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I use a minimal code example with Julia

\documentclass{article}

\usepackage[cache=false]{minted}

\begin{document}
\inputminted{julia}{polynomial_regression.jl}
\end{document}

on

# Polynomial Features ϕ = [1,x,x²,x³,...,xⁿ]' of Degree n
ϕ(x,n) = (x' .^ collect(range(0, stop=n, length=(n+1))))';

function polynomial_regression(x,y,xq,n)   
   𝚽  = ϕ(x,n); # Training data

   # Linear Regression 
   θ = inv(𝚽'*𝚽)*𝚽'*y;  

   # Predict Query Data
   yp = ϕ(xq,n)*θ;

   return(yp);
end;

I get a

./Example-minimal.out.pyg:2: Package inputenc Error:    Unicode character Ï (U+3D5)
(inputenc)                not set up for use with LaTeX.

See the inputenc package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              

l.2 ...1,x,x²,x³,...,xâ¿]\PYGZsq{} of Degree n}
  • Welcome. Did you do a search in the forum to "Package inputenc Error: Unicode character"? There are numerous similar problems, probably they will give a solution. – albert Nov 6 '18 at 11:02
  • 2
    Hm. You should perhaps consider to use xelatex or lualatex if you want to use so much unicode. And you probably will have to use some other font inside the listing, see e.g. tex.stackexchange.com/a/100621/2388. – Ulrike Fischer Nov 6 '18 at 11:08
  • Ulrike Fischer is right, and I’d recommend unicode-math. If for some reason you cannot use it, alphabeta might work for you. – Davislor Jan 30 at 1:56
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The best solution that I could determine was manually defining all missing characters by

\DeclareUnicodeCharacter{3B4}{$\bm{\delta}$}
\DeclareUnicodeCharacter{3B8}{$\bm{\theta}$}
\DeclareUnicodeCharacter{3BB}{$\lambda$}
\DeclareUnicodeCharacter{3BC}{$\mu$}
\DeclareUnicodeCharacter{3BC}{$\pi$}
\DeclareUnicodeCharacter{3C3}{$\sigma$}
\DeclareUnicodeCharacter{3C0}{$\pi$}
\DeclareUnicodeCharacter{3D5}{$\bm{\phi}$}

until it shows no more errors. If anyone knows a more elegant approach, please add it!

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