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• Get a random subset from a set in F#

  - by Cay

  I am trying to think of an elegant way of getting a random subset from a set in F# Any thoughts on this? Perhaps this would work: say we have a set of 2x elements and we need to pick a subset of y elements. Then if we could generate an x sized bit random number that contains exactly y 2n powers we effectively have a random mask with y holes in it. We could keep generating new random numbers until we get the first one satisfying this constraint but is there a better way?

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• php max() and min() on associative array

  - by stef

  print_r($pages); print max($pages); print min($pages); shows me Array ( [0] => 1 [1] => 2 [2] => 3 ) 1 2 While I was expecting the last two numbers to be 3 and 1. How come?

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• Best FTP wrapper for iPhone

  - by jamone

  I know you use the C based networking API to do FTP communication but I'd prefer to use something a little higher level. I've seen a few Objective-C based wrappers but I'm not sure what to use. I don't need that complex of FTP interaction. Its just the typical create/delete dirs, upload/download files... What do you recommend?

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• Why does this MySQL Query hang?

  - by zzapper

  SELECT * FROM tbl_order_head AS o INNER JOIN tbl_orders_log AS c ON o.PAYMENT_TRANSACTION_LOG_ID=c.TRANSACTION_ID WHERE o.VISUAL_ID = '77783'; tbl_order_head 67,000 (30 fields) records, tbl_orders_log 17000 (5 fields) records. I don't know if it would eventually return as I am running it on a live server and fear overloading. I am doing similar queries and much more complex queries successfully.

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• How does a cryptographically secure random number generator work?

  - by Byron Whitlock

  I understand how standard random number generators work. But when working with crytpography, the random numbers really have to be random. I know there are instruments that read cosmic white noise to help generate secure hashes, but your standard PC doesn't have this. How does a cryptographically secure random number generator get its values with no repeatable patterns?

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• How do I add NSDecimalNumbers?

  - by Terry B

  OK this may be the dumb question of the day, but supposing I have a class with : NSDecimalNumber *numOne = [NSDecimalNumber numberWithFloat:1.0]; NSDecimalNumber *numTwo = [NSDecimalNumber numberWithFloat:2.0]; NSDecimalNumber *numThree = [NSDecimalNumber numberWithFloat:3.0]; Why can't I have a function that adds those numbers: - (NSDecimalNumber *)addThem { return (self.numOne + self.numTwo + self.numThree); } I apologize in advance for being an idiot, and thanks!

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• How do I execute SQL_CALC_FOUND_ROWS in python MySQLDB

  - by alex

  cursor.execute("SELECT SQL_CALC_FOUND_ROWS user_id FROM...limit 5") rows = cursor.fetchall() ... total_rows = cursor.execute("SELECT FOUND_ROWS()") #this doesn't work for some reason. Edit: I tried SELECT FOUND_ROWS() FROM my_table...and the numbers are funky.

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• Graphviz for documentation.

  - by Marcin

  I noticed that doxygen uses the graphviz library for creating diagrams. Have you ever used graphviz for generating documentation? Is it worth learning the graphviz for documentation purposes outside the scope of doxygen? Or am I better off to sticking with a standard data modeling package like Visio? I understand the merits of it as a graphing library, but for trying to represent more complex UML (or similar) is it still worth looking into?

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• Django: FloatField or DecimalFied for Currency ?

  - by Hellnar

  I am curious which one would be better fitting as a currency field ? I will do simple operations such as taking difference, the percentage between old and new prices. I plan to keep two digits after the zero (ie 10.50) and majority of the time if these digits are zero, I will be hiding these numbers and display it as "10"

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• Android phone contact 2.1

  - by Sudeep SR

  Hi in my application i need to show all the phone contact including contact image, currently i read all the data in to array and show ,but in some lower end phones it create problem ,like out of memory is there any alternative way to display the all the phone contact NB: the default phone contact intent is not my requirment , i need to get all the phone numbers, and also if first name is empty i need to show the organization name

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• how to design the query for non-sql database

  - by Benny

  can anyone give some reference for non-sql database query interface design pattern? For sql-based database, the query can be achieved by combining the query token. but for non-sql, how to design the query, given that the query could be very complex.

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• Rows and Column of Excel File

  - by Mark

  It is possible to write a code that specifying the rows and column of spread sheet in terms of NUMBERS and NOT LIKE (B2:D6) Example: excelSheet.Range("B2:D6").Interior.Color = RGB(100, 100, 255) instead of B2 and D6 I want to write 5 rows and 3 column.. It is posible to write in vb.net 2003 code?

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• How do I create a ListBox In Ext-GWT ?

  - by Salvin Francis

  Plain and Simple, I want to use a Listbox in my project, The demo here: http://www.extjs.com/examples shows no answer, In fact, I really hate it when companies show-off their 'complex' widgets in this manner and fail to show the most basic of all widgets. For example, I discovered class SimpleComboBox over the net till then I assumed that we required a class to contain list store, etc...

