JuliaApproximation/ApproxFun.jl

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Julia package for function approximation

Stars: 559
Forks: 71
Open beginner issues: 0
Indexed issues: 177

Dominant language: Julia
License: No license data
Last GitHub push: Jun 24, 2026
Latest indexed: Sep 20, 2026
Contributing guide: No contributing guide
Code of conduct: No code of conduct
Beginner labels: No beginner labels indexed
PR merge metrics: No merged PRs in 30d

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177 open issues indexed

Low Rank Operator does not have transpose defined Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

JuliaApproximation/ApproxFun.jl#971 · Opened Dec 10, 2025
How to add Gauge/Tau Method Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

JuliaApproximation/ApproxFun.jl#970 · 3 comments · Opened Dec 8, 2025
cumsum on Laurent space Fun does not work Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

JuliaApproximation/ApproxFun.jl#957 · Opened Jul 11, 2025
Plotting with Makie Open

Difficulty 4/5 3-5 days Newbie friendliness 42/100

JuliaApproximation/ApproxFun.jl#956 · Opened Jun 12, 2025
cumsum error Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

JuliaApproximation/ApproxFun.jl#955 · 6 comments · Opened May 19, 2025
rand fails on PiecewiseSegment domain Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

JuliaApproximation/ApproxFun.jl#952 · Opened Mar 20, 2025
bus error when trying to construct a piecewise discontinuous Fun Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

JuliaApproximation/ApproxFun.jl#951 · Opened Mar 20, 2025
Multiple Integrals give different results Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

JuliaApproximation/ApproxFun.jl#950 · 1 comment · Opened Feb 10, 2025
How to specify integration borders for Integro-Differential equation? Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

JuliaApproximation/ApproxFun.jl#949 · 2 comments · Opened Jan 17, 2025
when x is the identity, f = sign(x) works while g = sign(x) - x fails because arclength is called with invalid signiture Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

JuliaApproximation/ApproxFun.jl#946 · Opened Nov 9, 2024
Remove dependency on Calculus.jl Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

JuliaApproximation/ApproxFun.jl#944 · 1 comment · Opened Oct 20, 2024
Cannot apply multiplication operator on Fourier() space Open

Difficulty 3/5 1-2 days Newbie friendliness 42/100

JuliaApproximation/ApproxFun.jl#941 · Opened Apr 23, 2024
Implementing a convolution operator Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

JuliaApproximation/ApproxFun.jl#940 · 7 comments · Opened Apr 15, 2024
OutOfMemoryError() when approximating a 3D function Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

JuliaApproximation/ApproxFun.jl#938 · Opened Apr 1, 2024
Simple error following the documentation Open

Difficulty 3/5 1-2 days Newbie friendliness 25/100

JuliaApproximation/ApproxFun.jl#936 · 2 comments · Opened Mar 28, 2024
What is the difference between adjoint and a Derivative (newton solver)? Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

JuliaApproximation/ApproxFun.jl#935 · Opened Mar 27, 2024
No DefiniteIntegral() documentation Open

Difficulty 2/5 1-3 hours Newbie friendliness 58/100

JuliaApproximation/ApproxFun.jl#934 · Opened Mar 24, 2024
Are we able to solve this simple sturm liouville problem taken from chebfun examples? Open

Difficulty 5/5 Over a week Newbie friendliness 20/100

JuliaApproximation/ApproxFun.jl#930 · 3 comments · Opened Feb 29, 2024
Cannot use `Integral` in Newton solver Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

JuliaApproximation/ApproxFun.jl#928 · 5 comments · Opened Feb 6, 2024
Multivariate function roots Open

feature

Difficulty 5/5 Over a week Newbie friendliness 25/100

JuliaApproximation/ApproxFun.jl#926 · 12 comments · Opened Dec 20, 2023
Array concatenations produce unexpected results Open

Difficulty 4/5 3-5 days Newbie friendliness 42/100

JuliaApproximation/ApproxFun.jl#924 · 1 comment · Opened Nov 3, 2023
L2 operator Open

Difficulty 5/5 Over a week Newbie friendliness 20/100

JuliaApproximation/ApproxFun.jl#913 · Opened Sep 3, 2023
Division by Fun with root fails: `setdomain(::PiecewiseSpace,::ClosedInterval)` not implement Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

JuliaApproximation/ApproxFun.jl#912 · 1 reaction · Opened Aug 28, 2023
Rounding errors lead to empty domain error when using abs Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

JuliaApproximation/ApproxFun.jl#906 · Opened Aug 18, 2023
Newton for simple PDE gives NaN result Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

