Airoldi8-Sep-09 9:18 Moreno Airoldi 8-Sep-09 9:18  I'm not a specialist about spanning trees, but if I remember correctly Prim's algorithm can be used only to find the minimum spanning tree. Finding the maximum spanning tree should be an NP-hard problem and as such can be solved by using a greedy algorithm. Check these links, I didn't read them thoroughly but they should give you some hints on the algorithm you need: http://www.personal.kent.edu/~rmuhamma/Algorithms/MyAlgorithms/Greedy/mst.htm[^] http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TYW-4472K36-P&_user=10&_rdoc=1&_fmt=&_orig=search&_sort=d&_docanchor=&view=c&_searchStrId=1004846747&_rerunOrigin=google&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=94c6c39b092858ddf62a008f9609ee36[^] Good luck. 2+2=5 for very large amounts of 2 (always loved that one hehe!) help needed for loops aihcezs1444-Sep-09 0:11 aihcezs144 4-Sep-09 0:11  The question goes as follow. 1. Write a c++ program that finds and prints all the prime numbers less than 100. (Hint:For each number from 2 to 100, find reaminder = number%n, where n ranges from 2 to sqrt(number). If any remainder equals 0, the number is not a prime number.) 2. Write a c++ program that calculates the nth number in the Fibonacci sequence, where the user enters n into the program interactively. For example, if n=6, the program should display a value of 5.The Fibonacci sequence is 0, 1, 1, 2, 3, 5, 8, 13...; the first two terms are 0 and 1, and each term thereafter is the sum of the two preceding terms-that is, fib(n)=fib(n-1)+fib(n-2). I have tried to run but my program would not work. would anyone please help me out with this. thank you. Re: help needed for loops Richard MacCutchan4-Sep-09 0:18 Richard MacCutchan 4-Sep-09 0:18  What exactly would not work? Re: help needed for loops aihcezs1444-Sep-09 0:37 aihcezs144 4-Sep-09 0:37  after compiling the prime number question, the output of my program shows some weird numbers like 20887633892 20887633892 20887633892 Re: help needed for loops Richard MacCutchan4-Sep-09 0:50 Richard MacCutchan 4-Sep-09 0:50  I'm sorry but my powers of divination are not working today. Can you give us a clue as to the code involved in producing these values? Please try and narrow the problem down to the actual statements that cause the problem, and the input values to whatever algorithm you are using. Re: help needed for loops aihcezs1444-Sep-09 1:00 aihcezs144 4-Sep-09 1:00  #include <iostream> #include <cmath> #include <conio.h> using namespace std; int main() { int num, n, remainder, prime, nonprime; remainder = num % n; for(num=2; num<=100; num++) { for(n=2; n<=sqrt(num); n++) { if(remainder==0) break; else num=prime; } cout<<prime<<" "<<endl; } getche(); return 0; } Re: help needed for loops Luc Pattyn4-Sep-09 1:09 Luc Pattyn 4-Sep-09 1:09  aihcezs144 wrote: remainder = num % n; aihcezs144 wrote: num=prime; I suggest you use the single-stepping capabilities of the debugger and either "watch" some variables or add some statements to print intermediate values, as there are major problems with your code. Is this your first attempt to programming? FYI: statement order is important, and assignment statements work one way (right to left), not both ways (as in mathematical equations). Luc Pattyn Have a look at my entry for the lean-and-mean competition; please provide comments, feedback, discussion, and don’t forget to vote for it! Thank you. Re: help needed for loops [modified] aihcezs1444-Sep-09 2:13 aihcezs144 4-Sep-09 2:13  okay, i've tried a new one but there are sompilation errors of which i could not locate. would you please take a look and tell mw where did i go wrong. thank you #include <iostream> #include<cmath> #include <conio.h> using namespace std; int main() { int num, n, remainder; remainder=num % n; for( num = 2; num <=100 ; num++ ) { for (n=2; n<=sqrt(n); n++) { if( remainder != 0 ) break; } if(remainder) { cout <<num<< " "; } num++; } getche(); return 0; } modified on Friday, September 4, 2009 8:20 AM Re: help needed for loops Luc Pattyn4-Sep-09 2:45 Luc Pattyn 4-Sep-09 2:45  Seems you have removed one problem. Compile-time and often run-time errors contain file name and line number information, use it to your advantage; and tell your IDE to always show line numbers in edit windows (for Visual Studio look here[^]). I'm not going to provide any more help, the goal of exercises like these is for you to learn how to research, analyze, and debug; and not for others to do your work. Luc Pattyn Have a look at my entry for the lean-and-mean competition; please provide comments, feedback, discussion, and don’t forget to vote for it! Thank you.

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