TeX, LaTeX and Friends

morbusg

6:03 AM

Implementing core typesetting algorithms of TeX as composable functions using Clojure: youtube.com/watch?v=824yVKUPFjU

Enthusiastic Student

8:18 AM

Hi... Is anybody online here?

Joseph Wright

@EnthusiasticStudent Yes :-)

yo'

@EnthusiasticStudent no :-p

Enthusiastic Student

8:34 AM

@JosephWright thanks @yo' :D

I am writing an answer for a question on site

my code is something like this till now:

% pdflatex
\documentclass{standalone}
    \usepackage{siunitx}
    \usepackage{tikz}
    \usepackage{pgfplots}

\begin{document}
\begin{tikzpicture}
       \pgfmathdeclarefunction{q}{2}{\pgfmathparse{(4.9/(#1^2))*(cosh(#1*#2)-cos(#1*#2)}}
\begin{axis}
	\foreach \w in {0.1,0.2,...,1.0} {
	\edef\temp{\noexpand\addlegendentry{\w}}
	\pgfmathparse{100*\w}
	\xdef\x{\pgfmathresult}
	\edef\temp{\noexpand\addplot [red!\x]}\temp{q(\w,x)};
	}
\end{axis}
\end{tikzpicture}
\end{document}

yo'

@EnthusiasticStudent as you see, I and @Joseph are in agreement here :)

Enthusiastic Student

My problem is that I can not see the legend which is added in the iteration.

What should I do?

@yo' We are all in agreement :))

@DavidCarlisle Thanks for your answer here: tex.stackexchange.com/a/238291/52417

David Carlisle

@EnthusiasticStudent don't you want to use the \addlegendentry ? you just use it in the definition of \temp but you redefine \temp to something else before using that definition

Joseph Wright

@EnthusiasticStudent For a start, it's the wrong side of \addplot

David Carlisle

@EnthusiasticStudent as noted in the chat above yesterday it's bound to be better to iterate over 1,2,... and divide by 100 when needed rather than iterate over .1, .2.... which is forced to introduce rounding artefacts as you can not store .1 exactly in a binary system.

Enthusiastic Student

8:42 AM

@DavidCarlisle I want it... Should I bring it in the same temp definition? What is this temp? Sorry my question seems childish I think... :-(

David Carlisle

@EnthusiasticStudent it's just an arbitrary name defined there temp = temporary, but you have essentially \def\foo{a}\def\foo{b}\foo and then ask why you only get b and not a

Joseph Wright

@EnthusiasticStudent For example

\documentclass{standalone}
\usepackage{expl3}
\usepackage{pgfplots}
\ExplSyntaxOn
\cs_new_eq:NN \fpeval \fp_eval:n
\ExplSyntaxOff

\begin{document}
\begin{tikzpicture}
       \pgfmathdeclarefunction{q}{2}{\pgfmathparse{(4.9/(#1^2))*(cosh(#1*#2)-cos(#1*#2)}}
\begin{axis}
	\foreach \w in {10,20,...,100} {
	  \edef\temp{\noexpand\addplot [red!\w]}\temp{q((\w/100),x)};
	  \addlegendentryexpanded{\fpeval{\w/100}}
	}
\end{axis}
\end{tikzpicture}
\end{document}

I've moved the legend after the plot and as @DavidCarlisle suggests done iteration using integers

Or keeping the range for \w

% pdflatex
\documentclass{standalone}
\usepackage{expl3}
\usepackage{pgfplots}
\ExplSyntaxOn
\cs_new_eq:NN \fpeval \fp_eval:n
\ExplSyntaxOff

\begin{document}
\begin{tikzpicture}
       \pgfmathdeclarefunction{q}{2}{\pgfmathparse{(4.9/(#1^2))*(cosh(#1*#2)-cos(#1*#2)}}
\begin{axis}
	\foreach \w in {0.1,0.2,...,1.0} {
	  \edef\temp{\noexpand\addplot [red!\fpeval{100 * \w}]}\temp{q(\w,x)};
	  \addlegendentryexpanded{\fpeval{round(\w,1)}}
	}
\end{axis}
\end{tikzpicture}
\end{document}

@EnthusiasticStudent I've used the LaTeX3 FPU as it's expandable (and doesn't have the rounding issues of the pgf one)

Enthusiastic Student

@DavidCarlisle It does not solve by changing the name of the temp to temp1 and temp2...

