[英]Running two loops in R for mathematical expression calculation
請看下圖:
gamma <- 1.5
s <- 1
k <- 3
i <- s:k
j <- lapply(i, function(x) 0:x)
prod_i <- sapply(j, function(x) prod(k + gamma - x))
f <- sum(factorial(k) / factorial(k - i) * prod_i)
f
# [1] 637.875
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