qhad2: qhad2
In HadamardR: Hadamard Matrix Generation

Description Usage Arguments Details Value Examples

qhad2 creats the Quadratic residues of the prime number.

qhad2(p)

`p`	is the integer

The given input is prime number it retuns the matrix of order p. if the input is not prime number it returns NULL.

matrix of order p

qhad2(7)
#      [,1] [,2] [,3] [,4] [,5] [,6] [,7]
#[1,]    0   -1   -1    1   -1    1    1
#[2,]    1    0   -1   -1    1   -1    1
#[3,]    1    1    0   -1   -1    1   -1
#[4,]   -1    1    1    0   -1   -1    1
#[5,]    1   -1    1    1    0   -1   -1
#[6,]   -1    1   -1    1    1    0   -1
#[7,]   -1   -1    1   -1    1    1    0