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functionfitter.plot - Function

	Package	utility
	Module	fitting
	Tool	functionfitter

Plot data and fit

Synopsis
plot(data, model, fit, resid)

Arguments

data	in	Plot the data and optional errors
		Allowed:	T or F
		Default:	T
model	in	Plot the model
		Allowed:	T or F
		Default:	T
fit	in	Plot the fit
		Allowed:	T or F
		Default:	T
resid	in	Plot the residual of the data and the fit
		Allowed:	T or F
		Default:	F

Returns
T or fail

Description

This function lets you plot the data and (optional) errors, model, fit and residuals of the data and fit.

Note that the model is evaluated from the internal functional and its parameters. If you have not explicitly set the parameters of the functional via the setparameters function, the model will evaluate to zero.

Note that at this point, the plotting interface has no impact on the x-space in which the fit is done. The fitting is always done in with the original x (abcissa) vector that you set.

Example

- include 'functionfitter.g'
- ff := functionfitter()
- x := 1:10
- y := 3 + 2*x
- yerr := 0.1*y;
- ff.setdata (x,y,yerr)               # Set data and y errors
- ff.setfunction ('p0 + p1*x')
- ff.setparameters ([2.8, 2.1])       # Set model (a bit wrong)
- ff.fit(fixed=[T,F])                 # Fit holding p0 fixed
- ff.plot()                           # Plot data, model & fit