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Assessment

Difficulty
4/5
Estimated time
3-5 days
Newbie friendliness
25/100
Issue type
Bug
Clarity
Needs clarification
Activity status
Stale
Tech stack
julia
Domain
performance

Research direction

The issue names no files or tests. Start by reproducing the Julia REPL example with Polynomial and ImmutablePolynomial, then trace the multiplication paths involved and determine what behavior or numerical difference should be considered correct.

Written by the indexing model from the issue text.

Description

This polynomial shows that multiplication for different polynomial types can vary significantly:

julia> rts = [1.0, sqrt(2), sqrt(3)];

julia> ls = [2, 3, 4];

julia> x, xx = variable(Polynomial{Float64}), variable(ImmutablePolynomial{Float64});

julia> pp = prod((xx-z)^l for (z,l) in zip(rts, ls));

julia> p = prod((x-z)^l for (z,l) in zip(rts, ls));

julia> maximum(abs, coeffs(pp*pp) .- coeffs(p*p))
2.3283064365386963e-10
Dominant language
Julia
Stars
321
Forks
81
Avg merge
10h 1m
Merged PRs (30d)
5

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