Why does cscvn of matlab have 4*2*(n-1) coefficients?

Hello every body. I use the built in matlab function " cscvn " for periodic splines. It must have 4*(n-1) coefficients but in returns 4*2*(n-1). coefficients (n is the number of x values) ? Does anybody know why? I am looking forwrard to hear your answers.

Answer 1

[yanqi liu]

p = [0 1 1 0 -1 -1 0 0; 0 0 1 2 1 0 -1 -2];
size(p)

ans = 1×2

2 8

curve = cscvn(p)

curve = struct with fields:
      form: 'pp'
    breaks: [0 1 2 3.1892 4.3784 5.3784 6.5676 7.5676]
     coefs: [14×4 double]
    pieces: 7
     order: 4
       dim: 2

[Ashkan Rigi]

n is the number of x , not the number of all the points