conditionalsmacros
I'm trying to tweak some .cls to fit my needs, and I'd really appreciate it if someone could explain me these statements:
\if@radseminar%
...
\else
...
\fi
If I understand correctly, it will match @radseminartrue, right? How can I use OR statement? For example, I tried
\if{@radtehnicka% or @radseminar%}
but it didn't match either.
It works if you use \expandafter for expanding your macro before \includegraphics is called:
\expandafter\includegraphics\expandafter[\grsmall]{example}
The problem is basically the same as in \ifnum and pgfmath: error I think. \z will not be an integer, so the comparison fails. You can make \z an integer by using \z=int(ceil(abs(sin(\y r)))). int makes it an integer. ceil and abs is necessary to avoid rounding to zero.
\documentclass{article}
\usepackage{tikz,ifthen}
\begin{document}
What I have now:
\begin{tikzpicture}[>=latex]
\draw [thick,dashed] plot [domain=-2*pi:2*pi,samples=100] (\x,{sin(\x r)});
\foreach [evaluate={\y=\x*pi;\z=int(ceil(abs(sin(\y r))));}] \x in {-2,-1.5,...,2} {
\fill (\y,0) circle (1.5pt);
\ifthenelse{\NOT\z=0}{\draw [->,thick] (\y,0) -- +({-sin(\y r)},0);}{};
}
\end{tikzpicture}
What I am trying to achieve:
\begin{tikzpicture}[>=latex]
\draw [thick,dashed] plot [domain=-2*pi:2*pi,samples=100] (\x,{sin(\x r)});
\foreach [evaluate={\y=\x*pi;}] \x in {-1.5,-0.5,...,1.5} {
\fill (\y,0) circle (1.5pt);
\draw [->,thick] (\y,0) -- +({-sin(\y r)},0);
}
\foreach [evaluate={\y=\x*pi;}] \x in {-2,...,2}
\fill (\y,0) circle (1.5pt);
\end{tikzpicture}
\end{document}
Best Answer
There is no macro
\if@… the macro you’re seeing is called\if@radseminar(yes, the@and all that follows is part of the macro name).TeX doesn’t know boolean evaluation. You cannot just join several conditions together like in other programming languages. You need to test the conditions separately by nesting them:
However, there are LaTeX packages to allow this, e.g.
etoolboxorifthen(the latter shouldn’t be used any more I’ve been told).Using
etoolbox, it should look approximately like this: