[Tex/LaTex] How to display Unicode characters with minted

input-encodingsmintedpdftexunicode

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}

Best Answer

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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