Comments (5)
MikaelSlevinsky
commented on June 25, 2024
What about sum(u)?
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eschnett
commented on June 25, 2024
sum(u) works.
Is this how the definite integral should be calculated?
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jishnub
commented on June 25, 2024
Yes, I believe this comes from Chebfun
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MikaelSlevinsky
commented on June 25, 2024
It's in some sense just a synonym for DefiniteIntegral, but in this case the overrides for the autodiff live here https://github.com/JuliaApproximation/ApproxFun.jl/blob/master/src/Extras/autodifferentiation.jl, and this shows that sum, cumsum and integrate are more probably convenient.
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dlfivefifty
commented on June 25, 2024
I agree it's a confusing pun. An other confusing pun is conflating operators (which should be linear functions of functions) and multiplication.
The idea behind ContinuumArrays.jl/ClassicalOrthogonalPolynomials.jl was to separate the idea of "functions as vectors" and "functions as functions". The long term plan is to make ApproxFun.jl sit on top of these other projects and make a concrete distinction between these two languages. Unfortunately ApproxFun has a lot of features so it is taking a lot of time to realise this.
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Related Issues (20)
- Precompile fails on binder HOT 1
- Domain properties of functions not consistent HOT 2
- Document about solving Volterra equation (second kind) HOT 8
- Trouble with the Fourier representaion of a constant matrix with trailing zero element HOT 2
- Tag v1, write JOSS paper? HOT 1
- WARNING: both ApproxFunFourier and DomainSets export "Disk"; uses of it in module ApproxFun must be qualified HOT 1
- An issue with the built-in solver using ultraspherical spectral method
- Add the option to specify the number of coefficients HOT 2
- Newton for simple PDE gives NaN result HOT 1
- Cumsum fails when used on the output of sign()
- Rounding errors lead to empty domain error when using abs
- Changing operand order causes incorrect calculation of the infinity norm
- Creating a Fun of tanh returns the zero Fun HOT 2
- Division by Fun with root fails: `setdomain(::PiecewiseSpace,::ClosedInterval)` not implement
- L2 operator
- typos HOT 1
- Array concatenations produce unexpected results HOT 1
- Multivariate function roots HOT 12
- Wrong tensor product between Fourier and Chebyshev HOT 1
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