RandomNumber generator for Vim

" George Marsaglia's Multiply-with-carry Random Number Generator
let s:m_w = matchstr(tempname(), '\d\+') * getpid()
let s:m_z = localtime()

function! RandomNumber()
  let s:m_z = s:m_z + (s:m_z / 4)
  let s:m_w = s:m_w + (s:m_w / 4)
  return abs((s:m_z) + s:m_w)      " 32-bit result
endfunction