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20 May 2013 In metrology, what do you do when your curve-fitting software program doesn't work because you're dealing with a non-linear equation? Excel installation, but a web search for “Solver Excel Install Add in” should give instructions for your specific version of Excel. GNU Plot: www.gnuplot.info/. The fit command can fit a user-defined function to a set of data points (x,y) or (x,y,z), using an implementation of the nonlinear least-squares (NLLS) 13 Nov 2013 It primarily goes over the basics of how to plot and fit simple things with Gnuplot. This tutorial supposes the existance of a (sparse) data file with a rough14 Sep 2011 Linear and Non-linear fitting. Our goal in this tutorial is to learn how to use gnuplot to find a least-squares fit to experimental data. One key requirement is that our (T. Williams, C. Kelley - gnuplot 5.0, An Interactive Plotting Program). If you have a data set and want to fit if the command is very simple and natural: This manual was originally prepared by Dick Crawford. Version 5.2.5 (October 2018) Nonlinear coordinates systems . . Time/Date data. 49. II Plotting Clear. 73. Continue. 73. Do. 73. Evaluate. 73. Exit. 74. Fit. 74. Adjustable parameters . 13 Nov 2013 (T. Williams, C. Kelley - gnuplot 5.0, An Interactive Plotting Program). Linear interpolation (fitting with a line) is the simplest way to fit a data set. Assume you have