http://www.mathworks.com/matlabcentral/newsreader/view_thread/276267 Feed for thread: plot a shape-preserving interpolant to XY en-us &copy;1994-2010 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 Fri, 12 Mar 2010 10:08:06 -0500 http://www.mathworks.com/matlabcentral/newsreader/view_thread/276267#725754 Matthias Dear all,<br> <br> I wish to fit and plot a shape-preserving interpolant line to my XY data points, and only display the fit on the plot - not the XY data. <br> <br> This is possible by first plotting the data and using a white maker, followed by basic fitting from the Tools menu. But what I am really after is a way of automating this step by building such a procedure into my own m-files. <br> <br> Generating an m-file from my figure results in an error messages that makes no sense to me: "pvpmod needs either a structure of a cell array with parameter/value pairs"<br> <br> I also tried to follow the help file on the use pchip, but this generated completely different results to what the GUI approach yielded. <br> <br> How exactly does one manually reproduce this shape-preserving interpolant that can be obtained from Tools --&gt; Basic fitting?<br> <br> <br> <br> <br> <br> &nbsp;