Nothing
Nullspace = function(A,C,b,d){
stopifnot(is.numeric(A) & is.numeric(C) & is.numeric(b) & is.numeric(d))
RC = householder(t(C))$R # pracma library
QC = householder(t(C))$Q # pracma library
p = Rank(C) # pracma library
Q1C = QC[,1:p]
Q2C = QC[,(p+1):ncol(QC)]
x1 = ginv(C) %*% d
y2 = ginv(A %*% Q2C) %*% (b-A %*% x1)
x = x1+Q2C %*% y2
x
}
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