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• Machine learning - training step

  - by palau1

  When you're using Haar-like features for your training data for an Adaboost algorithm, how do you build your data sets? Do you literally have to find thousands of positive and negative samples? There must be a more efficient way of doing this... I'm trying to analyze images in matlab (not faces) and am relatively new to image processing.

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• Programmer tendency to preach [closed]

  - by Daniel

  I've run across several SO posts that come across as preachy or condescending. Do pedagogical programmers feel plagued by thoughtless questions? Or, do programmers count self-sufficiency such a virtue that any perceived lack of ambition merits scolding? These are some theories, admittedly negative ones. Can anyone offer some insight?

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• how do i ininitialize a float to it's max/min value?

  - by Faken

  How do i hard code an absolute maximum or minimum value for a float or double? I want to search out the max/min of an array by simply iterating through and catching the largest. There are also positive and negative infinity for floats, should i use those instead? if so, how do i denote that in my code?

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• What is call out table in unix?

  - by Supereme

  Hi, Can anybody tell me the 'call out table' in unix? The explanation is given in 'Maurice J. Bach' book but I'm getting difficulty in understanding the example especially, the one explaining the reason of negative time out fields. For what purpose the software interrupts are used there? Thanks!

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• haskell recursive function

  - by snorlaks

  Hello, Please help me with writing function which takes two arguments : list of ints and index (int) and returns list of integers with negative of value on specified index position in the table MyReverse :: [Int]-Int-[Int] for example myReverse [1,2,3,4,5] 3 = [1,2,-3,4,5] if index is bigger then length of the list or smaller then 0 return the same list. Thanks for help

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• Help on understanding JS

  - by Anonymous

  I have thos piece of code: Math&&Math.random?Math.floor(Math.random()*10000000000000):Date.getTime(); And as far as i know && is logic operator for AND, so im trying to convert this into PHP and this is where i got: intval(floor(time()/10800000)%10+(rand()?floor(rand()*10000000000000):time())) The problem is that i can't understand the first part Math&& Can anyone help with this one cause i always get negative result, when i should get positive (probably the logic rand-time is not working in my php example)

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• Greatest of Two Numbers Without Using A Relational Operator

  - by ratty

  I want to find the greater of two numbers without using < > this relational operator. I tried this int a,b; if(a/b==0) { b is greater } else { a is greater } but this not working for negative numbers.

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• How to prefix a positive number with plus sign in PHP

  - by user318466

  I need to design a function to return negative numbers unchanged but should add a + sign at the start of the number if its already no present. Example: Input Output ---------------- +1 +1 1 +1 -1 -1 It will get only numeric input. function formatNum($num) { # something here..perhaps a regex? } This function is going to be called several times in echo/print so the quicker the better.

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• How to properly use the .animate() function -- top

  - by sadmicrowave

  Is this the proper way to use the .animate(top) function? Positive number (animate down)-- $("div#container div#history-menu").animate({top:'180px'}, 600); Negative number (animate up)-- $("div#container div#history-menu").animate({top:'-180px'}, 600); Because I'm getting a java error in my error console that says: "error in parsing value for property 'top'. Declaration Dropped."

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• how do I initialize a float to its max/min value?

  - by Faken

  How do I hard code an absolute maximum or minimum value for a float or double? I want to search out the max/min of an array by simply iterating through and catching the largest. There are also positive and negative infinity for floats, should I use those instead? If so, how do I denote that in my code?

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• RFC2616 : Do I really need to set WWW_Authenticate when returning 401?

  - by Chris McCauley

  According to RFC2616 if I return 401 in response to a request to my (Ruby) server, I "MUST include a WWW-Authenticate header field." Is this really true? Not setting the header seems to have no negative impact. I'm using Merb as a web framework and it doesn't force me to set the header. Am I missing something or is this a rule more honoured in the breach?

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• Python - counting sign changes

  - by dadashek

  I have a list of numbers I am reading left to right. Anytime I encounter a sign change when reading the sequence I want to count it. X = [-3,2,7,-4,1,-1,1,6,-1,0,-2,1] X = [-, +, +, -, +, -, +, +, -, -,-,+] So, in this list there are 8 sign changes. When Item [0] (in this case -3) is negative it is considered a sign change. Also, any 0 in the list is considered [-]. Any help would be greatly appreciated.

