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  • Most Astonishing Violation of the Principle of Least Astonishment

    - by Adam Liss
    The Principle of Least Astonishment suggests that a system should operate as a user would expect it to, as much as possible. In other words, it should never "astonish" the user with unexpected behavior. In your experience as the "astonishee," what types of systems are the worst offenders, and if you were the project manager, how would you correct the problem? Bonus if your answer describes how you'd retrain the developers!

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  • Sorting DB tables from least dependent to most dependent

    - by Sergey Mikhanov
    Hi community, I'm performing a data migration and the database I'm using only allows to export and import each table separately. In such a setup importing becomes a problem since the order in which tables are imported is important (you have to import referenced tables before referencing ones). Is there any external tool that allows me to list the database tables sorted from least dependent to most dependent? Thanks in advance.

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  • Simple popup java form with at least two fields

    - by nunos
    This is, I suppose, a very simple question for any Java programmer. My question is as simple as this: When the user clicks a button, I want to show a popup form that should have at least two JTextFields and two JLabels, so using JOptionPane.showInputDialog is not a possibility. Thanks.

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  • Least intrusive antivirus software for development PC?

    - by poppavein
    What is the least intrusive and most effective antivirus software for a Windows PC that is used for software development (lots of small files and lots of disk I/O)? The software should support running from the command line so that virus scan be included into the build process. Edit: I understand that prevention techniques work better than any antivirus, but the employer demands that commercial AV software be used in the development environment (looking a replacement for horrible Symantec Antivirus).

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  • Jquery validator plugin- Validates at least one in the group

    - by christian
    [http://jsfiddle.net/mhmBs/][1] I tried using the method that he uses in a jquery validator plugin.. My error container is separated from the form, it is outside the form. When I use that method to validated that the user input at least one from 3 input text boxes. It validates the field, but the other items to be validated is ignored specially the items before 3 input text boxes.

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  • Least common multiple for 3 or more numbers

    - by paan
    How do you calculate the least common multiple of multiple numbers? So far I've only been able to calculate it between two numbers. But have no idea how to expand it to calculate 3 or more numbers. So far this is how I did it LCM = num1 * num2 / gcd ( num1 , num2 ) With gcd is the function to calculate the greatest common divisor for the numbers. Using euclidean algorithm But I can't figure out how to calculate it for 3 or more numbers.

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  • PHP checking if two dates differs at least tree months

    - by user2301515
    In php how to check if one date (given as string) differs to another date at least tree month (unable to find any examples): $date1 = "2013-11-05"; $date2 = "2013-11-19"; //both dates is in form yyyy.mm.dd differsTreeMonths($date1,$date2) { ???? return $differs; } differsTreeMonths("2013-11-05","2014-05-02");//true differsTreeMonths("2014-01-01","2014-04-01");//true differsTreeMonths("2014-01-01","2014-03-31");//false differsTreeMonths("2013-12-01","2014-01-15");//false etc Thank you

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  • Python Least-Squares Natural Splines

    - by Eldila
    I am trying to find a numerical package which will fit a natural which minimizes weighted least squares. There is a package in scipy which does what I want for unnatural splines. import numpy as np import matplotlib.pyplot as plt from scipy import interpolate import random x = np.arange(0,5,1.0/2) xs = np.arange(0,5,1.0/500) y = np.sin(x+1) for i in range(len(y)): y[i] += .2*random.random() - .1 knots = np.array([1,2,3,4]) tck = interpolate.splrep(x,y,s=1,k=3,t=knots,task=-1) ynew = interpolate.splev(xs,tck,der=0) plt.figure() plt.plot(xs,ynew,x,y,'x')

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  • Position of least significant bit that is set

    - by peterchen
    I am looking for an efficient way to determine the position of the least significant bit that is set in an integer, e.g. for 0x0FF0 it would be 4. A trivial implementation is this: unsigned GetLowestBitPos(unsigned value) { assert(value != 0); // handled separately unsigned pos = 0; while (!(value & 1)) { value >>= 1; ++pos; } return pos; } Any ideas how to squeeze some cycles out of it? (Note: this question is for people that enjoy such things, not for people to tell me xyzoptimization is evil.) [edit] Thanks everyone for the ideas! I've learnt a few other things, too. Cool!

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  • jquery validate check at least one checkbox

    - by Omu
    I have something like this: <form> <input id='roles' name='roles' type='checkbox' value='1' /> <input id='roles' name='roles' type='checkbox' value='2' /> <input id='roles' name='roles' type='checkbox' value='3' /> <input id='roles' name='roles' type='checkbox' value='4' /> <input id='roles' name='roles' type='checkbox' value='5' /> <input type='submit' value='submit' /> <form> I would like to validate that at least one checkbox (roles) should be checked, is it possible with jquery.validate ?

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  • Python: Elegant way to check if at least one regex in list matches a string

    - by houbysoft
    Hi. I have a list of regexes in python, and a string. Is there an elegant way to check if the at least one regex in the list matches the string? By elegant, I mean something better than simply looping through all of the regexes and checking them against the string and stopping if a match is found. Basically, I had this code: list = ['something','another','thing','hello'] string = 'hi' if string in list: pass # do something else: pass # do something else Now I would like to have some regular expressions in the list, rather than just strings, and I am wondering if there is an elegant solution to check for a match to replace if string in list:. Thanks in advance.

