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Version 1.9 Build 1556

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lsfit.inityonly - Function

	Package	utility
	Module	mathematics
	Tool	lsfit

initialise the vector only

Synopsis
inityonly()

Description
For large numbers of equations, it may be too expensive to keep the coefficients of the input equations. In this case it is still possible to solve for a new yy-vector without a new inversion.

Example

lsf.init(nuk);	                  # initialise matrix and vector
for (i in [1:(nuk-1)]) {
    for (j in [(i+1):nuk]) {
        aa := rep(0,nuk);         # coefficient vector
        aa[i] := 1;
        aa[j] := 1;	
        lsf.accumulate(aa,yy1[i],wgt[i]);     # accumulate equation
    }
}
xx1 := lsf.solve();		# solve for input vector yy1

lsf.inityonly();	                  # initialise matrix and vector
for (i in [1:(nuk-1)]) {
    for (j in [(i+1):nuk]) {
        aa := rep(0,nuk);         # coefficient vector
        aa[i] := 1;
        aa[j] := 1;	
        lsf.accumulate(aa,yy2[i]);     # accumulate equation
    }
}
xx2 := lsf.solve();		# solve for vector yy2