title: How to calculate the standard deviation for every 100 points in a nx3 vector?
body: <p>Suppose I have a matrix with <em>n</em> rows, each containing three coordinates, (x, y and z). I want to calculate the standard deviation for every 100 set of points in MATLAB. For example, for the first 100 x coordinates I apply <a href="http://www.mathworks.com/help/matlab/ref/std.html" rel="nofollow"><code>std</code></a>, then same for the y and z coordinates, and so on... eventually I have one set of x, y and z values for every 100 points. How do I do that?</p>