CLsqFit:GetX

CLsqFit:GetX

The GetX method returns a 1-dimensional array containing the independent variable ("x") values for the n-th basis dimension, starting at 1. For example, if fitting one variable (that is, 1 basis dimension. or y(x)), then you do not need to specify the dimension. The returned table contains CLsqFit:GetNumPts() values.

Syntax

tX = CLsqFit:GetX()

tX = CLsqFit:GetX( nDim )

tX1, tX2, tX, tWt4 = CLsqFit:GetX()

nDim is the basis dimension to return, starting at 1. If only one dimension is dit, as in fitting the "x" value, then this parameter can be omitted.

tX is a 1-dimensional array containing the values of all points for the n-th dimension.

tX1, tX2, tX3, etc.are tables of all X values for every basis dimension. The number of tables returned equals the number of dimensions being fit. Each

Example

The following example shows how to fit a 2x3 polynomial to (x,y,z) data, then makes a scatter plot of the observed values against the y value (dimension 2) :

L = new_lsqfit()	-- create a CLsqFit object
L:SetNumCoefs( 2, 3 )	-- Fit a 2-D polynomial with 2x3 coefficients
L:AddPt( 3.1, 4.65, 12.5 )	-- add a point for x = 3.2, y = 4.65, z = 12.5
-- add more points to the fit
L:Fit()	-- Fit the polynomial
scatter( L:GetX( 2 ), L:GetObs() )	-- make a scatter plot of observed value against X[2]

Syntax

Example

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