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  • How to calculate a latlng on google map ceartain distance away from another?

    - by Rene Saarsoo
    To draw a circle on map I have a center GLatLng (A) and a radius (r) in meters. Here's a diagram: ----------- --/ \-- -/ \- / \ / \ / r \ | *-------------* \ A / B \ / \ / -\ /- --\ /-- ----------- How to calculate the GLatLng at position B? Assuming that r is parallel to the equator. Getting the radius when A and B is given is trivial using the GLatLng.distanceFrom() method - but doing it the other way around not so. Seems that I need to do some heavier math.

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  • Lua choose random item from table

    - by Zen
    Seems easy but I just don't get any further: Take this example: local myTable = { 'a', 'b', 'c', 'd' } print( myTable[ math.random( 0, #myTable - 1 ) ] ) Why doesn't it work? Google seems to have no answers on this either

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  • matrices&searching [closed]

    - by gcc
    question 1) between different characters&real numbers , finding specific one how could i do question 2) myfriend asked me a good question : can we divide two matrices to each other // in math , we havenot learned but maybe someone knows where we find the answer

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  • How to access the elements in <script> inside the body tag

    - by Geetha
    Hi All, I am using <script> inside the body tag. <script type="text/javascript" language="javascript"> $('#audioVolume').text($('#audioVolume').text(Math.round((document.mediaPlayer.Volume + 2000) / 10) + "%")); </script> Error: Microsoft JScript runtime error: 'undefined' is null or not an object. Need: I want to access the html elements in <script inside the body tag.

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  • C++ open source projects

    - by Chaoz
    Hello, I'm looking for a suitable open source project to work on in C++. It really can be anything. My background is in gaming, on both PC and consoles; but I'd prefer to work on something low latency or real time. I'm also interested in Math stuff. Do any of you guys have suggestions?

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  • Scaling textSize in a TextView

    - by fiXedd
    Say I have a TextView of a particular size (doesn't really matter what... fill_parent, 20dip, whatever). Is it possible to tell the text to shrink/grow in size to fit the available space without doing a lot of math?

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  • How to convert from base-256 to base-N, where N is higher than 16?

    - by mark
    Dear ladies and sirs. I need to convert an array of bytes to another base, namely 85. In math terms the question is how to convert from base-256 to base-85 in the most efficient way? This question is inspired by my previous question - http://stackoverflow.com/questions/2827627/what-is-the-most-efficient-way-to-encode-an-arbitrary-guid-into-readable-ascii-3 Thanks.

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  • round() for float in C++

    - by Roddy
    I need a simple floating point rounding function, thus: double round(double); round(0.1) = 0 round(-0.1) = 0 round(-0.9) = -1 I can find ceil() and floor() in the math.h - but not round(). Is it present in the standard C++ library under another name, or is it missing??

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  • returning aligned memory with new?

    - by Steve
    I currently allocate my memory for arrays using the MS specific mm_malloc. I align the memory, as I'm doing some heavy duty math and the vectorization takes advantage of the alignment. I was wondering if anyone knows how to overload the new operator to do the same thing, as I feel dirty malloc'ing everywhere (and would eventually like to also compile on Linux)? Thanks for any help

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  • How to figure out if two CGRect intersect?

    - by mystify
    In -drawRect: I want to check if the provided rect intersects with anotherRect. I'm not good at this geometry math stuff and especially at english so what I want to say is: If you have two sheets of paper on the desk, and one of them covers the other either completely or just a small portion, it is rectsIntersect = YES. How to check that out for rect and anotherRect?

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  • Computing e^(-j) in C..

    - by Erkan H
    I need to compute imaginary exponential in C. As far as I know, there is no complex number library in C. It is possible to get e^x with exp(x) of math.h, but how can I compute the value of e^(-j), where j = sqrt(-1)?

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  • C# float to decimal conversion

    - by Adrian4B
    Any smart way to convert a float like this: float f = 711989.98f; into a decimal (or double) without loosing precision? I've tried: decimal d = (decimal)f; decimal d1 = (decimal)(Math.Round(f,2)); decimal d2 = Convert.ToDecimal(f);

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  • How to "grep" out specific line ranges of a file

    - by Mike
    There are often times I'll grep -l whatev file to find what I'm looking for. Say the output is 1234: whatev 1 5555: whatev 2 6643: whatev 3 If I want to then just extract the lines between 1234 and 5555, is there a tool to do that? For static files I have a script that does wc -l of the file and then does the math to split it out with tail & head but that doesn't work out so well with log files that are constantly being written to.

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  • Getting Frequency Components with FFT

    - by ruhig brauner
    so I was able to solv my last problem but i stubmled upon the next already. So I want to make a simple spectrogram but in oder to do so I want to understand how FFT-libaries work and what they actually calculate and return. (FFT and Signal Processing is the number 1 topic I will get into as soon as I have time but right now, I only have time for some programming exercises in the evening. ;) ) Here I just summarized the most important parts: int framesPerSecond; int samplesPerSecond; int samplesPerCycle; // right now i want to refresh the spectogram every DoubleFFT_1D fft; WAVReader audioIn; double audioL[], audioR[]; double fftL[], fftR[]; ..... framesPerSecond = 30; audioIn= new WAVReader("Strobe.wav"); int samplesPerSecond = (int)audioIn.GetSampleRate(); samplesPerCycle = (int)(audioIn.GetSampleRate()/framesPerSecond); audioL = new double[samplesPerCycle*2]; audioR = new double[samplesPerCycle*2]; fftL = new double[samplesPerCycle]; fftR = new double[samplesPerCycle]; for(int i = 0; i < samplesPerCycle; i++) { // don't even know why,... fftL[i] = 0; fftR[i] = 0; } fft = new DoubleFFT_1D(samplesPerCycle); ..... for(int i = 0; i < samplesPerCycle; i++) { audioIn.GetStereoSamples(temp); audioL[i]=temp[0]; audioR[i]=temp[1]; } fft.realForwardFull(audioL); //still stereo fft.realForwardFull(audioR); System.out.println("Check"); for(int i = 0; i < samplesPerCycle; i++) { //storing the magnitude in the fftL/R arrays fftL[i] = Math.sqrt(audioL[2*i]*audioL[2*i] + audioL[2*i+1]*audioL[2*i+1]); fftR[i] = Math.sqrt(audioR[2*i]*audioR[2*i] + audioR[2*i+1]*audioR[2*i+1]); } So the question is, if I want to know, what frequencys are in the sampled signal, how do I calculate them? (When I want to print the fftL / fftR arrays, I get some exponential formes at both ends of the array.) Thx :)

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  • jquery .live() click multiple times

    - by user355227
    Hi, I am trying to make a script that updates the captcha image, that is loaded through live() function... It works, but it only updates the image 1 time on firefox, 2 times on safari... How can I make this to work multiple times? jquery 1.4.2 relevant part of code: /* captcha image change */ var rand = Math.random(); $('a.captcha_refresh').live('click', function() { $('img.captcha').attr("src", 'captchashow.php?sid=' + rand); }); thanks, brm

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  • Calculate QuaterlyHour from Given two DateTimes in c#

    - by user281947
    I want to calculate the quarter Hour from the given two datetimes: Suppose datetime1 and datetime2 , i am doing somewhat like this : int d = datetime2.Subtract(datetime1).Hours; double l = Math.Round(Convert.ToDouble(d/4)); but if the QuarterHour is 3 (ie d=3), whats the good way to show the output- should it be zero or the round one : 3/4 = 0.75. so should i round up to 1 or 0 is ok. And if round up to 1..how should i?

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  • Android 2.1 switch loop JRE 1.7

    - by Defuzer
    Hello how to use switch loop in my android project ? I want to use Android 2.1 I need JRE 1.7, but I want to use Android 2.1 I use loop like this: switch ((CHAR[Math.abs(intGen.nextInt()%2)])) { case "+": result = random2 + random3; break; case "-": result = random2 + random3; break; } LogCat: Cannot switch on a value of type String for source level below 1.7. Only convertible int values or enum variables are permitted

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  • Client Side pagination with jQuery

    - by TheNone
    I have tried to write a script for pagination contents of an element with jQuery: <script type="text/javascript"> $(document).ready(function(){ var per_page = 2; var num_item = $('#en1').children().size(); var num_page = Math.ceil(num_item/per_page); $('#current_page').val(0); $('#per_page').val(per_page); var navigation_html = ''; var current = 0; while(num_page > current){ navigation_html += '<a class="page_link" href="javascript:paginate(' + current +')" longdesc="' + current +'">'+ (current + 1) +'</a>'; current++; } $('#page_navigation').html(navigation_html); $('#page_navigation .page_link:first').addClass('active_page'); $('#en1').children().css('display', 'none'); $('#en1').children().slice(0, per_page).css('display', 'block'); }); function paginate(page_num){ var per_page = parseInt($('#per_page').val()); start = page_num * per_page; finish= start + per_page; $('#en1').children().css('display', 'none').slice(start, finish).css('display', 'block'); $('.page_link[longdesc=' + page_num +']').addClass('active_page').siblings('.active_page').removeClass('active_page'); $('#current_page').val(page_num); } </script> http://jsfiddle.net/kqfyL/9/ This script paginate the contents of element by id "en1". I want to paginate 4-5 element (en2, en3, ...). When I insert code inside o document ready in a function, pagination doesnt work: function init(myId){ var ID = document.getElementById("myId"); var per_page = 6; var num_item = $(ID).children().size(); var num_page = Math.ceil(num_item/per_page); $('#current_page').val(0); $('#per_page').val(per_page); var navigation_html = ''; var current = 0; while(num_page > current){ navigation_html += '<a class="page_link" href="javascript:paginate(' + current +')" longdesc="' + current +'">'+ (current + 1) +'</a>'; current++; } $('#page_navigation').html(navigation_html); $('#page_navigation .page_link:first').addClass('active_page'); $('#ID').children().css('display', 'none'); $('#ID').children().slice(0, per_page).css('display', 'block'); } init(en1); What is wrong in init function? Thanks in advance

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  • Write a JavaScript that accepts a number from the user using the “prompt” function

    - by A sw A
    Write a JavaScript that accepts a number from the user using the “prompt” function. Then it draws a table in the HTML document that has the user specified number of rows and columns. In each table data, it displays the result of the math operation (row raised to the power of column). For example, if the user enters the number 3, the JavaScript should draw the following table: 1 1 1 2 4 8 3 9 27

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  • I want to check if $('#td1').text() === "x"?

    - by M.z
    I want to check if innerHtml have X or O , so i can not add again any thing else , but it's not working . it stop after adding the check code , I'm trying here to do a simple X O game to get more familiar with javascript and jquery . also I'm not sure if can do this with jQuery . <script type="text/javascript" > function ranFun() { return Math.floor((Math.random() * 9) + 1); } var a; function Elment(a) { document.getElementById("td" + a).innerHTML = "O"; } function call() { var x = ranFun(); switch (x) { case 1:case 2 :case 3: case 4 :case 5 : case 6 : case 7 : case 8 : case 9 : Elment(x); break; default: break; } } function tdElm(c) { if ($('#td1').text() === "x" || $('#td1').text() == "o") return false; else { document.getElementById("td" + c).innerHTML = "x"; call(); } } </script> <BODY> <center> <h1 >" X ,O Game "</h1> <table > <tr> <td id="td1" onclick="tdElm(1);" ></td> <td id="td2" onclick="tdElm(2);"></td> <td id="td3" onclick="tdElm(3);"></td> </tr> <tr> <td id="td4" onclick="tdElm(4);"></td> <td id="td5" onclick="tdElm(5);"></td> <td id="td6" onclick="tdElm(6);"></td> </tr> <tr> <td id="td7" onclick="tdElm(7);"></td> <td id="td8" onclick="tdElm(8);"></td> <td id="td9" onclick="tdElm(9);"></td> </tr> </table> </center> </BODY>

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