JuliaApproximation/ApproxFun.jl#887 · 1 comment · Opened May 28, 2023
Tag v1, write JOSS paper? Open

Difficulty 5/5 Over a week Newbie friendliness 15/100

JuliaApproximation/ApproxFun.jl#871 · 1 comment · Opened Apr 1, 2023
Document about solving Volterra equation (second kind) Open

Difficulty 4/5 3-5 days Newbie friendliness 30/100

JuliaApproximation/ApproxFun.jl#862 · 8 comments · Opened Feb 9, 2023
Precompile fails on binder Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

JuliaApproximation/ApproxFun.jl#856 · 1 comment · Opened Dec 13, 2022
Computing the Zernike polynomials coefficients? Open

Difficulty 4/5 3-5 days Newbie friendliness 30/100

JuliaApproximation/ApproxFun.jl#848 · 1 comment · Opened Dec 1, 2022
Unreasonable number of Chebyshev coefficients required to approximate certain Gaussians Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

JuliaApproximation/ApproxFun.jl#777 · 2 comments · Opened Jun 6, 2022
Null dimensions for matrices not supported ? Open

Difficulty 3/5 1-2 days Newbie friendliness 42/100

JuliaApproximation/ApproxFun.jl#775 · Opened May 19, 2022
How do I limit the number of coefficients used? Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

JuliaApproximation/ApproxFun.jl#774 · 4 comments · Opened May 15, 2022
Solving PDE's on quasi-periodic domains Open

Difficulty 5/5 Over a week Newbie friendliness 20/100

JuliaApproximation/ApproxFun.jl#772 · 3 comments · Opened May 7, 2022
Interface to optimization and AD Open

Difficulty 5/5 Over a week Newbie friendliness 20/100

JuliaApproximation/ApproxFun.jl#765 · Opened Feb 1, 2022
Compatibility with ForwardDiff.Dual Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

JuliaApproximation/ApproxFun.jl#764 · 6 comments · Opened Jan 21, 2022
Operator exponential Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

JuliaApproximation/ApproxFun.jl#763 · 15 comments · Opened Jan 21, 2022
Laplacian symbol Δ is not exported Open

Difficulty 2/5 1-3 hours Newbie friendliness 55/100

JuliaApproximation/ApproxFun.jl#760 · Opened Jan 20, 2022
Circle() displays three o'clock symbol in REPL Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

JuliaApproximation/ApproxFun.jl#757 · 3 comments · Opened Jan 17, 2022
Evaluating at endpoints of open interval Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

JuliaApproximation/ApproxFun.jl#754 · 1 comment · Opened Dec 27, 2021
Support for inner product Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

JuliaApproximation/ApproxFun.jl#753 · 11 comments · Opened Dec 23, 2021
Solving ODE system fails with MethodError depending on interval endpoint Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

JuliaApproximation/ApproxFun.jl#749 · 1 comment · Opened Aug 22, 2021
Error solving nonlinear boundary value problem / worked in a previous version of Julia 111 and Approxfun Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

JuliaApproximation/ApproxFun.jl#747 · 3 comments · Opened Jun 12, 2021
Integration of a function in default and Fourier spaces give incorrect results Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

JuliaApproximation/ApproxFun.jl#746 · 1 comment · Opened May 24, 2021
Spline basis for data interpolation. Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

JuliaApproximation/ApproxFun.jl#744 · 5 comments · 1 reaction · Opened May 15, 2021
Fourier with BigFloat (ERROR: interlace not defined) Open

Difficulty 2/5 1-3 hours Newbie friendliness 25/100

JuliaApproximation/ApproxFun.jl#737 · 1 comment · Opened Mar 18, 2021
Improve use of AF in BifurcationKit Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

JuliaApproximation/ApproxFun.jl#730 · 11 comments · 1 reaction · Opened Jan 12, 2021
Question on Derivative and Conversion on Chebyshev^2 Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

JuliaApproximation/ApproxFun.jl#726 · 4 comments · Opened Dec 11, 2020
Discrepancy in number of points and number of values on tensor spaces Open

Difficulty 4/5 3-5 days Newbie friendliness 30/100

JuliaApproximation/ApproxFun.jl#725 · 5 comments · Opened Dec 11, 2020
ERROR: AssertionError: abs(last(g)) < tol when solving BVP ODE Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

JuliaApproximation/ApproxFun.jl#713 · 6 comments · Opened Sep 3, 2020
Anomalous behavior of transform with Fourier()^2 space Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

JuliaApproximation/ApproxFun.jl#712 · 4 comments · Opened Aug 25, 2020

JuliaApproximation/ApproxFun.jl

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