David Carlisle

@EnthusiasticStudent not surprising as you can't have digits in command names

Joseph Wright

36

Q: Defining commands/abbreviations that contain numbers

I tend to use \newcommand to define macros for symbols I use often, e.g. \newcommand{\hankel}{H^{(1)}_0}. One inconvenience of this approach is the fact that command names cannot include numbers. What I ideally want is to map something like \H0 to H^{(1)}_0. I imagine this could be done with s...

David Carlisle

8:51 AM

@JosephWright when you have a spare moment you should implement tikz-over-l3 instead of tikz-over-pgf

Enthusiastic Student

@JosephWright Good question... thanks...

Joseph Wright

@DavidCarlisle Is on my list (really: some low-level set of instructions on which picture mode, TikZ or whatever could be set up)

David Carlisle

@JosephWright yes seems like it's inevitable in the end..

Enthusiastic Student

@DavidCarlisle another problem was that I have not closed the first temp by putting a \temp at the end of its statement

David Carlisle

@EnthusiasticStudent as I said, you defined it but never used it (it doesn't matter that you later redefine it with the same name)

@EnthusiasticStudent \def\foo{a}\foo\def\foo{b}\foo works fine and makes ab

yo'

8:55 AM

@DavidCarlisle Is there a way how to define a "transparent" color mycolor so that \color{mycolor} actually doesn't do anything?

David Carlisle

@yo' not really, you can reset the current colour if you know what that is or you can use \iffalse\color{anything}\fi

Enthusiastic Student

@DavidCarlisle can those two legendentry and addplot be defined in the same temp?

yo'

@DavidCarlisle well, the point is that I wanted to simply use a color and let the user re-define it. I'll introduce my own interface :)

David Carlisle

@EnthusiasticStudent yes if you want but why?

Joseph Wright

@EnthusiasticStudent You don't need to force expansion for the legend in this way: see my example where I use \addlegendentryexpanded

Enthusiastic Student

9:01 AM

@DavidCarlisle I think it would be easier for me to understand it...

David Carlisle

@JosephWright no note from Petra about base yet?

Enthusiastic Student

@JosephWright yes...

Joseph Wright

@DavidCarlisle I had a series of e-mails from Manfred Lotz: all seems OK

@DavidCarlisle ctan.org/pkg/latex-base showing correct date

David Carlisle

@JosephWright to you not latex-team I guess: tut tut:-)

Joseph Wright

@DavidCarlisle I'm working through that e-mail 'wall'!

@DavidCarlisle It's not my fault

David Carlisle

9:06 AM

@JosephWright oh no the tutting was to Manfred:-)

Joseph Wright

@DavidCarlisle I didn't check the 'to' on the mails: there were a load!

@DavidCarlisle All of the bits and pieces did get installed

@DavidCarlisle I guess LaTeX will get updated in TL'15 for the first day of pretesting!

Enthusiastic Student

David Carlisle

@JosephWright good! I'm about to vanish for a two day course (starts in 20 minutes:-) so might not be around so much during the day.

Enthusiastic Student

It looks ugly indeed... does not it?

yo'

@EnthusiasticStudent have you considered mixing e.g. red and green to get a gradient?

Enthusiastic Student

9:11 AM

@yo' Like what @DavidCarlisle did in his answer? tex.stackexchange.com/questions/238290/…

yo'

@EnthusiasticStudent prrbly? I dunno :)

and I gotta go, see you later

Enthusiastic Student

@yo' I did... looks better. See you.

@JosephWright can I ask another question? ....

@DavidCarlisle I have another problem with that floating thing...

Everyone got tired of my questions :( have a nice day

Johannes_B

9:28 AM

This question is a bit scary. Even more scary is, that by reading the title i thought: Poison the damn drinking water.

26

Q: What is the least expensive way to annihilate humanity?

Suppose an evil genius (in 2015) wants to kill as much of humanity as possible. But he's on a budget; despite his years of stealing priceless historical artifacts, and despite having been selected for several excessively over-funded research grants, and despite having rigged AAPL value to shoot s...

science-based technology apocalypse humans death

Joseph Wright

@EnthusiasticStudent Yes

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TeX, LaTeX and Friends

$TeX - LaTeX$ TeX, LaTeX and Friends