# #assert 0.0.pow(9.0) == 0.0
fun pow(e: Float): Float is extern "kernel_Float_Float_pow_1"
- # Returns the logarithm of `self`.
+ # Natural logarithm of `self`.
#
# assert 0.0.log.is_inf == -1
# #assert 1.0.log == 0.0
fun log: Float is extern "kernel_Float_Float_log_0"
+ # Logarithm of `self` to base `base`.
+ #
+ # assert 100.0.log_base(10.0) == 2.0
+ # assert 256.0.log_base(2.0) == 8.0
+ fun log_base(base: Float): Float do return log/base.log
+
# Returns *e* raised to `self`.
fun exp: Float is extern "kernel_Float_Float_exp_0"
# assert -1.34.round == -1.0
# assert -1.67.round == -2.0
fun round: Float is extern "round"
-
+
# Returns a random `Float` in `[0.0 .. self[`.
fun rand: Float is extern "kernel_Float_Float_rand_0"
end
private fun is_inf_extern: Bool is extern "isinf"
+
+ # Linear interpolation between `a` and `b` using `self` as weight
+ #
+ # ~~~
+ # assert 0.0.lerp(0.0, 128.0) == 0.0
+ # assert 0.5.lerp(0.0, 128.0) == 64.0
+ # assert 1.0.lerp(0.0, 128.0) == 128.0
+ # assert -0.5.lerp(0.0, 128.0) == -64.0
+ # ~~~
+ fun lerp(a, b: Float): Float do return (1.0 - self) * a + self * b
end
redef class Collection[ E ]