防止逗号在R中的expression()中开始新行

# 创建一个包含逗号的expression()
expr <- expression(
  a = 1,
  b = 2,
  c = 3,
  d = 4,
  e = 5,
  f = 6,
  g = 7,
  h = 8,
  i = 9,
  j = 10,
  k = 11,
  l = 12,
  m = 13,
  n = 14,
  o = 15,
  p = 16,
  q = 17,
  r = 18,
  s = 19,
  t = 20,
  u = 21,
  v = 22,
  w = 23,
  x = 24,
  y = 25,
  z = 26
)

# 打印expression()
print(expr)

a = 1, b = 2, c = 3, d = 4, e = 5, f = 6, g = 7, h = 8, i = 9, j = 10, k = 11, l = 12, m = 13, n = 14, o = 15, p = 16, q = 17, r = 18, s = 19, t = 20, u = 21, v = 22, w = 23, x = 24, y = 25, z = 26