I am trying to understand what happens when I subtract a Float32 from a Float64 where the numbers are “very small”. I understand what happens when both are Float64 julia> 1.401298464324817e-45 - 1.0e-45 4.012984643248171e-46 but if the second number is Float32 I get zero julia> 1.401298464324817…

[image] DNF: What happened? Actually 1.0f-45 is not 1.00000000000f-45 but rather julia> big(1.0f-45) 1.401298464324817070923729583289916131280261941876515771757068283889791082685861e-45 In particular, 1.0f-45 is internally rounded to a “subnormal” Float32 value that effectively has only a si…

Subtract Float32 number from Float64 number - what's the rule?

New to Julia

Sukera August 29, 2023, 10:58am 3

See also

Topic		Replies	Views
Quick probably basic question on Floats General Usage question , float	5	875	August 2, 2020
Slowdown due to subnormal float, coming from neural net training Performance	20	888	October 27, 2022
50x speed difference in gemv for different values in vector General Usage	8	4976	August 16, 2017
PSA: floating-point arithmetic Offtopic	14	7556	July 8, 2021
Float32 performance fluctuating over time Performance	1	300	October 22, 2021

Subtract Float32 number from Float64 number - what's the rule?

Related topics