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• Is there a built in API for handling pinch-zoom functionality in Android

  - by krise

  Hi there, I just wanted to know if there is some kind of class to use the multitouch features of android 2.1. Specifically I am trying to implement pinch-zoom and was wondering if I always have to measure the distance between two touch events and calculate the zoom level on my own? Thanks, chris

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• Remove last character from a variable and then multiply against another variable

  - by Thomas

  I have a whole bunch of percentages stored as XX% (e.g. 12%, 50%, etc..) I need to remove the percentage sign and then multiply the percent against another variable thats just a number (e.g. 1000, 12000) and then output the result. Is there a simple way to strip the percentage sign and then calculate the output with PHP? Or should I consider some sort of JS solution?

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• Scroll a ListBox's VirtualizingStackPanel with buttons

  - by Cen

  I have a Listbox displaying 5 items at a time, horizontally. I want to implement a 'Previous' and 'Next' button that when clicked, will display the previous set of 5, or next set of 5 items. I am not displaying the horizontal scroll bar, as I don't want a user to navigate with that. Is there already some functionality implemented so I can do this, or do I need to write code to calculate what items I'm displaying, etc, in the button's click events? Thanks in advance!

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• What is a good way of Enhancing contrast of color images?

  - by erjik

  I split color image for 3 channels and made a contrast enhancement of each channel. Then merged them together, I like the image at the result, but it has different colors. Black objects became yellow and so on... EDIT: The algorithm I used is to calculate the 5th percentile and the 95th percentile as min and max values, and then expand the values of image so that it will have min and max values as 0 and 255. If there is a better approach please tell me.

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• Find the point specified by 3 latitude and longitude points, and 3 distances

  - by nohat

  There exists an unknown target location (latitude and longitude co-ordinates). I have 3 latitude and longitude co-ordinate pairs and for each pair a distance in miles to the target location. How can I calculate the co-ordinates of the target location?

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• Implementing a hilbert map of the internet

  - by Martin

  In the XKCD comic 195 a design for a map of the internet address space is suggested using a hilbert curve so that items from a similar IPs will be clustered together. Given an IP address, how would I calculate the 2D coordinates (in the range zero to one) that this IP is located on such a map?

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• How can I get node coordinates from a graph, using Perl?

  - by jonny

  Ok, I have a flowchart definition (basically, array of nodes and edges for each node). Now I want to calculate coordinates for every task in the flow, preferably hierarchycal style. I need something like Graph::Easy::Layout but I have no idea how to get nodes coordinates: I render nodes myself and I only want to retrieve box coordinates/size. Any suggestions? What I need is a CPAN module available even in Debian repository.

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• Height of the div respective to other DIV

  - by Wazdesign

  Hi I have DIV structure something like this. <div class="leftCol"> Left Col Content </div> <div class="rightCol"> Right Col Content </div> I want to calculate the height of the right col. and that height to Left col.

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• CRC function without order dependency

  - by Pirks

  I need a CRC mechanism to calculate the CRC of a number of strings, such that, given two strings, A and B, the sum crc(A) + crc(B) == crc(A+B). P.S. XOR is too weak---the algorithm should be not trivial for reverse engineering.

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• issue displaying total row on devexpress pivot grid when paging

  - by Leonardo Raygoza

  Hi, I'm working with devexpress pivot grid, so I added the paging function and everything is working fine, the only thing I need to do is display the total row on each page, at this moment it is displayed just in the last one, I was looking on DevExpress documentation and it looks like pivot grid calculate the total and gran total automatically and I don't find any thing about my task, anybody knows how can I do this??? Regards Leo

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• Convolving two signals

  - by John Elway

  Calculate the convolution of the following signals (your answer will be in the form of an equation): h[n] = delta[n-1] + delta[n+1], x[n] = delta[n-a] + delta[n+b] I'm lost as to what I do with h and x. Do I simply multiply them? h[n]*x[n]? I programmed convolution with several types of blurs and edge detectors, but I don't see how to translate that knowledge to this problem. please help!

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• What are pros and cons to use 'em' sizing unit for width, height, padding, margin, line-height in fi

  - by metal-gear-solid

  in my projects i use em for sizing of font only with body {62.5%}? with this method i can easily calculate em value. so what are pros and cons if i use em sizing unit for width, height, padding, margin, line-height also along with font for fixed width layouts?

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• Get total size of all Shared Folders (Except Admin Shares) from a list of Servers?

