tuxzz

# PMX 2.0 file format #

This is a description of the PMX file format. This is used for 3D models in Miku Miku Dance (MMD). 

Since I couldn't find any English descriptions of the PMX file format, I've made this, which is translated from http://gulshan-i-raz.geo.jp/labs/2012/10/17/pmx-format1/. I haven't used this file format yet, so please don't ask me what everything means.
An English guide to the PMD file format, which preceeded PMX, can be found here: http://mikumikudance.wikia.com/wiki/MMD:Polygon_Model_Data.

If you want to learn more, there are some open source projects on GitHub which can read this format, so go take a look at them.

Note: fields with type text begins with an int (32 bit) with how many bytes of text the section is.

tuxzz

function levinson(R,L)
    a = zeros(L,L)
    P = zeros(1,L)

    # for m = 1
    a[1,1] = -R[2]/R[1]
    P[1] = R[1]*(1-a[1,1]^2)

    # for m = 2,3,4,..L
    for m = 2:L

tuxzz

function arcov(x,L)
    N = length(x)
    phi = zeros(L+1,L+1)
    for k = 0:L, i=0:L, n=L:N-1
        phi[k+1,i+1] += x[n+1-k]*x[n+1-i]
    end
    phi = phi./(N-L)

    a = phi[2:end,2:end]\-phi[2:end,1]
    P = phi[1,1] + phi[1,2:end]*a

tuxzz

function armcov(x,L)
    N = length(x)
    phi = zeros(L+1,L+1)
    for k = 0:L, i=0:L, n=0:N-L-1
        phi[k+1,i+1] += x[n+1+k]*x[n+1+i] + x[n+1+L-k]*x[n+1+L-i]
    end
    phi = phi./(2*(N-L))

    a = phi[2:end,2:end]\-phi[2:end,1]
    P = phi[1,1] + phi[1,2:end]*a

tuxzz

function arburg(x,p)
    N = length(x)

    P = zeros(1,p+1)
    f = zeros(p+1,N)
    b = zeros(p+1,N)
    a = zeros(p,p)

    # Initialisation
    f[1,:] = x