[R] please help

[Arnab Chowdhuri]

van=function(a,x,n){
A<<-matrix(c(x[1]^2,x[1],1,x[2]^2,x[2],1,x[3]^2,x[3],1),byrow=T,nrow=3)

for(i in 1:3){
o<<-x[i]
for(j in sort(1:n+1,decreasing=T)){
B[i][j]<<-(o)^(n+1-j)
}
}

y=vector(length=3)
y<<-B%*%a
p=vector(length=3)

p<<-solve(A,y)
return(p)
}


this is my function and I am getting an error mssg   "number of items to
replace is not a multiple of replacement length" for each assignment of
B[i][j].I am new in R. So please help.....this is a part of my entire
program..a is an n+1 length vector and x is a 3 length vector.

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