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  • Creating simple waveforms with CoreAudio

    - by Koning Baard
    I am new to CoreAudio, and I would like to output a simple sine wave and square wave with a given frequency and amplitude through the speakers using CA. I don't want to use sound files as I want to synthesize the sound. What do I need to do this? And can you give me an example or tutorial? Thanks.

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  • sort data in c language

    - by ANIL MANE
    Hello C experts, I need little help on following requirement, as I know very little about C syntaxes. I have data in a file like this 73 54 57 [52] 75 73 65 [23] 65 54 57 [22] 22 59 71 [12] 22 28 54 [2] 65 22 54 73 [12] 65 28 54 73 [52] 22 28 65 73 [42] 65 54 57 73 [22] 22 28 54 73 [4] Where values in bracket denotes the occurrence of that series. I need to sort this data based on the occurrence of the data descending with maximum elements on the top as follows 65 28 54 73 [52] 22 28 65 73 [42] 65 54 57 73 [22] 65 22 54 73 [12] 22 28 54 73 [4] 28 59 71 [122] 73 54 57 [52] 22 28 65 [26] .. . . . and so on... Can someone give me a quick code for this. Thanks in advance.

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  • How do you use kate? Tips/Tricks/Workflow

    - by Roman A. Taycher
    We all seen a bunch of these? Mostly for IDE's but also for vim and emacs. Kate is (only) a text editor (an awesome one) but it has a ton of options plus a number of plugins, so its hard to know all of it well. How do use the Kate text editor? Please share your workflow and help me and others learn some of the cool tricks you use. I'll start I use the built in terminal a lot opening files quickly, and using it as an enhanced haskell repl with ghci (since ghci doesn't allow you all to just put in all kinds of haskell code). Also use split views to quickly compare files (especially different versions of the same file). Also the auto-complete maybe simple(more use for saving typing time then remembering functions) but it works really well for that. Also if You highlight something and hit a start [/{/( it puts it in between brackets rather then replacing it with a bracket(why the hell do a lot of IDEs not have this feature).

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  • white in the black [closed]

    - by gcc
    how can i detect white image surrounded by black image 000 000 000 000 000 255 255 255 000 000 255 255 255 000 000 255 255 255 000 000 000 000 000 000 000 and how can calculate length and widht of the square

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  • Pound symbol not displaying on web page

    - by Gublooo
    Hello I have a mysql database table to store country name and currency symbol - the CHARSET has correctly set to UTF8. This is example data inserted into the table insert into country ( country_name, currency_name, currency_code, currency_symbol) values ('UK','Pounds','GBP','£'); When I look in the database - the pound symbol appears fine - but when I retrieve it from the database and display it on the website - a weird square symbol shows up with a question mark inside instead of the pound symbol. You can look at it here - http://www.didyouswipe.com/profile/view-profile/user_id/181 Please advice Thanks

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  • Create Dynamic Images using Base Image

    - by Karthik Kastury
    I am creating a Google Maps Social Application.. I have a basic marker that has a blank square in between it where I need to put the user uploaded picture. I already have the user uploaded pictures. Now How do I create these dynamic markers using PHP.. The accepted pictures are jpeg and png. I have heard of the PHP GD Library and would like to know how I can accomplish the task..

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  • php problem with function

    - by moustafa
    i have this function drawBoard(){ global $cBoard; $R = "<img src=rp.gif>"; //Red piece $B = "<img src=bp.gif>"; //black piece $ES = "<img src=blank.gif>"; // legal square image $IS = "<img src=blank1.gif>"; //illegal square image $cBoard = array( array($IS, $R, $IS, $R, $IS, $R, $IS, $R), array($R, $IS, $R, $IS, $R, $IS, $R, $IS), array($IS, $R, $IS, $R, $IS, $R, $IS, $R), array($ES, $IS, $ES, $IS, $ES, $IS, $ES, $IS), array($IS, $ES, $IS, $ES, $IS, $ES, $IS, $ES), array($B, $IS, $B, $IS, $B, $IS, $B, $IS), array($IS, $B, $IS, $B, $IS, $B, $IS, $B), array($B, $IS, $B, $IS, $B, $IS, $B, $IS) ); echo "<table border='3' width='200'>n"; foreach ($cBoard as $row){ switch($row){ case "8": $row = 0; break; case "7": $row = 1; break; case "6": $row = 2; break; case "5": $row = 3; break; case "4": $row = 4; break; case "3": $row = 5; break; case "2": $row = 6; break; case "1": $row = 7; break; } echo "<tr>n"; foreach ($row as $piece){ echo "<td>"; echo "$piece "; echo "</td>n"; switch($Piece){ case "A": $piece = 0; break; case "B": $piece = 1; break; case "C": $piece = 2; break; case "D": $piece = 3; break; case "E": $piece = 4; break; case "F": $piece = 5; break; case "G": $piece = 6; break; case "H": $piece = 7; break; } } } echo "</tr>n"; echo "</table>n"; } now im trying to parse a file into the array with color codes how i can do that

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  • Use case modelling for calculator

    - by kyrogue
    hi, i need help modelling a use case diagram from a topic, it will be in java GUI Design a Calculator that 1.Allow user to key in a legitimate arithmetic statement that involves number, operator +, - and bracket '(' and ')' ; 2.When user press “Calculate” button, display result; 3.Some legitimate statement would be ((3+2)-4+2) (equals 3) and (-2+3)-(3-1) (equals -1); 4.You should NOT use a pre-existing function that just take in the statement as a parameter and returns the result but you should write the logic of parsing every character in your code. 5.Store the last statement and answer so it is displayed when user press the “Last calculation” button. i have designed two use case diagrams using UML on netbeans 6.5.1, one of the use case i am not sure whether is it containing too much use cases etc, while the other is what i think could be too vague for the topic.i hope to get some feedback on whether the use case diagram are appropriate, thanks.

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  • Accessing E4X nodes having special characters in name without breaking binding chain in flex.

    - by Jonas
    I am using E4X to bind some values from xml in flex 3. There is a problem when xml tag's (or attribute's) name has special character in it: having xml content var xml:XML = <tag> <special-name att="val" /> </tag> special-name could not be accessed using xml.special-name.@att because it is interpreted as subtraction, on the other hand using square bracket notation xml['special-name'].@att breaks binding chain. Is there an elegant way to solve this (like special language syntax) without writing custom binding setters and listeners?

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  • Is there a web service for real estate data?

    - by Jen
    I am looking to access an online database of real estate information (e.g. tax information and sales history for a particular address, lot size, square footage, BPOs, etc.). Companies such as RealQuest offer reports as a subscription service, but I'm looking to download the raw data, preferably in XML format (I don't want to parse the output since the presentation could change without notice). Are there any such services available?

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  • Castle ActiveRecord Table name conflict

    - by Shane
    When you run into a reserved word like "User" in NHibernate you would just put single quotes around the offending text and nHibernate will surround the text with square brackets for querying. My question is how do you do the same thing using Castle.ActiveRecord?

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  • vs10 intellisense for jQuery

    - by justSteve
    I'm not able to get intellisense to work with javascript/jquery code in vs10. Not even getting highlighted opening/closing bracket and parens, much less autocomplete. In VS08 we had to install a patch to get intellisense for jquery. VS10 doesn't need that patch to support -vsdoc files. There was a bug in 08's intellisense that, if any of a project's included .js files had an error, we'd lose intellisense for javascript. That was supposed to be fixed in vs10. What the current set of troubleshooting steps to enable intellisense for VS10? thx

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  • SEARCHING AND REPLACING BRACKETS IN A STRING IN ORACLE 10G

    - by Tunde
    hello, Thanks as usual for your prompt and kind suggestions. i am currently developing a function that is meant to execute dynamically created SQL statements. this is done by concatenating the columns and fetching them via cursors. the problem is that when there is a function with a comma between its arguments, the concat concatenates the contents of the functions inclusive. Is it possible to skip contents of every bracket found in a string using REGEXP_SUBTR or REGEXP_REPLACE? Many thanks for the anticipated response.

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  • Drawing a seat area in wpf.Advice needed

    - by devnet247
    Hi, New to wpf I am after some advice,pointers-articles-codesnippets that can help me to write a usercontrol containing a seating area Lets say a cinema has 200 seats and it a square. I need to be able to draw 200 seats . What is the best way to draw seats?Would you draw 200 rectangles? Any suggestions

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  • Cepstral Analysis for pitch detection

    - by Ohmu
    Hi! I'm looking to extract pitches from a sound signal. Someone on IRC just explain to me how taking a double FFT achieves this. Specifically: take FFT take log of square of absolute value (can be done with lookup table) take another FFT take absolute value I am attempting this using vDSP I can't understand how I didn't come across this technique earlier. I did a lot of hunting and asking questions; several weeks worth. More to the point, I can't understand why I didn't think of it. I am attempting to achieve this with vDSP library. it looks as though it has functions to handle all of these tasks. However, I'm wondering about the accuracy of the final result. I have previously used a technique which scours the frequency bins of a single FFT for local maxima. when it encounters one, it uses a cunning technique (the change in phase since the last FFT) to more accurately place the actual peak within the bin. I am worried that this precision will be lost with this technique I'm presenting here. I guess the technique could be used after the second FFT to get the fundamental accurately. But it kind of looks like the information is lost in step 2. as this is a potentially tricky process, could someone with some experience just look over what I'm doing and check it for sanity? also, I've heard there is an alternative technique involving fitting a quadratic over neighbouring bins. Is this of comparable accuracy? if so, I would favour it, as it doesn't involve remembering bin phases. so questions: does this approach makes sense? Can it be improved? I'm a bit worried about And the log square component; there seems to be a vDSP function to do exactly that: vDSP_vdbcon however, there is no indication it precalculates a log-table -- I assume it doesn't, as the FFT function requires an explicit pre-calculation function to be called and passed into it. and this function doesn't. Is there some danger of harmonics being picked up? is there any cunning way of making vDSP pull out the maxima, biggest first? Can anyone point me towards some research or literature on this technique? the main question: is it accurate enough? Can the accuracy be improved? I have just been told by an expert that the accuracy IS INDEED not sufficient. Is this the end of the line? Pi PS I get SO annoyed (npi) when I want to create tags, but cannot. :| I have suggested to the maintainers that SO keep track of attempted tags, but I'm sure I was ignored. we need tags for vDSP, accelerate framework, cepstral analysis

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  • AVD properties for Motorola Flipout?

    - by kefs
    I'm looking to create AVDs to test my apps on, and i'm trying to figure out the correct settings for a square screen such as the new Motorola Flip Out. I don't see a wikipedia article for it, or many specs... On a related note, what about tablets? Actually.. Why aren't there a set of AVD instances with params from popular devices.. or at least a site that lists them for each of the 60+ devices. Thanks in advance :)

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  • Scrollbar skininng problem

    - by simplemagik
    I'm skinning scrollbar in my flex app and got one problem. This white square between scrollbars(view the image) ruibs all my design and i need to disable it, make it invisible, change it background color, alpha or smth like this. I can paste some code here but i think there is no need in it. Working in Flex 3. any ideas? image

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  • Calculating rotation and translation matrices between two odometry positions for monocular linear triangulation

    - by user1298891
    Recently I've been trying to implement a system to identify and triangulate the 3D position of an object in a robotic system. The general outline of the process goes as follows: Identify the object using SURF matching, from a set of "training" images to the actual live feed from the camera Move/rotate the robot a certain amount Identify the object using SURF again in this new view Now I have: a set of corresponding 2D points (same object from the two different views), two odometry locations (position + orientation), and camera intrinsics (focal length, principal point, etc.) since it's been calibrated beforehand, so I should be able to create the 2 projection matrices and triangulate using a basic linear triangulation method as in Hartley & Zissermann's book Multiple View Geometry, pg. 312. Solve the AX = 0 equation for each of the corresponding 2D points, then take the average In practice, the triangulation only works when there's almost no change in rotation; if the robot even rotates a slight bit while moving (due to e.g. wheel slippage) then the estimate is way off. This also applies for simulation. Since I can only post two hyperlinks, here's a link to a page with images from the simulation (on the map, the red square is simulated robot position and orientation, and the yellow square is estimated position of the object using linear triangulation.) So you can see that the estimate is thrown way off even by a little rotation, as in Position 2 on that page (that was 15 degrees; if I rotate it any more then the estimate is completely off the map), even in a simulated environment where a perfect calibration matrix is known. In a real environment when I actually move around with the robot, it's worse. There aren't any problems with obtaining point correspondences, nor with actually solving the AX = 0 equation once I compute the A matrix, so I figure it probably has to do with how I'm setting up the two camera projection matrices, specifically how I'm calculating the translation and rotation matrices from the position/orientation info I have relative to the world frame. How I'm doing that right now is: Rotation matrix is composed by creating a 1x3 matrix [0, (change in orientation angle), 0] and then converting that to a 3x3 one using OpenCV's Rodrigues function Translation matrix is composed by rotating the two points (start angle) degrees and then subtracting the final position from the initial position, in order to get the robot's straight and lateral movement relative to its starting orientation Which results in the first projection matrix being K [I | 0] and the second being K [R | T], with R and T calculated as described above. Is there anything I'm doing really wrong here? Or could it possibly be some other problem? Any help would be greatly appreciated.

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  • Using colon syntax and variables in Sass

    - by corroded
    I am still using the old colon syntax (I prefer it more than the bracket syntax) and this particular code: a.button-link +box($main-color) +border-radius(5px) :background :color $main-color :color #fff :padding 5px generates a warning like so: DEPRECATION WARNING: On line 12, character 3 of '/Users/eumir/rails_apps/dxconnect/app/ stylesheets/partials/utilities/_link-styles.sass' Setting properties with = has been deprecated and will be removed in version 3.2. Use "background: $main-color" instead. I tried that but my background color still doesn't show up. Any help on this please? Thanks!

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  • JQuery: calling ajax on drop element

    - by Lukasz Baran
    $("div.square").droppable({ accept: '.white', drop: function (event, ui) { $to = "#" + $(this).attr('id'); alert(to); $.post( "/Game/AddMove", { from: $from, to: $to, GameID: $("#gameID").val() }); } }); Well it's nor working. So I must ask, is it possible to call AJAX on droping some UI element ? The problem is, it's not even calling an controller,

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  • How does the OpenGL ES template work for the iPhone?

    - by thyrgle
    So, I've been trying to figure out why the square is moving up and down the iPhone simulator when Build and Go the template that Apple provides for OpenGL ES. I don't understand why for example they have ES1Render.m, and ES2Render.m instead of just one ESRender.m. Also, where is the equivalent of the glutDisplayFunc, and glutTimerFunc? Thanks in advance.

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