I would like my subscript y_{ij} in bold. I used:
\usepackage[fleqn]{amsmath}
\begin{document}
\bf{y}_{ij}
\end{document}
or
\mathbf{y}_{ij}
but really nothing happens. Only y is in bold.
Can anyone help me please?
Best
[Tex/LaTex] Bold subscripts
bold
Related Solutions
As a last resort, over-printing (or under-printing) as a method to simulate boldness (or fake bold) is an option using the contour package. It may come in handy when there is no bold version of a font/symbol available:
\documentclass{article}
\usepackage{mathptmx}% http://ctan.org/pkg/mathptmx
\usepackage{array,contour}% http://ctan.org/pkg/{array,contour}
\begin{document}
\begin{tabular}{rl@{\quad}>{\contourlength{0.01em}}l}
\verb|\sigma|: & $\sigma$ & $\sigma$ \\
\verb|\contour[1]{red}{$\sigma$}|: & \contour[1]{red}{$\sigma$} & \contour[1]{red}{$\sigma$} \\
\verb|\contour[10]{black}{$\sigma$}|: & \contour[10]{black}{$\sigma$} & \contour[10]{black}{$\sigma$} \\
\verb|\contour{black}{$\sigma$}|: & \contour{black}{$\sigma$} & \contour{black}{$\sigma$} \\
\verb|\contour*{black}{$\sigma$}|: & \contour*{black}{$\sigma$} & \contour*{black}{$\sigma$}
\end{tabular}
\end{document}
The default interface is \contour[<number>]{<color>}{<stuff>} that prints <number> copies of <stuff> under <stuff> using colour <color>. The default is 16 repetitions if none are specified, while the starred-version \contour* prints 32. \contourlength{<len>} sets the radius of the under-printing. The two column above are default (0.03em) and 0.01em.
To make the under-printing more obvious/clear, here's a close-up view of the above contours at the default setting:
And, for \contourlength{0.01em}:
The problem is that computer modern has no boldface typewriter font. So you have to choose a font family like lmodern.
\usepackage{lmodern}
To increase the contrast between boldface and normal, you can choose the lightweight series.
\ttfamily\fontseries{l}\selectfont
As noted by Werner in the comments, after switching the font it is not necessary to modify the keywords, as they are typeset in boldface anyway (see the code below).
\documentclass{article}
\usepackage[ruled]{algorithm}
\usepackage[]{algorithmicx}
\usepackage[noend]{algpseudocode}
\let\oldalgorithmic\algorithmic
\renewcommand\algorithmic{\ttfamily\fontseries{l}\selectfont\oldalgorithmic}
\usepackage{lmodern}
\begin{document}
\begin{algorithm}[H]
\caption{Gaussian sampler using Taylor series}
\begin{algorithmic}
\State sigma $\gets 8 / \sqrt{2 \pi}$
\State variance $\gets$ sigma$^2$
\State \Comment{returns pdf(x) = standard Gaussian pdf}
\Function{pdf}{x}
\Return $e^{(-x^2 / 2)} / \sqrt{2 \pi}$
\EndFunction
\State \Comment{returns CDF(z) = standard Gaussian CDF using Taylor approximation}
\Function{cdf}{x}
\If{x $<$ -variance}
\Return 0.0
\ElsIf{x $>$ variance}
\Return 1.0
\EndIf
\EndFunction
\end{algorithmic}
\end{algorithm}
\end{document}
Best Answer
The context is not very clear to me: math formula with bold symbols, math formula in bold context like section titles, bold/italics or bold/upright, text mode, ...
Here some variations: