area

I'm sure this is a simple question, but I can't seem to figure it out. I've got this plot and I want to add vertical lines and shade the area in between to highlight areas of the data. I feel like I should be able to do this using the area function, but can't seem to figure it out. The dates and values are all doubles and are two separate vectors, if that makes a difference. Any help would be greatly appreciated. zellus Very basic example about shading an area in a plot. Shading an area boundered by a curve might be of interest as well. figure; ha = area([4 6], [10 10]); hold on plot(1:10, 1

I have a cloud of points scattered in a 2D Euclidean space. I would like to calculate the area inside the polygon linking the most extreme (=peripheral) points of the cloud. In other words, I would like to estimate the area covered by the cloud in this space. Is there a formula in R? Thanks a lot for any response Julien This is called the convex-hull problem; R built-in chull function should do the work. To count area, you may use a formula from here . EDIT: Even better; splancs package has areapl function. So the function solving your problem should look like this: cha<-function(x,y){ chull(x

I have this var textarea=$('#content'); textarea.html(textarea.html().replace("PID","111111")); This works partially, but it only finds the first "PID" within the textarea and replaces it to "1111111". There are about 7 others I need to change as well. What I need is a way to find ALL "PID" and replace it with "111111". Thanks in advance. Use regex to replace all the occurrences in a string. Try this textarea.html(textarea.html().replace(/PID/g,"111111")); textarea.html(textarea.html().replace(new RegExp("PID","g"),"111111")); the "g" modifier performs a global search. 来源： https:/

I got an arbitrary shaped curve, enclosing some area. I would like to approximate the number of pixels that the curve is enclosing on an iPhone/iPad screen. How can I do so? A curve is defined as a successive x/y coordinates of points. A curve is closed. A curve is drawn by a user's touches (touchesMoved method), and I have no knowledge of what it looks like I was thinking of somehow filling the closed curve with color, then calculating the number of pixels of this color in a screenshot of a screen. This means I need to know how to programmatically fill a closed curve with color. Is there some

I'm getting quite desperate about this, I couldn't find anything on the www so far. Here's the situation: I am working with Python. I have 3 arrays: the x-coordinates, the y-coordinates and the radius. I want to create a scatter plot with the given x- and y-coordinates. So far, everything works how I want it to. Here is what's bothering me: The circle size of each point in the scatter plot should be defined by the radius array. The the values of the coordinates and the radius are in same units. More explicitly: Let's assume I have a point at (1, 1) with radius 0.5 assigned. Then I want to get