Reference · Vectors

vec.ones

vec.ones(int) -> list

What it does

A list of n ints, all 1. Scaled with vec.mul it is a list of any one number, as vec.full(n, x) is directly.

Examples

print(vec.ones(3))print(vec.ones(3) | vec.mul(7))

[1, 1, 1][7, 7, 7]

Edge cases

• vec.ones(0) is the empty list.
• The items are ints: vec.ones(3) == vec.full(3, 1), and not vec.full(3, 1.0).
• At most ten million items.

print(vec.ones(0))print(vec.ones(3) == vec.full(3, 1), vec.ones(3) == vec.full(3, 1.0))

[]true true

Errors

A negative count, or one over ten million, is a runtime error, not an error value; so is a count that is not an int.

print(vec.ones(20000000))

line 1: `vec.ones`: 20000000 is not a count from 0 to 10000000

Chaining

Equal weights for a weighted mean, and a dot product with ones as a plain sum:

let xs = [2, 4, 9]print(vec.dot(xs, vec.ones(3)))print(vec.ones(3) | vec.div(3) | vec.dot(xs))

155.0

See also

vec.zeros, vec.full, vec.mul, vec.dot

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