[Tex/LaTex] Why using \mathrm still gives italic text

amsmathitalicmath-mode

I'm writing an equation using the displaymath environment, and I'd like to have the units in non-italic. So I use \mathrm{}, and I write this:

\begin{displaymath}
P_{AVG}=19.5 + \frac{2180}{5 \cdot 60 + 0.2} = 26.77~\mathrm{\mu}W
\end{displaymath}

But the units remain italic:

enter image description here

I tried to use the 'amsmath' package, but the problem remains. What am I doing wrong?

I'm using the book class in pdflatex:
\documentclass[12pt, a4paper, titlepage, twoside, openright]{book}

EDIT: it took me a while to realize that the W was outside the \mathrm block, but the solutions are both very good.

Best Answer

This is my suggestion:

\documentclass{article}
\usepackage{amsmath}
\usepackage{siunitx}
\begin{document}

\begin{equation*}
P_{\text{AVG}} = \SI{19.5}{\micro\watt} + \frac{\SI{2180}{\micro\joule}}{5 \cdot \SI{60}{\second} + \SI{0.2}{\second}} = \SI{26.77}{\micro\watt}
\end{equation*}

\end{document}

enter image description here

(By loading the amsmath package, I can use text to typeset the "AVG" subscript in roman)

Related Solutions

[Tex/LaTex] Using bold/italic text inside listings

As per Mico's answer, there is no boldfaced monospaced font in the Computer Modern font family, so you need to use a font that has bold monospaced font. Below is an example using listings that make the keywords bold using the pxfonts. Here is a comparison of the results without and with the \usepackage{pxfonts}:

enter image description here

\documentclass[border=2pt]{standalone}
\usepackage{listings}
\usepackage{pxfonts}

\lstset{language=C,
    basicstyle=\ttfamily,
    keywordstyle=\bfseries,
    showstringspaces=false,
    morekeywords={include, printf}
}

\begin{document}
\begin{lstlisting}
    /* Prints Hello World */

    #include <stdio.h>
    
    int main(void) {
       printf("Hello World!");
       return 0;
    }
\end{lstlisting}
\end{document}

Alternate Solution:

You could also use the the courier font form ttfamily with bfseries or how to enable bold in fixed width font:

enter image description here

\documentclass[border=2pt]{standalone}
\usepackage{listings}

\lstset{language=C,
    basicstyle=\ttfamily,
    keywordstyle=\bfseries,
    showstringspaces=false,
    morekeywords={include, printf}
}

\begin{document}
\begin{lstlisting}
    /* Prints Hello World */

    #include <stdio.h>
    
    int main(void) {
       printf("Hello World!");
       return 0;
    }
\end{lstlisting}

\hrule
\renewcommand{\ttdefault}{pcr}
\begin{lstlisting}
    /* Prints Hello World */

    #include <stdio.h>
    
    int main(void) {
       printf("Hello World!");
       return 0;
    }
\end{lstlisting}
\end{document}

[Tex/LaTex] Why does \mathrm{\varphi} work, but \text{\varphi} does not

\varphi is a math symbol and requires math mode. Since \mathrm still "provides" math mode, \varphi doesn't complain. On the other hand, \text (from amstext; loaded by amsmath) is a macro that makes the correct choice in font size when switching to text mode - super convenient when typesetting test in exponents/subscripts. However, it still switches to text mode.

If you which to use \varphi in text mode without having to switch to math mode explicitly, use something like

\newcommand{\textphi}{\ensuremath{\varphi}}

which will allow you to use \textphi in either text or math mode. The \ensuremath conditional switches to math mode only when necessary (when you're in text mode, say).

enter image description here

\documentclass{article}
\newcommand{\textphi}{\ensuremath{\varphi}}
\begin{document}
$\varphi^\varphi\ \textphi^\textphi$\ \textphi\textsuperscript{\textphi}
\end{document}

Best Answer

Related Solutions

[Tex/LaTex] Using bold/italic text inside listings

Alternate Solution:

[Tex/LaTex] Why does \mathrm{\varphi} work, but \text{\varphi} does not

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