http://www.mathworks.com/matlabcentral/newsreader/view_thread/243039 Feed for thread: Skewing a 2D grid to fit experimental data en-us &copy;1994-2012 by MathWorks, Inc. webmaster@mathworks.com MATLAB Central Newsreader http://blogs.law.harvard.edu/tech/rss 60 http://www.mathworks.com/images/membrane_icon.gif Sat, 24 Jan 2009 10:52:01 -0500 http://www.mathworks.com/matlabcentral/newsreader/view_thread/243039#623672 Peter I have a set of XY data points that should lie on a regular gird. But as the data is experimental data it suffers from skewing and squashing etc. I would like to to be able to take what should be a perfect grid and somehow fit it to my experimental data. Then I would be able make predictions about the locations of the next set of grid points outside my experimental data.<br> <br> Can anybody point me in the direction of a function that may do this?<br> <br> The data comes from scanning tunnelling microscope images of surface crystals. These images suffer from thermal and piezo drift which skews and squashes the image. Once I've located a few of the positions of the unit cells in the image I would like to be able to make predictions as to where the others may be. Hence the fitting of the 2D grid. Sat, 24 Jan 2009 11:40:21 -0500 http://www.mathworks.com/matlabcentral/newsreader/view_thread/243039#623675 Per Sundqvist "Peter " &lt;peter@nprl.ph.bham.ac.uk&gt; wrote in message &lt;glersh$89q$1@fred.mathworks.com&gt;...<br> &gt; I have a set of XY data points that should lie on a regular gird. But as the data is experimental data it suffers from skewing and squashing etc. I would like to to be able to take what should be a perfect grid and somehow fit it to my experimental data. Then I would be able make predictions about the locations of the next set of grid points outside my experimental data.<br> &gt; <br> &gt; Can anybody point me in the direction of a function that may do this?<br> &gt; <br> &gt; The data comes from scanning tunnelling microscope images of surface crystals. These images suffer from thermal and piezo drift which skews and squashes the image. Once I've located a few of the positions of the unit cells in the image I would like to be able to make predictions as to where the others may be. Hence the fitting of the 2D grid.<br> <br> Try the interpolation:<br> <br> help griddata<br> <br> /Per