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middle() on affine units #629

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jariji opened this issue Mar 17, 2023 · 4 comments
Open

middle() on affine units #629

jariji opened this issue Mar 17, 2023 · 4 comments
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affine affine quantities like °C, °F, …

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@jariji
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jariji commented Mar 17, 2023 •
edited

Should I be able to do this?

using Statistics
julia> middle(33°F, 35°F)
ERROR: AffineError: an invalid operation was attempted with affine units: °F
@cstjean
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cstjean commented Mar 17, 2023

Yeah, several similar methods are probably necessary #200

@jariji
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jariji commented Mar 17, 2023

I was thinking the solution was to just redefine Statistics.middle(x,y) = (x-y)/2 + y but

julia> (33°F - 32°F)/2  + 32°F
273.4277777777778 K

produces a result in Kelvin instead of Fahrenheit, which I didn't expect.

@cstjean
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cstjean commented Mar 17, 2023 •
edited

We're not super happy with how quickly temperature manipulation becomes all-Kelvin, either. But you can convert it back to Celsius, of course.

@jariji
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jariji commented Mar 18, 2023

Related JuliaStats/Statistics.jl#47

@sostock sostock added the affine affine quantities like °C, °F, … label Mar 22, 2023
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@cstjean @sostock @jariji