Calculate the determinant of a real or polynomial matrix
The determinant of the given square matrix.
pMdet(pm)
pm |
a |
A numeric or polynomial class polynom.
rd <- c(3,0:7) D <- polyMgen.a(3,3,rawData=rd,degree=1,symb="x") D # 3 5 + 6*x 2 + 3*x # 1 + 2*x 7 + 3*x 4 + 5*x # 3 + 4*x x 6 + 7*x pMdet(D) # 114 + 150*x + 22*x^2 + 6*x^3 elem <- function(x,k,j) (pMbas(x,c(rep(1,k-1),j),byrow=TRUE)$dlist[[k]])[[1]] d11 <- elem(D,1,1);d12 <- elem(D,1,2);d13 <- elem(D,1,3) d21 <- elem(D,2,1);d22 <- elem(D,2,2);d23 <- elem(D,2,3) d31 <- elem(D,3,1);d32 <- elem(D,3,2);d33 <- elem(D,3,3) polyMgen.d(3, 3, rawData=list(d11,d12,d13,d21,d22,d23,d31,d32,d33), symb="x", byrow=TRUE) # direct det calculation d11*d22*d33+d12*d23*d31+d13*d21*d32-(d13*d22*d31+d11*d23*d32+d12*d21*d33) # 114 + 150*x + 22*x^2 + 6*x^3 D <- polyMgen.a(3,3,rawData=rd,degree=0) D M <- matrix(rd, ncol = 3) M c(pMdet(D),det(M)) # det of a polyMatrix == det of a real matrix (!) # clean up # rm(D, d11, d12, d13, d21, d22, d23, d31, d32, d33, elem, M, rd)
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