Trying to use Measurements to differentiate respect to a unitful quantity. about measurements.jl HOT 12 CLOSED

Measurements.derivative.(x^2*y^2+2*x^3*y, [x, y])

That is a weird call, where did you get it?
derivative takes either a single Measurement argument + tag, or two Measurement arguments:

from measurements.jl.

Hi, thanks for the answer. I took the example from here, it is this example:
Measurements.derivative.(log1p(x) + y^2 - cos(x/y), [x, y, z])
Am I interpreting something wrongly?
My objective is to use Measurements.jl as a AD tool for functions that depend on unitful quantities.

from measurements.jl.

Hm, works for me:

$ julia 
               _
   _       _ _(_)_     |  Documentation: https://docs.julialang.org
  (_)     | (_) (_)    |
   _ _   _| |_  __ _   |  Type "?" for help, "]?" for Pkg help.
  | | | | | | |/ _` |  |
  | | |_| | | | (_| |  |  Version 1.9.2 (2023-07-05)
 _/ |\__'_|_|_|\__'_|  |  
|__/                   |

julia> using Measurements

julia> x = 98.1 ± 12.7
98.0 ± 13.0

julia> y = 105.4 ± 25.6
105.0 ± 26.0

julia> z = 78.3 ± 14.1
78.0 ± 14.0

julia> Measurements.derivative(2x - 4y, x)
2.0

julia> Measurements.derivative(2x - 4y, y)
-4.0

julia> Measurements.derivative.(log1p(x) + y^2 - cos(x/y), [x, y, z])
3-element Vector{Float64}:
   0.017700515090289737
 210.7929173496422
   0.0

Perhaps you have too old julia/Measurements package?

from measurements.jl.

As it can be seen in
https://github.com/JuliaPhysics/Measurements.jl/blob/55332725ad6826cef711103de7a2413c3b1b1fd6/ext/MeasurementsUnitfulExt.jl
only the main public interface is unit-aware.

from measurements.jl.

Hi. I do not understand which functions are part of the main public interface and which not. Thanks

from measurements.jl.

Hi. I do not understand what it means.

The error you are getting is correct, Measurements.jl does not support
calling derivative() with an Unitful arguments, only with Measurements.

from measurements.jl.

I thought that measurements could have units, like

x = (98.1 ± 12.7)u"km"
y = (105.4 ± 25.6)*u"km"

Do you say that derivative() only accepts measurements without units?

from measurements.jl.

I thought that measurements could have units, like

x = (98.1 ± 12.7)u"km"
y = (105.4 ± 25.6)*u"km"

Do you say that derivative() only accepts measurements without units?

The thing is that is not a measurement with units,
it's a Measurement-typed value inside of an AbstractUnit-typed value,
and derivative() is missing special-handling to unwrap
the outer AbstractUnit type to get to the actual Measurement inside.

from measurements.jl.

Ok, just to understand, could you give me an example of a "measurement with units" that Measurement.jl understands ?

from measurements.jl.

All normal mathematical operations work, only the functionality that is defined in https://github.com/JuliaPhysics/Measurements.jl/blob/c12fb10d3deef0251d671028dfccb3faa9c880dd/src/utils.jl does not.

from measurements.jl.

#152 kind-of helps,
but i'm not sure yet how to actually deal with unit mismatch in derivative().

from measurements.jl.

Thank you very much

from measurements.jl.