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• Why is FLT_MIN equal to zero?

  - by Nick Forge

  limits.h specifies limits for non-floating point math types, e.g. INT_MIN and INT_MAX. These values are the most negative and most positive values that you can represent using an int. In float.h, there are definitions for FLT_MIN and FLT_MAX. FLT_MAX is equal to a really large number, as you would expect, but why does FLT_MIN equal zero?

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• I think my boss is considering me that i am unfit.

  - by Nasif

  Hi, I think my boss has some negative mark on me, that i am not fir for coding. But my Tech Lead is very happy about my coding and performance. What i do for improving my career in software development area.

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• add color style to value based on condition

  - by rod

  Hi All, How do I conditionally add the style 'color:red' to the .CurrentDifference if the value happens to be a negative value? Thanks, rod. <div class="sRow"> <div class="sLabel p40"> Difference: </div> <%= (!String.IsNullOrEmpty(Model.Amount)?Model.Amount.CurrentDifference.ToString("c"):string.Empty) %> </div>

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• About the sharepoint LogToHistoryListActivity.Duration.

  - by fang

  Does anybody know what the LogToHistoryListActivity.Duration does? I see some people set it to zero and some people keep the default negative value. I didn't find any useful information on MSDN. Thanks,

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• How can I perform a reverse string search in Excel without using VBA?

  - by e.James

  I have an Excel spreadsheet containing a list of strings. Each string is made up of several words, but the number of words in each string is different. Using built in Excel functions (no VBA), is there a way to isolate the last word in each string? Examples: Are you classified as human? - human? Negative, I am a meat popsicle - popsicle Aziz! Light! - Light!

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• BFS algorithm problem

  - by Gorkamorka

  The problem is as follows: A wanderer begins on the grid coordinates (x,y) and wants to reach the coordinates (0,0). From every gridpoint, the wanderer can go 8 steps north OR 3 steps south OR 5 steps east OR 6 steps west (8N/3S/5E/6W). How can I find the shortest route from (X,Y) to (0,0) using breadth-first search? Clarifications: Unlimited grid Negative coordinates are allowed A queue (linked list or array) must be used No obstacles present

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• biggest of two nos without using relational operator

  - by ratty

  i like to find the greatest of two nos without using < this relational operator. i tired this int a,b; if(a/b==0) { b is greater } else { a is greater } but this not working for negative nos .please help for this

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• Mathematical modulus in c#

  - by penguat

  Is there a library function in c# for the mathematical modulus of a number - by this I specifically mean that a negative integer modulo a positive integer should yield a positive result.

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• wrapper not containing content div

  - by madelikethis

  Hi, I'm trying to get my wrapper to hold my content but it won't. I've taken out the floats and added "overflow: visible" no no avail. I'm thinking it's because of my z-indexing and negative margins, but have tried taking these out and still no change. Any ideas? http://www.jenniferhope.com/bio (the float is still in this example.) Thanks for any help you can offer!

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• how to invisible a column in gridview

  - by Joby Kurian

  how to invisible a column in gridview.I tried to use this---dataGridView.Columns(0).Visible = False.But its getting an error "Index was out of range. Must be non-negative and less than the size of the collection. Parameter name: index".How to do that?

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• Performance bottleneck in concurrent calls to System.currentTimeInMillis()

  - by user303423

  I suspect that calls from separate threads (15) are having a negative effect on performance. Is there a better way to get at the system time in concurrent applications?

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• Fastest possible summing numbers up to N

  - by dada

  Okay so i need really FAST algorithm or code in C if you have any it would be nice. The task is to sum all numbers from 1 to N for a given number N (it can be negative number too), so i did the usual way (you know just summing with loop from 1 to N) but it's not fast enough - i need something faster, i guess that i need the fastest possible way to do this. If anyone could help me, please do. Thanks.

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• Code Coverage Analysis for Embedded C++ projects

  - by Steve Hawkins

  I have recently started working on a very large C++ project that, after completing 90% of the implementation, has determined that they need to demonstrate 100% branch coverage during testing. The project is hosted on an embedded platform (Green Hills Integrity). I'm looking for suggestions and experiences from others on StackOverflow that have used code coverage products in similar environments. I'm interested in both positive and negative comments regarding these types of tools.

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