Semiparametric model

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Template:Distinguish In linear algebra, an alternant matrix, is a matrix with a particular structure, in which successive columns have a particular function applied to their entries. An alternant determinant is the determinant of an alternant matrix. Such a matrix of size m × n matrix may be written out as

M=[f1(α1)f2(α1)fn(α1)f1(α2)f2(α2)fn(α2)f1(α3)f2(α3)fn(α3)f1(αm)f2(αm)fn(αm)]

or more succinctly

Mi,j=fj(αi)

for all indices i and j. (Some authors use the transpose of the above matrix.)

Examples of alternant matrices include Vandermonde matrices, for which fi(α)=αi1 and Moore matrices for which fi(α)=αqi1.

If n=m and the fj(x) functions are all polynomials we have some additional results: if αi=αj for any i<j then the determinant of any alternant matrix is zero (as a row is then repeated), thus (αjαi) divides the determinant for all 1i<jn. As such, if we take

V=[1α1α1n11α2α2n11α3α3n11αnαnn1]

(a Vandermonde matrix) then i<j(αjαi)=detV divides such polynomial alternant determinants. The ratio detMdetV is called a bialternant. In the case where each function fj(x)=xmj, this forms the classical definition of the Schur polynomials.

Alternant matrices are used in coding theory in the construction of alternant codes.

See also

References

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  • 20 year-old Real Estate Agent Rusty from Saint-Paul, has hobbies and interests which includes monopoly, property developers in singapore and poker. Will soon undertake a contiki trip that may include going to the Lower Valley of the Omo.

    My blog: http://www.primaboinca.com/view_profile.php?userid=5889534
  • 20 year-old Real Estate Agent Rusty from Saint-Paul, has hobbies and interests which includes monopoly, property developers in singapore and poker. Will soon undertake a contiki trip that may include going to the Lower Valley of the Omo.

    My blog: http://www.primaboinca.com/view_profile.php?userid=5889534

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