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• Ruby Rails _without_ ActiveRecord

  - by devlearn

  Hello, I'm looking for any pointers on how to write a rails web app without ActiveRecord. A doc or an example of a (not too complex) web app using storage backends other than a relational database would be greatly appreciated. It's not clear on what should be implemented in the model classes in order to make the rails app work without the ActiveRecord layer. Thanks,

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• How to hide prev/next controls in "Galleriffic" plugin for jQuery?

  - by Kalinin

  In our project we use plugin for jQuery - Galleriffic (http://www.twospy.com/galleriffic/), it allows you to do slideshow with photo set. How to hide buttons prev/next in "pagination" block? In the navigation ("pagination" block) should be only the page numbers without buttons prev/next.

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• How can i interpret a time value in ascii into a numerical value?

  - by Bilal

  I have a file which is as follows: 15:03:21 II 0.88 0.64 15:03:31 II 0.88 0.64 15:03:42 II 0.40 0.40 etc. after loading the file in matlab, I want to be able to read the first column (which corresponds to time) and interpret them as numerical values. At the moment, they are interpreted as a string of ascii characters and i can't perform any mathematical operations on them. Does anyone have any suggestions as to how i can read the time as numbers instead of a string of ascii characters?

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• Generating db schema from c# class

  - by Niran

  Hi, Is there any other method than nHibernate by wich we can generate db schema from class definition? My classes arn't that complex etc (few one-to-many relations). However I would like to just be able to save my objects in db and recreate schema if needed. I am stuck with .NET 2.0. I am not that particular about performance for this project, I am just lazy to create tables and write save/load code and deel with nHibernate xml. Thanks

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• Connecting slots and events in PyQt4 in a loop

  - by LukaD

  Im trying to build a calculator with PyQt4 and connecting the 'clicked()' signals from the buttons doesn't as expected. Im creating my buttons for the numbers inside a for loop where i try to connect them afterwards. def __init__(self): for i in range(0,10): self._numberButtons += [QPushButton(str(i), self)] self.connect(self._numberButtons[i], SIGNAL('clicked()'), lambda : self._number(i)) def _number(self, x): print(x) When I click on the buttons all of them print out '9'. Why is that so and how can i fix this?

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• effective functional sort

  - by sreservoir

  I'm programming a function for a TI-NSpire, so I can't use the builtins from inside a function. What is the most generally efficient algorithm for sorting a list of numbers without modifying the list itself? (recursion and list-splitting are fair game, as is general use of math.)

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• is there a comprehensive example or tutorial for ibatis 3 with annotations?

  - by nn2010

  I am specifically interested in moving away from XML-based mapper configuration to using pure Java annotations where the SQL statements often take or return complex data structures. Also, it wasn't clear in the samples I saw, how the configuration file was adapted when moving away from XML-based mappers to annotation-based Mapper interfaces.

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• Very Stupid Question: But how to download source from GitHub?

  - by mystify

  I see something strange like: http://github.com/zoul/Finch.git Now I'm not that CVS / SVN / etc. dude. When I open that in the browser it tells me that I did something wrong. So I bet I need some hacker-style tool? Some client? (i mean... why not just provide a zip? isn't the world complex enough?)

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• simple question regarding sorting

  - by mousey

  Given a array of random integers, sort the odd elements in descending order and even numbers in ascending order. e.g. for input (1,4,5,2,3,6,7) Output = (7,5,3,1,2,4,6) Optimize for time complexity.

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• Can I stop Uri from unencoding a url in WebRequest.Create?

  - by Paul

  The code itself isn't complex, it's just not working properly: Uri uri = new Uri("https://www.google.com/webmasters/tools/feeds/sites/http%3A%2F%2Fwww.mydomain.co.uk%2F"); WebRequest.Create(uri); I get a "Bad Request" back from the server, and after much MUCH digging, discovered that the uri is being turned in to "https://www.google.com/webmasters/tools/feeds/sites/http%3A//www.mydomain.co.uk/" which is not what I asked for, and so it's having a whinge Is there a way to stop this?

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• Determine stale data

  - by Andrei

  Say I have a file of this format 12:04:21 .3 12:10:21 1.3 12:13:21 1.4 12:14:21 1.3 ..and so on I want to find repeated numbers in the second column for, say, 10 consequent timestamps, thereby finding staleness. and I want to output the beginning and and end of the stale timestamp range Can someone help me come up with it? You can use awk, bash Thanks

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• Slide in/out event in N97 using J2me

  - by rajiv

  I would like to listen the slide IN/OUT event of the NOKIA devices(Touch + QWERTY Keyboard) in J2ME App. I need your inputs for the same. Do i need to follow complex implementation or is there any other way around?Will midpjni help?

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