Question

作为Python的初学者，我了解到当你想将一些变量插入到一串文本中时，你会使用

的通用格式

lambda = 3
shape = 6
scale = 2
size = 10000
eps = 1e-8

t = 10

# with probability 1-eps, n or less gamma distributed random variables are needed.
n = qpois(1-eps, lambda = lambda * t)
# sample from the gamma distribution. Not sure if it's ok to use the same sample every time.
# with this, the mean is of by about 10%.
# ys = c(rgamma(n = n, shape = shape, scale = scale))

# the interarrival times are exponentially distributed with rate lambda.
pp.exp = function (t0) {
  # not sure how many Tn are needed :/
  Tn = rexp(1000, lambda)
  Sn = cumsum(Tn)
  return(min(which(Sn > t0)) - 1)
}

# generate N(t) which follow the poisson process.
ns = sapply(1:size, function (i) pp.exp(t))
# generate X(t) as in the problem description.
xs = sapply(ns, function (n) {
  ys = c(rgamma(n = n, shape = shape, scale = scale))
  sum(ys[1:n])
})

它会输出

> # compare mean and variance of 'size' samples of X(t) for verification.
> # sample:
> (mean.s = mean(xs))
[1] 359.864

> (var.s = var(xs))
[1] 4933.277

> # theoretical:
> (mean.t = lambda * t * shape * scale)
[1] 360

> (var.t = (shape + 1) * shape * scale^2)
[1] 168

我通常可以这样做，但我认为我的问题是因为我试图使用％d来插入数字的向量/数组而不是单个项目。

请参阅下面我正在尝试运行的完整代码，但它不起作用！

"Blah blah blah %d" % some_variable

我想知道是否需要使用不同的％运算符？或者也许这是不可能的，因为它确实是一个载体？

Answer 1

%s可用于表示任何数据。将调用str将对象转换为字符串。

您还应该在元组中包含多个项目。把它们放在一起：

print "The mean is of %s is %d" % (array, statistics.mean(array))

如何使用％d将数组插入文本字符串？

1 个答案: