change names in a table

gistfile1.r

  new_names = list(
                   e2u_p='E2U',
                   j2j_p='J2J',
                   u_p  ='U',
                   u2e_p='U2E',
                   'dlw_dlw_ee' = '$\\mbox{Cov}( \\Delta log(w_t) ,  \\Delta log(w_{t-1})|EE)$',
                   'dlw_ee_m'   = '$E( \\Delta log(w_t) | EE)$',
                   'dlw_ee_v'   = '$\\mbox{Var}( \\Delta log(w_t) | EE)$',
                   'dlw_j2j_v'  = '$\\mbox{Var}( \\Delta log(w_t) | J2J)$',
                   'dlw_j2j_m'  = '$E( \\Delta log(w_t) | J2J)$',
                   'lw_v'       = '$\\mbox{Var}(log(w_t | J2J)$',
                   'dlw_dlcw_ee_c'  = "$\\mbox{Cov}( \\Delta log(w_{jt}),  \\Delta log(w_{j't}) | J2J)$",
                   'lw_lcw_ee_c'  = "$\\mbox{Cov}(  log(w_{jt}),   log(w_{j't}) | J2J)$"
                   )
  rf <- function(x) {  ifelse( paste(x) %in% names(new_names),  new_names[paste(x)] , paste(x))          }
  dd.m$variable = unlist(sapply( dd.m$variable, rf))