Is there a function in Base Julia to get the decimal part of a number? I feel like I’ve seen that function before, but now I can’t find it. For example, I would like the following: julia> x = 12.345; julia> foo(x) 0.345 Granted, I can get an approximation to that behavior, but I’m looking for a b…

The ‘modf’ function returns a tuple containing fractional and integer parts of a number. Maybe that could be useful to you?

This isn’t floating point wonkiness. This is just that 1.3 != 13//10 The exact value of 1.3 - 1 is 0.30000000000000004.

[image] CameronBieganek: julia> x = 1.3 1.3 Realize that Julia isn’t printing all of the digits here, just the smallest number of digits that rounds to the same value (because 1.3 isn’t exactly represented in binary floating point). If you print all of the digits you see: julia> big(1.3) 1…

[image] Oscar_Smith: This isn’t floating point wonkiness. By “floating point wonkiness”, I mean floating point numbers behaving correctly but counter-intuitively. Obviously floating point numbers in Julia conform to the IEEE standard. I thought I had once used the hypothetical function menti…

Not for negative numbers. julia> let xs=(3.14, -3.14); modf.(xs) end ((0.14000000000000012, 3.0), (-0.14000000000000012, -3.0)) julia> let xs=(3.14, -3.14); mod.(xs, 1) end (0.14000000000000012, 0.8599999999999999) However, mod(x, sign(x)) works: julia> let xs=(3.14, -3.14); mod.(xs, sign.(xs)) …

Get the decimal part of a number

General Usage

stevengj March 22, 2022, 3:44pm 4

See also PSA: floating-point arithmetic

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Get the decimal part of a number

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