The follwing LaTex lines don't print out what I hope to see:
calculate $\rho_i^{t} = \| \mathcal{w}_{i}^{t} - \mathcal{w}_{i}^{t-1} \|_2$
what I get instead of the two w is that:
Can anyone help me please?
Thank you!
That's because the font does not have lowercase characters. This is also documented in the TeXbook (in plain TeX you get the effect of \mathcal using \cal).
For example, β
$\cal A$β produces βπβ and β$\cal Z$β produces βπ΅β. But beware: This works only with the lettersAtoZ; you'll get weird results if you apply\calto lowercase or Greek letters.
As you can see from the symbols table below, there are other characters encoded in the slots where lowercase usually is (w maps to slot 119).
That being said, some Unicode math fonts have a lowercase script alphabet, e.g. XITS Math. The Unicode version of Latin Modern unfortunately does not have a lowercase script alphabet.
\documentclass{article}
\usepackage{unicode-math}
\setmathfont{XITS Math}
\begin{document}
$\rho_i^{t} = \| \mathscr{w}_{i}^{t} - \mathscr{w}_{i}^{t-1} \|_2$
\end{document}
answered Apr 24 '18 at 6:28
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Wonderful, thank you. I used now \mathit{w}. Looks also pretty satisfactorily. – Felix Laumann Apr 24 '18 at 6:42
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3@FelixLaumann Instead of
\mathit{w}you can also just use plainw. The font should be the same. The only difference is that\mathitenables character kerning (compare\mathit{ff}andff), i.e. it is to be used for actual words. – Henri Menke Apr 24 '18 at 6:46 -
3@HenriMenke or rather
\mathitis wrong, it uses the text italic font (so multi-letter identifiers work) w on its own will use math italic (which typically has wider sidebearings, and potentially different character shapes) – David Carlisle Apr 24 '18 at 7:08
\documentclassand ending with\end{document}. – Bobyandbob Apr 24 '18 at 7:04