18 lines
383 B
TypeScript
18 lines
383 B
TypeScript
export function is_object(x) {
|
|
return x !== null && typeof x === "object" && !Array.isArray(x)
|
|
}
|
|
|
|
export function sum(nums) {
|
|
return nums.reduce((s, n) => s + n, 0)
|
|
}
|
|
|
|
export function mean(nums) {
|
|
return sum(nums) / nums.length
|
|
}
|
|
|
|
export function pstdev(nums, mu = null) {
|
|
if (mu === null) {
|
|
mu = mean(nums)
|
|
}
|
|
return Math.sqrt(mean(nums.map((n) => (n - mu) ** 2)))
|
|
}
|