CLsqFit:SetNumChannels

The SetNumChannels method specifies the number of channels to fit. Use this method to set 3 or 4 channels, as for fitting RGB or RGBa data. This method need not be called if fitting numeric data of 1 channel (the default).

Syntax

CLsqFit:SetNumChannels( nChannels )

where

nChannels is the number of channels to use, in the range 1 to 4.

The SetNumChannels method set the number of channels for the data points. This method must be called before adding points using AddPt and AddPtWt. The default is 1 channel. The number of channels in current use may be retrieved using GetNumChannels.

Examples

The following script sets 3 channels, adds data points, and lists the number of channels in use:

L = CLsqFit:new()	-- create a CLsqFit object
L:SetNumChannels( 3 )	-- specify 3 channel data
L:AddPt( 3.5, "5,240.4,140" )	-- add a point for x = 3.5 and y = "5,240.4,140"
	-- add more points
L:Fit()	-- compute the fit
n = L:GetNumChannels()	-- get the number of channels in use
Printf( "nChan= %d\n", n )	-- result: nChan= 3

The next example does not call SetNumChannels, so the default number of channels, 1, is used. The script adds data points and then lists the number of channels in use:

L = CLsqFit:new()	-- create a CLsqFit object
L:AddPt( 3.5, 12.25 )	-- add a point for x = 3.5 and y = 12.25
	-- add more points
L:Fit()	-- compute the fit
n = L:GetNumChannels()	-- get the number of channels in use
Printf( "nChan= %d\n", n )	-- result: nChan= 1