CLsqFit:GetWt

The GetWt method returns a table containing the weights for all points in the data sample. If multichannel data are fit, the function returns 1 table for each data channel. The returned table contains CLsqFit:GetNumPts() values. To get the weight of a single point, use GetPtWt.

Syntax

tWt = CLsqFit:GetWt()

tWt = CLsqFit:GetWt( nChannel )

tWt1, tWt2, tWt3, tWt4 = CLsqFit:GetWt()

where

nChannel is the optional channel to select for multi-channel data.

tWt is a Lua table containing the weights assigned all points.

tWt1, tWt2, tWt3, tWt4 are tables of weights assigned to points that have multi-channel (e.g., RGB) values. The number of tables returned equals the number of channels.

Two formats are provided with a different number of return values. If the point uses single-channel data (i.e., typical numeric data) or you specify the channel, then a single table is returned. If the point involves multi-channel data, up to 4 tables will be returned. The number of tables returned equals the number of channels of data that were fit.

Example

The following example fitsreturns the number of fit points that had a weight >= 5.0:

L = CLsqFit:new()	-- create a CLsqFit object
L:SetNumCoefs( 2 )	-- set 2 coefficients to fit a line to single channel data
L:AddPtWt( 3.5, 5.15, 10 )	-- add a point for x = 3.5, obs = 5.15, weight = 10
-- add more points
L:Fit()	-- Fit the line
nHigh = 0	-- initialize a counter
for k,w in ipairs( L:GetWt() ) do	-- loop over all points k having weight w
if w > 5 then nHigh = nHigh + 1 end	-- w is the k-th weight
end
Printf("N weights > 5 = %d\n", nHigh )	--list the results