Download Curveexpert Basic
Tuula Zeoli
Now, we will take a step back to provide a framework ofoptimization methods. From the area of pure optimization, whichwill not be explained here, two basic ways of finding a functionminimum are a Taylor series based method and the steepest-descentmethod. The Taylor series method states that sufficiently close tothe minimum, the function can be approximated as a quadratic.Without detailed explanation of that method, a step from thecurrent parameters a to the best parameters amin can be written as
The biggest challenge with the ggplot2 was to fit the non-linear four parametric logistic function (y=d + a-d/1+ (x/c)^2) within my graph. Using the basic graph and the plotrix and dcr packages, I could easily (the matter of 1 code) create the graph that I wanted. Each time when I was trying to do it, the ggplot2 did not see the p, or t values. Moreover, it did not see the b, c, d, and e intercepts, and without them you cannot fit the non-linear regression line.
Graph components are added as layers basically. They can be seen in the left sidebar and added from the toolbar up top. Start by configuring the graph appearance, max values for X and Y, labels, etc. Graph data can be inputed manually or with TXT, CSV, HDF5, FITS, NPY/NPZ, QDP file imports. Curve fits are manually created by writing their equations (linear, exponential, quadratic, logarithmic, etc.), see sidebar to the left. Finished graphs with applied curve fits can be exported as either EPS, PDF, PNG, SVG, EMF. Other features available in Veusz include things like support for multiple axis, stepped plots, dataset creation and more. There are versions available for Linux, BSD and Mac.
Download a program called "Curve Expert" Just get the basic program, not the professional version. Input your data, and you will get a better fit than you want. From your graph, it could be a sinusoid, a polynomial, an inverse hyperbolic sine, a rational function, something built from the cumulative normal distribution, or some kind of logistic function.
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