survey (version 2.8-1)

hadamard: Hadamard matrices

Description

Returns a Hadamard matrix of dimension larger than the argument. Matrices of dimension every multiple of 4 are thought to exist, but this function doesn't know about them, so it will return matrices that are larger than necessary.

Usage

hadamard(n)

Arguments

n

lower bound for size

Value

• A Hadamard matrix

See Also

brrweights

Examples

image(hadamard(30))

plot(sapply(2:80,function(i) ncol(hadamard(i))),type="S",
     ylab="Matrix size",xlab="n",xlim=c(1,100),ylim=c(1,100))
abline(0,1,lty=2)
lines(2:80, 2:80-(2:80 %% 4)+4,col="purple",type="S")
legend(c(x=10,y=80),legend=c("Actual size","Minimum possible size"),
     lty=c(1,1),col=c("black","purple"),bty="n")