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• PHP Library: Calculate a bounding box for a given lat/lng location

  - by brain

  I'm looking for a PHP Library / PHP Script that allows me to calculate an accurate bounding box for a given center point (lat/lon). Using an ellipsoid formula (f.ex. WGS84) would be great. I know, there have to be a library but I'm not able to find one.

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• Algorithm to calculate the number of divisors of a given number

  - by sker

  What would be the most optimal algorithm (performance-wise) to calculate the number of divisors of a given number? It'll be great if you could provide pseudocode or a link to some example. EDIT: All the answers have been very helpful, thank you. I'm implementing the Sieve of Atkin and then I'm going to use something similar to what Jonathan Leffler indicated. The link posted by Justin Bozonier has further information on what I wanted.

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• how can i calculate the polynomial that has the following asymptotes

  - by joshs

  how can i calculate the polynomial that has the asymptotes (1) y = x where x = 1, and (2) y = 1 where x = 365 I realize this may not be the proper forum but I figured somebody here could answer this in jiffy. Also, I am not looking for an algorithm to answer this. I'd just like like to see the process. Thanks.

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• How to calculate next Friday at 3am?

  - by Mark

  How can you calculate the following Friday at 3am as a datetime object? Clarification: i.e., the calculated date should always be greater than 7 days away, and less than or equal to 14. Going with a slightly modified version of Mark's solution: def next_weekday(dt=datetime.datetime.now(), time_of_day=datetime.time(hour=3), day_of_week=4): dt += datetime.timedelta(days=7) if dt.time() < time_of_day: dt = dt.combine(dt.date(), time_of_day) else: dt = dt.combine(dt.date(), time_of_day) + datetime.timedelta(days=1) return dt + datetime.timedelta((day_of_week - dt.weekday()) % 7)

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• Calculate SOM sensitivity accuracy specificity MATLAB

  - by Tim

  Hello, I just implemented a SOM algorithm in MATLAB that outputs component planes and U matrix....but i want to be able to calculate sensitivity, accuracy and specificity....how do i go about doing this in MATLAB??....any ideas or useful links would be highly appreciated??

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• Calculate occurrences of specified word in a large text file

  - by Tony

  This is an interview question, and should concern about efficiency. How to calculate occurrences of specified word in a large text file? I can only think of indexOf() method in most programming languages, but I don't think that the correct answer.

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• Big O, how do you calculate/approximate it?

  - by Sven

  Most people with a degree in CS will certainly know what Big O stands for. It helps us to measure how (in)efficient an algorithm really is and if you know in what category the problem you are trying to solve lays in you can figure out if it is still possible to squeeze out that little extra performance.* But I'm curious, how do you calculate or approximate the complexity of your algorithms? *: but as they say, don't overdo it, premature optimization is the root of all evil, and optimization without a justified cause should deserve that name as well.

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• How to calculate an IPv6 IP Number?

  - by Bram

  I'm adding GeoIP tracking to WCF Web Service using MaxMinds' GeoIP Lite Country. All works well for their IPv4 database but they don't give any samples to calculate an IPv6 IP Number. I've contacted them and they said to use a search engine. Anyone have a sample they're willing to share? Any language will do.

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• Java how to calculate ervy week first day and last day

  - by newbie123

  I was trying to create a weekly calendar which look like this http://dhtmlx.com/docs/products/dhtmlxScheduler/sample_basic.html Any idea how to calculate every week date. example this week monday - sunday 7 june, 8 june, 9 june, 10 june, 11 june , 12 june, 13 june

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• How to calculate age when date of birth is given in c

  - by bond

  Hi How can i calculate age in c when date of birth is given... like if today date is 20/04/2010 and date of birth is 12/08/86 then age will be 23 years 8 months and 8 days Thanks

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• calculate the average of three encrypted numbers

  - by CKeven

  Is possible to calculate average of three encrypted integer? No constrain on the method of encrypting. The point of this is just to hide the three numbers and find average.

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• What is procedure to calculate physical memory address?

  - by Maxood

  How can we calculate the physical memory address generated by the following segment: offset pairs (both are hexadecimal values). a. 0010:0200 b. 0100:DFAD c. DADD:6727 Please explain in detail

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• Dynamically calculate frequency value.

  - by MS Nathan

  Hi, In my app, I want to find/calculate the audio frequency as dynamically when i am recording an audio and no need to save, play and all. Now i am trying to do that with help of an aurioToch sample code. In that sample, inside FFTBufferManager class methods such as GrabAudioData and ComputeFFT,Here I am not able to find where they are calculating frequency value as dynamically depends on the audio sound and I spent more than 5 days.please help me.

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• how to calculate the 4 days before date of the target date

  - by Ranjana

  i have two dates ValidFrom : 20-04-2010 validTo : 02-05-2010 i need to know 4 days(date) before the validity expire .how to calculate the 4 days before date of the validity expire date 02-05-2010

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• calculate euclidean distance with numpy

  - by Nathan Fellman

  I have two points in 3D: (xa,ya,za) (xb,yb,zb) And I want to calculate the distance: dist = sqrt((xa-xb)^2 + (ya-yb)^2 + (za-zb)^2) What's the best way to do this with Numpy, or with Python in general? I have: a = numpy.array((xa,ya,za)) b = numpy.array((xb,yb,zb))

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• How to calculate year from entering my age using php

  - by Fero

  Hi How can i calculate year from entering my age using php. example: i am entering my age as 24. So that i need to get the year as 1985. how this can be done. thanks in advance

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• Calculate broadcast address given IP address and subnet in PowerShell

  - by halr9000

  My goal is to calculate the broadcast address when given the IP and subnet mask of a host node. I know, sounds like homework. Once I reasoned through my task and boiled it down to this, I was amused with myself. Anyway, the solution will look something like the one in this question I suppose, but I'm not a math major and my C sucks. I could do with a PowerShell (preferred) or C# example to get me going. thanks!

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• How do I calculate percentiles with python/numpy?

  - by Uri

  Is there a convenient way to calculate percentiles for a sequence or single-dimensional numpy array? I am looking for something similar to Excel's percentile function. I looked in NumPy's statistics reference, and couldn't find this. All I could find is the median (50th percentile), but not something more specific.

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• How do you calculate accumulative time in C#?

  - by lima

  I want to calculate the time span between 2 times which I saved in a database. So literally I want to know the length of time between the 2 values. 14:10:20 - 10:05:15 = 02:05:05 So the result would be 02:05:05. How would I be able to achieve this using C#? 14:10:20 is the format I saved it in in my database.

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• Calculate date from numeric value

  - by elias

  The number 71867806 represents the present day, with the smallest unit of days. How can I calculate the currente date from it? (or) convert it into an Unix timestamp? Solution shouldn't use language depending features. Thanks!

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• MySQL: Calculate depth in a parent-child model?

  - by Ivarska

  As title says: How do I calculate a node's depth in a parent-child model? I'll need the depth to, among other things, create the indent in my list (coded with PHP). Thank you in advance.

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• calculate number of repetition of character in string in c#

  - by salamonti

  how can I calculate the number of repetition of character in string in c# ? example I have sasysays number of repetition of character 's' is 4

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• What is the fastest way to calculate the number of bits needed to store a number

  - by Matt Wamboldt

  I'm trying to optimize some bit packing and unpacking routines. In order to do the packing I need to calculate the number of bits needed to store integer values. Here is the current code. if (n == -1) return 32; if (n == 0) return 1; int r = 0; while (n) { ++r; n >>= 1; } return r;

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• How to calculate the following Friday at 3am?

  - by Mark

  How can you calculate the following Friday at 3am as a datetime object? Clarification: i.e., the calculated date should always be greater than 7 days away, and less than or equal to 14.

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• How to calculate gcc compilation time ?

  - by PS.OHM

  Hi Guys I what know gcc compile time. gcc have any command or option for calculate compile time? [example] I have file hello.c and then compile.I what know spent time to compile

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