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  • JQuery - is at least one checkbox checked

    - by Laramie
    I am in the process of learning JQuery thanks mostly to the positive reference here on Stack Overflow. I need a function that checks all the checkboxes in an element which have the same CSS class. It should returns true if at least one of them is checked. There are also other boxes in the element that are irrelevant to the check. The CSS class is unnecessary and only in place to create a way to identify the checkboxes in the group. It feels like bad practice, so any recommendations about other ways to identify them are welcome.

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  • Regular Expression: Allow letters, numbers, and spaces (with at least one letter or number)

    - by makeee
    I'm currently using this regex ^[A-Z0-9 _]*$ to accept letters, numbers, spaces and underscores. I need to modify it to require at least one number or letter somewhere in the string. Any help would be appreciated! This would be for validating usernames for my website. I'd actually like to support as many characters as I can, but just want to ensure that I prevent code injection and that characters will display fine for all users. So I'm definately open to regex validation suggestions that would support a wider set of characters.

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  • MVC3 custom validation attribute for an "at least one is required" situation

    - by Pricey
    Hi I have found this answer already: MVC3 Validation - Require One From Group Which is fairly specific to the checking of group names and uses reflection. My example is probably a bit simpler and I was just wondering if there was a simpler way to do it. I have the below: public class TimeInMinutesViewModel { private const short MINUTES_OR_SECONDS_MULTIPLIER = 60; //public string Label { get; set; } [Range(0,24, ErrorMessage = "Hours should be from 0 to 24")] public short Hours { get; set; } [Range(0,59, ErrorMessage = "Minutes should be from 0 to 59")] public short Minutes { get; set; } /// <summary> /// /// </summary> /// <returns></returns> public short TimeInMinutes() { // total minutes should not be negative if (Hours <= 0 && Minutes <= 0) { return 0; } // multiplier operater treats the right hand side as an int not a short int // so I am casting the result to a short even though both properties are already short int return (short)((Hours * MINUTES_OR_SECONDS_MULTIPLIER) + (Minutes * MINUTES_OR_SECONDS_MULTIPLIER)); } } I want to add a validation attribute either to the Hours & Minutes properties or the class itself.. and the idea is to just make sure at least 1 of these properties (Hours OR minutes) has a value, server and client side validation using a custom validation attribute. Does anyone have an example of this please? Thanks

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  • Suggest a good method with least lookup time complexity

    - by Amrish
    I have a structure which has 3 identifier fields and one value field. I have a list of these objects. To give an analogy, the identifier fields are like the primary keys to the object. These 3 fields uniquely identify an object. Class { int a1; int a2; int a3; int value; }; I would be having a list of say 1000 object of this datatype. I need to check for specific values of these identity key values by passing values of a1, a2 and a3 to a lookup function which would check if any object with those specific values of a1, a2 and a3 is present and returns that value. What is the most effective way to implement this to achieve a best lookup time? One solution I could think of is to have a 3 dimensional matrix of length say 1000 and populate the value in it. This has a lookup time of O(1). But the disadvantages are. 1. I need to know the length of array. 2. For higher identity fields (say 20), then I will need a 20 dimension matrix which would be an overkill on the memory. For my actual implementation, I have 23 identity fields. Can you suggest a good way to store this data which would give me the best look up time?

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  • sql - HAVING at least 10

    - by every_answer_gets_a_point
    i would like to display results for values that are only 10 and over select name, count(*) from actor join casting on casting.actorid = actor.id where casting.ord = 1 group by name order by 2 desc that will return this: name count(*) Sean Connery 19 Harrison Ford 19 Robert De Niro 18 Sylvester Stallone 18 etc but i want to return values of count(*) that are only above 10 how do i do this? with having?

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  • Sparse constrained linear least-squares solver

    - by Jacob
    This great SO answer points to a good sparse solver, but I've got constraints on x (for Ax = b) such that each element in x is >=0 an <=N. The first thing which comes to mind is an QP solver for large sparse matrices. Also, A is huge (around 2e6x2e6) but very sparse with <=4 elements per row. Any ideas/recommendations? I'm looking for something like MATLAB's lsqlin but with huge sparse matrices.

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  • lowest latency, least overhead app server?

    - by Mark Harrison
    I'm designing an application which will have a network interface for feeding out large numbers of very small metadata requests. The application code itself is very fast, basically looking up data cached in memory and sending it to the client. What's the absolute lowest latency I can get for a network application server running on a linux box? This will be an internal app running on gigE with no authentication. Any language/framework considered, with a preference for C, C++, or Python. Likewise for protocol, although HTTP would be nice.

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  • Looking for fastest and least-programming-required path to implement a web site with user submitted

    - by Howiecamp
    I'm looking to throw up a web site that supports user submitted entries and allows voting and comments. Similar in form and function to FMyLife. Basic requirements of site: Users can submit text entries - generally 1 liners Enters can be up or down voted Comments allowed - presentation collapseable Would like the fastest path possible. Ideal solution is configurable vs requirement for programming.

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