coordinates

Goal I want to determine if a test point is within a defined quadrilateral. I'm probably going to implement the solution in Matlab so I only need pseudo-code. Inputs Corners of quadrilateral : (x1,y1) (x2,y2) (x3,y3) (x4,y4) Test point : (xt, yt) Output 1 - If within quadrilateral 0 - Otherwise Update It was pointed out that identifying the vertices of the quadrilateral is not enough to uniquely identify it. You can assume that the order of the points determines the sides of the quadrilateral (point 1 connects 2, 2 connects to 3, 3 connects to 4, 4 connects to 1) Use inpolygon . Usage would be

I just can't find it. How to set up axis and labels in matlab so they cross at zero point, with the labels just below the axis not on left/bottom of the plot ? If I didn't make myself clear - I just want the plot to look like like we all used to draw it when in school. Axes crossing, 4 quadrants, labels right below axis, curve ... as it goes. Anyone knows how to set it up ? You should check out two submissions on The MathWorks File Exchange : PlotAxisAtOrigin by Shanrong Zhang axescenter by Matt Fig Hopefully these will work with whatever MATLAB version you have (the submission from Matt Fig

I am using an SQLITE database to store latitudes and longitudes of locations. I want to be able to sort the results by rough distance from the current location. I already have the current location of the device as a double (lat, lng), the lat and lng in the database are also doubles. What I want is a query that will create a virtual column that I am able to sort the results by. I currently use a function to show the distance for a selected record: float pk = (float) (180/3.14159); float a1 = (float) (db_lat / pk); float a2 = (float) (db_lon / pk); float b1 = (float) (current_lat / pk); float

How can I convert this: 26.72773551940918 Into something like this: 22°12'42"N The trick here is that the coordinates are, actually Latitude and Longitude, I just need to format them correctly. You can find functions to do that here <?php function DMStoDEC($deg,$min,$sec) { // Converts DMS ( Degrees / minutes / seconds ) // to decimal format longitude / latitude return $deg+((($min*60)+($sec))/3600); } function DECtoDMS($dec) { // Converts decimal longitude / latitude to DMS // ( Degrees / minutes / seconds ) // This is the piece of code which may appear to // be inefficient, but to avoid

I am working on a project in javascript involving google maps. The goal is to figure out 16-20 coordinate points within n kilometers from a set of latitude longitude coordinates such that the 16 points if connected will form a circle around the original coordinates. The end goal is to make it so I can figure out coordinates to plot and connect on google maps to make a circle around a given set of coordinates. The code would go something like: var coordinates = Array(); function findCoordinates(lat, long, range) { } coordinates = findCoordinates(-20, 40, 3); Now to make the magic happen in the

I have simple UIWebView with loaded html. I want to show the PopoverView pointed to the selected text. I can get the menuFrame of the UIMenuController and use its rect, but the result isn't as accurate at the corners of the screen as I need. I can calculate the screen size and get menuFrame rect and then I can suppose where the selection may be found, but I want exactly know where is the selected text. Is it generally possible? hwaxxer You can use the javascript function getBoundingClientRect() on the range object of the selected text. This is how I do it: function getRectForSelectedText() {