The SciDAVis Handbook
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Fitting to specific curves

SciDAVis include quick access to the most usefull functions for fitting.

Fitting to a line

This command is used to fit a curve which has a linear shape.

Figure 6-4. The results of a Fit Linear.

The results will be given in the Log panel:

Fitting to a polynome

This command is used to fit a curve which has a linear shape. The results will be given in the Log panel

Figure 6-5. The results of a Fit Polynomial..., showing the initial data, the curve added to the plot, and the results in the log panel.

Fitting to a Bolzmann function

This command is used to fit a curve which has a sigmoidal shape. The function used is:

Equation 6-3. Bolzmann equation

in which A2 is the high Y limit, A1 is the low Y limit, x0 is the inflexion point and dx is the width.

Figure 6-6. The results of a Fit Bolzmann (sigmoidal).

Fitting to a Gauss function

This command is used to fit a curve which has a bell shape. The function used is:

Equation 6-4. Gauss equation

in which A is the height, w is the width, xc is the center and y0 is the Y-values offset.

Figure 6-7. The results of a Fit Gaussian.

Fitting to a Lorentz function

This command is used to fit a curve which has a bell shape. The function used is:

Equation 6-5. Lorentz equation

in which A is the area, w is the width, xc is the center and y0 is the Y-values offset.

Figure 6-8. The results of a Fit Lorentzian.

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