  - by bEUY

  Hi there, I'm looking to calculate the total size of all shared folders (except admin shares) on a number of different servers (consolidating all accessed files to a NAS box for easier backup / restore) but am having a bit of trouble finding a solution. I'm certain this could be done in powershell but I just can't find the right information to get me going, I can currently spit out a list of all shares on the servers but am not sure where to go from here: $servers =@( "server1", "server2") foreach($server in $servers) { get-WmiObject Win32_Share -computerName $server -filter "Type = 0" }

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• How do I send information to an HLSL effect in DirectX 10?

  - by pypmannetjies

  I'd like to send my view vector to an ID3D10Effect variable in order to calculate specular lighting. How do I send a vector or even just scalar values to the HLSL from the running DirectX program? I want to do something like render() { //do transformations D3DXMatrix view = camera->getViewMatrix(); basicEffect.setVariable(viewVector, view); //render stuff }

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• Core Data Change property value when another property changes

  - by user320587

  Hi, I have a Core Data Entity which has three properties startDate, endDate and duration. All three properties are persistent properties. I would like to know how I can calculate and update the duration property whenever the value for startDate and endDate changes? BTW, I won't be able to make the duration as transient property since I have to use the property for sorting in my table view? Any help is greatly appreciated Thanks, Javid

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• Formula for PERT - Pessimistic time and optimistic time

  - by karthi

  I found PERT examples include a formula (a + 4m + b)/6 where a= optimistic time , b= pessimistic time and m= actual time to complete the task but how to calculate a and b? please help me as soon as possible

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• Multiple conditions on select query

  - by stats101

  I have a select statement and I wish to calculate the cubic volume based on other values within the table. However I want to check that neither pr.Length_mm or pr.Width_mm or pr.Height_mm are NULL prior. I've looked at CASE statements, however it only seems to evaluate one column at a time. SELECT sa.OrderName, sa.OrderType, pr.Volume_UOM ,pr.Length_mm*pr.Width_mm*pr.Height_mm AS Volume_Cubic ,pr.Length_mm*pr.Width_mm AS Volume_Floor ,pr.Length_mm ,pr.Height_mm ,pr.Width_mm FROM CostToServe_MCB.staging.Sale sa LEFT JOIN staging.Product pr ON sa.ID = pr.ID

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• Calculating correlation coefficient using PostgreSQL?

  - by Dave

  I have worked out how to calculate the correlation coefficient between two fields if both are in the same table: SELECT corr(column1, column2) FROM table WHERE <my filters>; ...but I can't work out how to do it when the columns are from different tables (I need to apply the same filters to both tables). Any hints, please?

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• Check a Date is between two dates in Java

  - by dimitar

  Hello guys, One thing I want to know is how to calculate what date will it be 10 days from today. Second thing is to check if one Date is between two other Dates. For example, let's say I have an app that shows what events I need to do in the next 10 days (planner). Now how can I see if the date I assigned to an event is between today and the date that is 10 days from today?

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• play mp3 file using jquery

  - by angelina

  Dear all, How can i play an mp3 file using jquery in website.I m using servlets or http to play a song.Also how can i calculate total time of song played. Regards Angelina

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• Draw 2 parallel lines

  - by Ben Martin

  How can I calculate the points to draw 2 parallel lines. I know the start and end points for the centre of the parallel lines. To makes thing a little bit harder, it needs to support straight and Bezier curved lines.

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• get an age from a D.O.B field

  - by aadersh patel

  I need to calculate the age of a "customer" from their date of birth. have tried to use: DATEDIFF(year,customer.dob,"2010-01-01"); but it doesnt seem to like it. Any ideas, I KNOW its going to be something simple!? Thanks

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• How to do motion tracking of a object using video

  - by Niroshan

  Could someone direct me to a tutorial or guide me how to track motion of a object moving with 6 DOF. I am planing to use a video stream of a moving toy car. I want to calculate displacement and rotation angle of the toy car. I came across some research papers but couldn't find any libraries to the job. Is there a way to do this using OpenCV or Matlab or some other freely available software? Thank you

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• Is there a way to get access to the row height previously calculated in "heightForRowAtIndexPath" ?

  - by gotye

  Hey everyone, I calculate the height of a row in the method "heightForRowAtIndexPath" but I need to use this value in the method "cellForRowAtIndexPath" ... is there a way to get access to the value already calculated or do I need to do the calculations again ? Thks, Gotye.

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• Should I consider memmove() O(n) or O(1) ?

  - by Andrei Ciobanu

  Hello, this may be a silly question, but I want to calculate the complexity of one of my algorithms, and I am not sure what complexity to consider for the memmove() function. Can you please help / explain ? void * memmove ( void * destination, const void * source, size_t num ); So is the complexity O(num) or O(1). I suppose it's O(num), but I am not sure as I lack for now the understanding of what's going on under the hood.

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